Show line number for some warning and error message.

Added option to disable default vertex colors

README.md

@@ -98,6 +98,7 @@ TinyObjLoader is successfully used in ...
 * PBR material extension for .MTL. Its proposed here: http://exocortex.com/blog/extending_wavefront_mtl_to_support_pbr
 * Callback API for custom loading.
 * Double precision support(for HPC application).
+* Smoothing group
 
 
 ## TODO
@@ -105,8 +106,6 @@ TinyObjLoader is successfully used in ...
 * [ ] Fix obj_sticker example.
 * [ ] More unit test codes.
 * [x] Texture options
-* [ ] Normal vector generation
-  * [ ] Support smoothing groups
 
 ## License
 

examples/callback_api/main.cc

@@ -129,6 +129,7 @@ int main(int argc, char **argv) {
   cb.object_cb = object_cb;
 
   MyMesh mesh;
+  std::string warn;
   std::string err;
   std::string filename = "../../models/cornell_box.obj";
   if (argc > 1) {
@@ -143,7 +144,11 @@ int main(int argc, char **argv) {
 
   tinyobj::MaterialFileReader mtlReader("../../models/");
 
-  bool ret = tinyobj::LoadObjWithCallback(ifs, cb, &mesh, &mtlReader, &err);
+  bool ret = tinyobj::LoadObjWithCallback(ifs, cb, &mesh, &mtlReader, &warn, &err);
+
+  if (!warn.empty()) {
+    std::cout << "WARN: " << warn << std::endl;
+  }
 
   if (!err.empty()) {
     std::cerr << err << std::endl;

examples/obj_sticher/obj_sticher.cc

@@ -1,9 +1,10 @@
 //
 // Stiches multiple .obj files into one .obj.
 //
-#include "../../tiny_obj_loader.h"
 #include "obj_writer.h"
 
+#include "../../tiny_obj_loader.h"
+
 #include <cassert>
 #include <iostream>
 #include <cstdlib>
@@ -11,27 +12,59 @@
 
 typedef std::vector<tinyobj::shape_t> Shape;
 typedef std::vector<tinyobj::material_t> Material;
+typedef tinyobj::attrib_t Attribute;
 
 void
 StichObjs(
+  tinyobj::attrib_t& out_attribute,
   std::vector<tinyobj::shape_t>& out_shape,
   std::vector<tinyobj::material_t>& out_material,
+  const std::vector<Attribute>& attributes,
   const std::vector<Shape>& shapes,
   const std::vector<Material>& materials)
 {
-  int numShapes = 0;
+  // The amount of attributes, shape-vectors and material-vecotrs should be the same.
-  for (size_t i = 0; i < shapes.size(); i++) {
+  if(attributes.size() != shapes.size() && attributes.size() != materials.size()){
-    numShapes += (int)shapes[i].size();
+    std::cerr << "Size of attributes, shapes and Materials don't fit!" << attributes.size() << " " << shapes.size() <<" " << materials.size() << std::endl;;
+    exit(1);
+  }
+  int num_shapes = 0;
+  // 4 values (vertices, normals, texcoords, colors)
+  std::vector<int> num_attributes(4, 0);
+  int num_materials = 0;
+  for(int i = 0; i < shapes.size(); i++){
+    num_shapes += shapes[i].size();
+  }
+  for(int i = 0; i < attributes.size(); i++){
+    num_attributes[0] += attributes[i].vertices.size();
+    num_attributes[1] += attributes[i].normals.size();
+    num_attributes[2] += attributes[i].texcoords.size();
+    num_attributes[3] += attributes[i].colors.size();
+  }
+  for(int i = 0; i < materials.size(); i++){
+    num_materials += materials[i].size();
   }
 
-  printf("Total # of shapes = %d\n", numShapes);
+  // More performant, than push_back
-  int materialIdOffset = 0;
+  out_attribute.vertices.resize(num_attributes[0]);
+  out_attribute.normals.resize(num_attributes[1]);
+  out_attribute.texcoords.resize(num_attributes[2]);
+  out_attribute.colors.resize(num_attributes[3]);
+  out_shape.resize(num_shapes);
+  out_material.resize(num_materials);
 
-  size_t face_offset = 0;
+  int material_id_offset = 0;
+  int shape_id_offset = 0;
+  int vertex_idx_offset = 0;
+  int normal_idx_offset = 0;
+  int texcoord_idx_offset = 0;
+  int color_idx_offset = 0;
+
+  // shapes.size() = attributes.size() = materials.size()
   for (size_t i = 0; i < shapes.size(); i++) {
 
+    // Copy shapes
     for (size_t k = 0; k < shapes[i].size(); k++) {
-
       std::string new_name = shapes[i][k].name;
       // Add suffix
       char buf[1024];
@@ -39,36 +72,51 @@ StichObjs(
       new_name += std::string(buf);
 
       printf("shape[%ld][%ld].name = %s\n", i, k, shapes[i][k].name.c_str());
-      assert((shapes[i][k].mesh.indices.size() % 3) == 0);
-      assert((shapes[i][k].mesh.positions.size() % 3) == 0);
 
       tinyobj::shape_t new_shape = shapes[i][k];
-      // Add offset.
+      // Add material offset.
-      for (size_t f = 0; f < new_shape.mesh.material_ids.size(); f++) {
+      for(size_t f = 0; f < new_shape.mesh.material_ids.size(); f++) {
-        new_shape.mesh.material_ids[f] += materialIdOffset;
+        new_shape.mesh.material_ids[f] += material_id_offset;
+      }
+      // Add indices offset.
+      for(size_t f = 0; f < new_shape.mesh.indices.size(); f++){
+        tinyobj::index_t& ref = new_shape.mesh.indices[f];
+        if(ref.vertex_index > -1){
+          ref.vertex_index += vertex_idx_offset;
+        }
+        if(ref.normal_index > -1){
+          ref.normal_index += normal_idx_offset;
+        }
+        if(ref.texcoord_index > -1){
+          ref.texcoord_index += texcoord_idx_offset;
+        }
       }
 
       new_shape.name = new_name;
       printf("shape[%ld][%ld].new_name = %s\n", i, k, new_shape.name.c_str());
 
-      out_shape.push_back(new_shape);
+      out_shape[shape_id_offset++] = new_shape;
     }
 
-    materialIdOffset += materials[i].size();
+    // Copy materials
-  }
-
-  for (size_t i = 0; i < materials.size(); i++) {
     for (size_t k = 0; k < materials[i].size(); k++) {
-      out_material.push_back(materials[i][k]);
+      out_material[material_id_offset++] = materials[i][k];
-    }
     }
 
+    // Copy attributes (3 floats per vertex, 3 floats per normal, 2 floats per texture-coordinate, 3 floats per color)
+    // You could also include a check here, if the sizes are dividable by 3 (resp. 2), but it's safe to simply assume, they do.
+    std::copy(attributes[i].vertices.begin(), attributes[i].vertices.end(), out_attribute.vertices.begin() + vertex_idx_offset * 3);
+    vertex_idx_offset += attributes[i].vertices.size() / 3;
+    std::copy(attributes[i].normals.begin(), attributes[i].normals.end(), out_attribute.normals.begin() + normal_idx_offset * 3);
+    normal_idx_offset += attributes[i].normals.size() / 3;
+    std::copy(attributes[i].texcoords.begin(), attributes[i].texcoords.end(), out_attribute.texcoords.begin() + texcoord_idx_offset * 2);
+    texcoord_idx_offset += attributes[i].texcoords.size() / 2;
+    std::copy(attributes[i].colors.begin(), attributes[i].colors.end(), out_attribute.colors.begin() + color_idx_offset);
+    color_idx_offset += attributes[i].colors.size();
+  }
 }
 
-int
+int main(int argc, char **argv)
-main(
-  int argc,
-  char **argv)
 {
   if (argc < 3) {
     printf("Usage: obj_sticher input0.obj input1.obj ... output.obj\n");
@@ -78,16 +126,16 @@ main(
   int num_objfiles = argc - 2;
   std::string out_filename = std::string(argv[argc-1]); // last element
 
-  std::vector<Shape> shapes;
+  std::vector<Attribute> attributes(num_objfiles);
-  std::vector<Material> materials;
+  std::vector<Shape> shapes(num_objfiles);
-  shapes.resize(num_objfiles);
+  std::vector<Material> materials(num_objfiles);
-  materials.resize(num_objfiles);
 
   for (int i = 0; i < num_objfiles; i++) {
     std::cout << "Loading " << argv[i+1] << " ... " << std::flush;
     
+    std::string warn;
     std::string err;
-    bool ret = tinyobj::LoadObj(shapes[i], materials[i], err, argv[i+1]);
+    bool ret = tinyobj::LoadObj(&attributes[i], &shapes[i], &materials[i], &warn, &err, argv[i+1]);
     if (!err.empty()) {
       std::cerr << err << std::endl;
     }
@@ -98,12 +146,13 @@ main(
     std::cout << "DONE." << std::endl;
   }
 
-  std::vector<tinyobj::shape_t> out_shape;
+  Attribute out_attribute;
-  std::vector<tinyobj::material_t> out_material;
+  Shape out_shape;
-  StichObjs(out_shape, out_material, shapes, materials);
+  Material out_material;
+  StichObjs(out_attribute, out_shape, out_material, attributes, shapes, materials);
 
   bool coordTransform = true;
-  bool ret = WriteObj(out_filename, out_shape, out_material, coordTransform);
+  bool ret = WriteObj(out_filename, out_attribute, out_shape, out_material, coordTransform);
   assert(ret);
 
   return 0;

examples/obj_sticher/obj_writer.cc

@@ -30,6 +30,8 @@ bool WriteMat(const std::string& filename, const std::vector<tinyobj::material_t
     fprintf(fp, "Ke %f %f %f\n", mat.emission[0], mat.emission[1], mat.emission[2]);
     fprintf(fp, "Ns %f\n", mat.shininess);
     fprintf(fp, "Ni %f\n", mat.ior);
+    fprintf(fp, "illum %d\n", mat.illum);
+    fprintf(fp, "\n");
     // @todo { texture }
   }
   
@@ -38,7 +40,7 @@ bool WriteMat(const std::string& filename, const std::vector<tinyobj::material_t
   return true;
 }
 
-bool WriteObj(const std::string& filename, const std::vector<tinyobj::shape_t>& shapes, const std::vector<tinyobj::material_t>& materials, bool coordTransform) {
+bool WriteObj(const std::string& filename, const tinyobj::attrib_t& attributes, const std::vector<tinyobj::shape_t>& shapes, const std::vector<tinyobj::material_t>& materials, bool coordTransform) {
   FILE* fp = fopen(filename.c_str(), "w");
   if (!fp) {
     fprintf(stderr, "Failed to open file [ %s ] for write.\n", filename.c_str());
@@ -48,17 +50,53 @@ bool WriteObj(const std::string& filename, const std::vector<tinyobj::shape_t>&
   std::string basename = GetFileBasename(filename);
   std::string material_filename = basename + ".mtl";
 
-  int v_offset = 0;
-  int vn_offset = 0;
-  int vt_offset = 0;
   int prev_material_id = -1;
 
-  fprintf(fp, "mtllib %s\n", material_filename.c_str());
+  fprintf(fp, "mtllib %s\n\n", material_filename.c_str());
+
+  // facevarying vtx
+  for (size_t k = 0; k < attributes.vertices.size(); k+=3) {
+    if (coordTransform) {
+      fprintf(fp, "v %f %f %f\n",
+        attributes.vertices[k + 0],
+        attributes.vertices[k + 2],
+        -attributes.vertices[k + 1]);
+    } else {
+      fprintf(fp, "v %f %f %f\n",
+        attributes.vertices[k + 0],
+        attributes.vertices[k + 1],
+        attributes.vertices[k + 2]);
+    }
+  }
+
+  fprintf(fp, "\n");
+
+  // facevarying normal
+  for (size_t k = 0; k < attributes.normals.size(); k += 3) {
+    if (coordTransform) {
+      fprintf(fp, "vn %f %f %f\n",
+        attributes.normals[k + 0],
+        attributes.normals[k + 2],
+        -attributes.normals[k + 1]);
+    } else {
+      fprintf(fp, "vn %f %f %f\n",
+        attributes.normals[k + 0],
+        attributes.normals[k + 1],
+        attributes.normals[k + 2]);
+    }
+  }
+
+  fprintf(fp, "\n");
+
+  // facevarying texcoord
+  for (size_t k = 0; k < attributes.texcoords.size(); k += 2) {
+    fprintf(fp, "vt %f %f\n",
+      attributes.texcoords[k + 0],
+      attributes.texcoords[k + 1]);
+  }
 
   for (size_t i = 0; i < shapes.size(); i++) {
-
+    fprintf(fp, "\n");
-    bool has_vn = false;
-    bool has_vt = false;
 
     if (shapes[i].name.empty()) {
       fprintf(fp, "g Unknown\n");
@@ -66,101 +104,53 @@ bool WriteObj(const std::string& filename, const std::vector<tinyobj::shape_t>&
       fprintf(fp, "g %s\n", shapes[i].name.c_str());
     }
 
-    //if (!shapes[i].material.name.empty()) {
+    bool has_vn = false;
-    //  fprintf(fp, "usemtl %s\n", shapes[i].material.name.c_str());
+    bool has_vt = false;
-    //}
+    // Assumes normals and textures are set shape-wise.
-
+    if(shapes[i].mesh.indices.size() > 0){
-    // facevarying vtx
+      has_vn = shapes[i].mesh.indices[0].normal_index != -1;
-    for (size_t k = 0; k < shapes[i].mesh.indices.size() / 3; k++) {
+      has_vt = shapes[i].mesh.indices[0].texcoord_index != -1;
-      for (int j = 0; j < 3; j++) {
-        int idx = shapes[i].mesh.indices[3*k+j];
-        if (coordTransform) {
-          fprintf(fp, "v %f %f %f\n",
-            shapes[i].mesh.positions[3*idx+0],
-            shapes[i].mesh.positions[3*idx+2],
-            -shapes[i].mesh.positions[3*idx+1]);
-        } else {
-          fprintf(fp, "v %f %f %f\n",
-            shapes[i].mesh.positions[3*idx+0],
-            shapes[i].mesh.positions[3*idx+1],
-            shapes[i].mesh.positions[3*idx+2]);
     }
-      }
-    }
-
-    // facevarying normal
-    if (shapes[i].mesh.normals.size() > 0) {
-      for (size_t k = 0; k < shapes[i].mesh.indices.size() / 3; k++) {
-        for (int j = 0; j < 3; j++) {
-          int idx = shapes[i].mesh.indices[3*k+j];
-          if (coordTransform) {
-            fprintf(fp, "vn %f %f %f\n",
-              shapes[i].mesh.normals[3*idx+0],
-              shapes[i].mesh.normals[3*idx+2],
-              -shapes[i].mesh.normals[3*idx+1]);
-          } else {
-            fprintf(fp, "vn %f %f %f\n",
-              shapes[i].mesh.normals[3*idx+0],
-              shapes[i].mesh.normals[3*idx+1],
-              shapes[i].mesh.normals[3*idx+2]);
-          }
-        }
-      }
-    }
-    if (shapes[i].mesh.normals.size() > 0) has_vn = true;
-
-    // facevarying texcoord
-    if (shapes[i].mesh.texcoords.size() > 0) {
-      for (size_t k = 0; k < shapes[i].mesh.indices.size() / 3; k++) {
-        for (int j = 0; j < 3; j++) {
-          int idx = shapes[i].mesh.indices[3*k+j];
-          fprintf(fp, "vt %f %f\n",
-            shapes[i].mesh.texcoords[2*idx+0],
-            shapes[i].mesh.texcoords[2*idx+1]);
-        }
-      }
-    }
-    if (shapes[i].mesh.texcoords.size() > 0) has_vt = true;
 
     // face
-    for (size_t k = 0; k < shapes[i].mesh.indices.size() / 3; k++) {
+    int face_index = 0;
-  
+    for (size_t k = 0; k < shapes[i].mesh.indices.size(); k += shapes[i].mesh.num_face_vertices[face_index++]) {
-      // Face index is 1-base.
+      // Check Materials
-      //int v0 = shapes[i].mesh.indices[3*k+0] + 1 + v_offset;
+      int material_id = shapes[i].mesh.material_ids[face_index];
-      //int v1 = shapes[i].mesh.indices[3*k+1] + 1 + v_offset;
-      //int v2 = shapes[i].mesh.indices[3*k+2] + 1 + v_offset;
-      int v0 = (3*k + 0) + 1 + v_offset;
-      int v1 = (3*k + 1) + 1 + v_offset;
-      int v2 = (3*k + 2) + 1 + v_offset;
-
-      int vt0 = (3*k + 0) + 1 + vt_offset;
-      int vt1 = (3*k + 1) + 1 + vt_offset;
-      int vt2 = (3*k + 2) + 1 + vt_offset;
-
-      int material_id = shapes[i].mesh.material_ids[k];
       if (material_id != prev_material_id) {
         std::string material_name = materials[material_id].name;
         fprintf(fp, "usemtl %s\n", material_name.c_str());
         prev_material_id = material_id;
       }
 
-      if (has_vn && has_vt) {
+      unsigned char v_per_f = shapes[i].mesh.num_face_vertices[face_index];
-        fprintf(fp, "f %d/%d/%d %d/%d/%d %d/%d/%d\n",
+      // Imperformant, but if you want to have variable vertices per face, you need some kind of a dynamic loop.
-          v0, vt0, v0, v1, vt1, v1, v2, vt2, v2);
+      fprintf(fp, "f");
-      } else if (has_vn && !has_vt) {
+      for(int l = 0; l < v_per_f; l++){
-        fprintf(fp, "f %d//%d %d//%d %d//%d\n", v0, v0, v1, v1, v2, v2);
+        const tinyobj::index_t& ref = shapes[i].mesh.indices[k + l];
-      } else if (!has_vn && has_vt) {
+        if(has_vn && has_vt){
-        fprintf(fp, "f %d/%d %d/%d %d/%d\n", v0, v0, v1, v1, v2, v2);
+          // v0/t0/vn0
-      } else {
+          fprintf(fp, " %d/%d/%d", ref.vertex_index + 1, ref.texcoord_index + 1, ref.normal_index + 1);
-        fprintf(fp, "f %d %d %d\n", v0, v1, v2);
+          continue;
         }
-      
+        if(has_vn && !has_vt){
+          // v0//vn0
+          fprintf(fp, " %d//%d", ref.vertex_index + 1, ref.normal_index + 1);
+          continue;
+        }
+        if(!has_vn && has_vt){
+          // v0/vt0
+          fprintf(fp, " %d/%d", ref.vertex_index + 1, ref.texcoord_index + 1);
+          continue;
+        }
+        if(!has_vn && !has_vt){
+          // v0 v1 v2
+          fprintf(fp, " %d", ref.vertex_index + 1);
+          continue;
+        }
+      }
+      fprintf(fp, "\n");
     }
-
-    v_offset  += shapes[i].mesh.indices.size();
-    //vn_offset += shapes[i].mesh.normals.size() / 3;
-    vt_offset += shapes[i].mesh.texcoords.size() / 2;
-
   }
 
   fclose(fp);
@@ -172,5 +162,3 @@ bool WriteObj(const std::string& filename, const std::vector<tinyobj::shape_t>&
 
   return ret;
 }
-
-

examples/obj_sticher/obj_writer.h

@@ -3,7 +3,6 @@
 
 #include "../../tiny_obj_loader.h"
 
-extern bool WriteObj(const std::string& filename, const std::vector<tinyobj::shape_t>& shapes, const std::vector<tinyobj::material_t>& materials, bool coordTransform = false);
+extern bool WriteObj(const std::string& filename, const tinyobj::attrib_t& attributes, const std::vector<tinyobj::shape_t>& shapes, const std::vector<tinyobj::material_t>& materials, bool coordTransform = false);
-
 
 #endif // __OBJ_WRITER_H__

examples/viewer/viewer.cc

@@ -37,11 +37,11 @@ extern "C" {
 #include <windows.h>
 
 #ifdef max
- #undef max
+#undef max
 #endif
 
 #ifdef min
- #undef min
+#undef min
 #endif
 
 #include <mmsystem.h>
@@ -143,15 +143,15 @@ float eye[3], lookat[3], up[3];
 
 GLFWwindow* window;
 
-static std::string GetBaseDir(const std::string &filepath) {
+static std::string GetBaseDir(const std::string& filepath) {
   if (filepath.find_last_of("/\\") != std::string::npos)
     return filepath.substr(0, filepath.find_last_of("/\\"));
   return "";
 }
 
-static bool FileExists(const std::string &abs_filename) {
+static bool FileExists(const std::string& abs_filename) {
   bool ret;
-  FILE *fp = fopen(abs_filename.c_str(), "rb");
+  FILE* fp = fopen(abs_filename.c_str(), "rb");
   if (fp) {
     ret = true;
     fclose(fp);
@@ -191,9 +191,101 @@ static void CalcNormal(float N[3], float v0[3], float v1[3], float v2[3]) {
 
     N[0] /= len;
     N[1] /= len;
+    N[2] /= len;
   }
 }
 
+namespace  // Local utility functions
+{
+struct vec3 {
+  float v[3];
+  vec3() {
+    v[0] = 0.0f;
+    v[1] = 0.0f;
+    v[2] = 0.0f;
+  }
+};
+
+void normalizeVector(vec3 &v) {
+  float len2 = v.v[0] * v.v[0] + v.v[1] * v.v[1] + v.v[2] * v.v[2];
+  if (len2 > 0.0f) {
+    float len = sqrtf(len2);
+
+    v.v[0] /= len;
+    v.v[1] /= len;
+    v.v[2] /= len;
+  }
+}
+
+// Check if `mesh_t` contains smoothing group id.
+bool hasSmoothingGroup(const tinyobj::shape_t& shape)
+{
+  for (size_t i = 0; i < shape.mesh.smoothing_group_ids.size(); i++) {
+    if (shape.mesh.smoothing_group_ids[i] > 0) {
+      return true;
+    }
+  }
+  return false;
+}
+
+void computeSmoothingNormals(const tinyobj::attrib_t& attrib, const tinyobj::shape_t& shape,
+                             std::map<int, vec3>& smoothVertexNormals) {
+  smoothVertexNormals.clear();
+  std::map<int, vec3>::iterator iter;
+
+  for (size_t f = 0; f < shape.mesh.indices.size() / 3; f++) {
+    // Get the three indexes of the face (all faces are triangular)
+    tinyobj::index_t idx0 = shape.mesh.indices[3 * f + 0];
+    tinyobj::index_t idx1 = shape.mesh.indices[3 * f + 1];
+    tinyobj::index_t idx2 = shape.mesh.indices[3 * f + 2];
+
+    // Get the three vertex indexes and coordinates
+    int vi[3];      // indexes
+    float v[3][3];  // coordinates
+
+    for (int k = 0; k < 3; k++) {
+      vi[0] = idx0.vertex_index;
+      vi[1] = idx1.vertex_index;
+      vi[2] = idx2.vertex_index;
+      assert(vi[0] >= 0);
+      assert(vi[1] >= 0);
+      assert(vi[2] >= 0);
+
+      v[0][k] = attrib.vertices[3 * vi[0] + k];
+      v[1][k] = attrib.vertices[3 * vi[1] + k];
+      v[2][k] = attrib.vertices[3 * vi[2] + k];
+    }
+
+    // Compute the normal of the face
+    float normal[3];
+    CalcNormal(normal, v[0], v[1], v[2]);
+
+    // Add the normal to the three vertexes
+    for (size_t i = 0; i < 3; ++i) {
+      iter = smoothVertexNormals.find(vi[i]);
+      if (iter != smoothVertexNormals.end()) {
+        // add
+        iter->second.v[0] += normal[0];
+        iter->second.v[1] += normal[1];
+        iter->second.v[2] += normal[2];
+      } else {
+        smoothVertexNormals[vi[i]].v[0] = normal[0];
+        smoothVertexNormals[vi[i]].v[1] = normal[1];
+        smoothVertexNormals[vi[i]].v[2] = normal[2];
+      }
+    }
+
+  }  // f
+
+  // Normalize the normals, that is, make them unit vectors
+  for (iter = smoothVertexNormals.begin(); iter != smoothVertexNormals.end();
+       iter++) {
+    normalizeVector(iter->second);
+  }
+
+}  // computeSmoothingNormals
+}  // namespace
+
 static bool LoadObjAndConvert(float bmin[3], float bmax[3],
                               std::vector<DrawObject>* drawObjects,
                               std::vector<tinyobj::material_t>& materials,
@@ -216,9 +308,13 @@ static bool LoadObjAndConvert(float bmin[3], float bmax[3],
   base_dir += "/";
 #endif
 
+  std::string warn;
   std::string err;
-  bool ret =
+  bool ret = tinyobj::LoadObj(&attrib, &shapes, &materials, &warn, &err, filename,
-      tinyobj::LoadObj(&attrib, &shapes, &materials, &err, filename, base_dir.c_str());
+                              base_dir.c_str());
+  if (!warn.empty()) {
+    std::cout << "WARN: " << warn << std::endl;
+  }
   if (!err.empty()) {
     std::cerr << err << std::endl;
   }
@@ -242,7 +338,8 @@ static bool LoadObjAndConvert(float bmin[3], float bmax[3],
   materials.push_back(tinyobj::material_t());
 
   for (size_t i = 0; i < materials.size(); i++) {
-    printf("material[%d].diffuse_texname = %s\n", int(i), materials[i].diffuse_texname.c_str());
+    printf("material[%d].diffuse_texname = %s\n", int(i),
+           materials[i].diffuse_texname.c_str());
   }
 
   // Load diffuse textures
@@ -262,27 +359,32 @@ static bool LoadObjAndConvert(float bmin[3], float bmax[3],
             // Append base dir.
             texture_filename = base_dir + mp->diffuse_texname;
             if (!FileExists(texture_filename)) {
-                      std::cerr << "Unable to find file: " << mp->diffuse_texname << std::endl;
+              std::cerr << "Unable to find file: " << mp->diffuse_texname
+                        << std::endl;
               exit(1);
             }
           }
 
-                  unsigned char* image = stbi_load(texture_filename.c_str(), &w, &h, &comp, STBI_default);
+          unsigned char* image =
+              stbi_load(texture_filename.c_str(), &w, &h, &comp, STBI_default);
           if (!image) {
-                      std::cerr << "Unable to load texture: " << texture_filename << std::endl;
+            std::cerr << "Unable to load texture: " << texture_filename
+                      << std::endl;
             exit(1);
           }
-                  std::cout << "Loaded texture: " << texture_filename << ", w = " << w << ", h = " << h << ", comp = " << comp << std::endl;
+          std::cout << "Loaded texture: " << texture_filename << ", w = " << w
+                    << ", h = " << h << ", comp = " << comp << std::endl;
 
           glGenTextures(1, &texture_id);
           glBindTexture(GL_TEXTURE_2D, texture_id);
           glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
           glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
           if (comp == 3) {
-                      glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, w, h, 0, GL_RGB, GL_UNSIGNED_BYTE, image);
+            glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, w, h, 0, GL_RGB,
-                  }
+                         GL_UNSIGNED_BYTE, image);
-                  else if (comp == 4) {
+          } else if (comp == 4) {
-                      glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, w, h, 0, GL_RGBA, GL_UNSIGNED_BYTE, image);
+            glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, w, h, 0, GL_RGBA,
+                         GL_UNSIGNED_BYTE, image);
           } else {
             assert(0);  // TODO
           }
@@ -301,6 +403,14 @@ static bool LoadObjAndConvert(float bmin[3], float bmax[3],
     for (size_t s = 0; s < shapes.size(); s++) {
       DrawObject o;
       std::vector<float> buffer;  // pos(3float), normal(3float), color(3float)
+
+      // Check for smoothing group and compute smoothing normals
+      std::map<int, vec3> smoothVertexNormals;
+      if (hasSmoothingGroup(shapes[s]) > 0) {
+        std::cout << "Compute smoothingNormal for shape [" << s << "]" << std::endl;
+        computeSmoothingNormals(attrib, shapes[s], smoothVertexNormals);
+      }
+
       for (size_t f = 0; f < shapes[s].mesh.indices.size() / 3; f++) {
         tinyobj::index_t idx0 = shapes[s].mesh.indices[3 * f + 0];
         tinyobj::index_t idx1 = shapes[s].mesh.indices[3 * f + 1];
@@ -308,12 +418,16 @@ static bool LoadObjAndConvert(float bmin[3], float bmax[3],
 
         int current_material_id = shapes[s].mesh.material_ids[f];
 
-        if ((current_material_id < 0) || (current_material_id >= static_cast<int>(materials.size()))) {
+        if ((current_material_id < 0) ||
+            (current_material_id >= static_cast<int>(materials.size()))) {
           // Invaid material ID. Use default material.
-          current_material_id = materials.size() - 1; // Default material is added to the last item in `materials`.
+          current_material_id =
+              materials.size() -
+              1;  // Default material is added to the last item in `materials`.
         }
-        //if (current_material_id >= materials.size()) {
+        // if (current_material_id >= materials.size()) {
-        //    std::cerr << "Invalid material index: " << current_material_id << std::endl;
+        //    std::cerr << "Invalid material index: " << current_material_id <<
+        //    std::endl;
         //}
         //
         float diffuse[3];
@@ -322,9 +436,22 @@ static bool LoadObjAndConvert(float bmin[3], float bmax[3],
         }
         float tc[3][2];
         if (attrib.texcoords.size() > 0) {
-            assert(attrib.texcoords.size() > 2 * idx0.texcoord_index + 1);
+          if ((idx0.texcoord_index < 0) || (idx1.texcoord_index < 0) ||
-            assert(attrib.texcoords.size() > 2 * idx1.texcoord_index + 1);
+              (idx2.texcoord_index < 0)) {
-            assert(attrib.texcoords.size() > 2 * idx2.texcoord_index + 1);
+            // face does not contain valid uv index.
+            tc[0][0] = 0.0f;
+            tc[0][1] = 0.0f;
+            tc[1][0] = 0.0f;
+            tc[1][1] = 0.0f;
+            tc[2][0] = 0.0f;
+            tc[2][1] = 0.0f;
+          } else {
+            assert(attrib.texcoords.size() >
+                   size_t(2 * idx0.texcoord_index + 1));
+            assert(attrib.texcoords.size() >
+                   size_t(2 * idx1.texcoord_index + 1));
+            assert(attrib.texcoords.size() >
+                   size_t(2 * idx2.texcoord_index + 1));
 
             // Flip Y coord.
             tc[0][0] = attrib.texcoords[2 * idx0.texcoord_index];
@@ -333,6 +460,7 @@ static bool LoadObjAndConvert(float bmin[3], float bmax[3],
             tc[1][1] = 1.0f - attrib.texcoords[2 * idx1.texcoord_index + 1];
             tc[2][0] = attrib.texcoords[2 * idx2.texcoord_index];
             tc[2][1] = 1.0f - attrib.texcoords[2 * idx2.texcoord_index + 1];
+          }
         } else {
           tc[0][0] = 0.0f;
           tc[0][1] = 0.0f;
@@ -363,19 +491,54 @@ static bool LoadObjAndConvert(float bmin[3], float bmax[3],
         }
 
         float n[3][3];
+        {
+          bool invalid_normal_index = false;
           if (attrib.normals.size() > 0) {
-          int f0 = idx0.normal_index;
+            int nf0 = idx0.normal_index;
-          int f1 = idx1.normal_index;
+            int nf1 = idx1.normal_index;
-          int f2 = idx2.normal_index;
+            int nf2 = idx2.normal_index;
-          assert(f0 >= 0);
+
-          assert(f1 >= 0);
+            if ((nf0 < 0) || (nf1 < 0) || (nf2 < 0)) {
-          assert(f2 >= 0);
+              // normal index is missing from this face.
+              invalid_normal_index = true;
+            } else {
               for (int k = 0; k < 3; k++) {
-            n[0][k] = attrib.normals[3 * f0 + k];
+                assert(size_t(3 * nf0 + k) < attrib.normals.size());
-            n[1][k] = attrib.normals[3 * f1 + k];
+                assert(size_t(3 * nf1 + k) < attrib.normals.size());
-            n[2][k] = attrib.normals[3 * f2 + k];
+                assert(size_t(3 * nf2 + k) < attrib.normals.size());
+                n[0][k] = attrib.normals[3 * nf0 + k];
+                n[1][k] = attrib.normals[3 * nf1 + k];
+                n[2][k] = attrib.normals[3 * nf2 + k];
+              }
             }
           } else {
+            invalid_normal_index = true;
+          }
+
+          if (invalid_normal_index && !smoothVertexNormals.empty()) {
+            // Use smoothing normals
+            int f0 = idx0.vertex_index;
+            int f1 = idx1.vertex_index;
+            int f2 = idx2.vertex_index;
+
+            if (f0 >= 0 && f1 >= 0 && f2 >= 0) {
+              n[0][0] = smoothVertexNormals[f0].v[0];
+              n[0][1] = smoothVertexNormals[f0].v[1];
+              n[0][2] = smoothVertexNormals[f0].v[2];
+
+              n[1][0] = smoothVertexNormals[f1].v[0];
+              n[1][1] = smoothVertexNormals[f1].v[1];
+              n[1][2] = smoothVertexNormals[f1].v[2];
+
+              n[2][0] = smoothVertexNormals[f2].v[0];
+              n[2][1] = smoothVertexNormals[f2].v[1];
+              n[2][2] = smoothVertexNormals[f2].v[2];
+
+              invalid_normal_index = false;
+            }
+          }
+
+          if (invalid_normal_index) {
             // compute geometric normal
             CalcNormal(n[0], v[0], v[1], v[2]);
             n[1][0] = n[0][0];
@@ -385,6 +548,7 @@ static bool LoadObjAndConvert(float bmin[3], float bmax[3],
             n[2][1] = n[0][1];
             n[2][2] = n[0][2];
           }
+        }
 
         for (int k = 0; k < 3; k++) {
           buffer.push_back(v[k][0]);
@@ -396,11 +560,9 @@ static bool LoadObjAndConvert(float bmin[3], float bmax[3],
           // Combine normal and diffuse to get color.
           float normal_factor = 0.2;
           float diffuse_factor = 1 - normal_factor;
-          float c[3] = {
+          float c[3] = {n[k][0] * normal_factor + diffuse[0] * diffuse_factor,
-              n[k][0] * normal_factor + diffuse[0] * diffuse_factor,
                         n[k][1] * normal_factor + diffuse[1] * diffuse_factor,
-              n[k][2] * normal_factor + diffuse[2] * diffuse_factor
+                        n[k][2] * normal_factor + diffuse[2] * diffuse_factor};
-          };
           float len2 = c[0] * c[0] + c[1] * c[1] + c[2] * c[2];
           if (len2 > 0.0f) {
             float len = sqrtf(len2);
@@ -422,8 +584,10 @@ static bool LoadObjAndConvert(float bmin[3], float bmax[3],
       o.numTriangles = 0;
 
       // OpenGL viewer does not support texturing with per-face material.
-      if (shapes[s].mesh.material_ids.size() > 0 && shapes[s].mesh.material_ids.size() > s) {
+      if (shapes[s].mesh.material_ids.size() > 0 &&
-          o.material_id = shapes[s].mesh.material_ids[0]; // use the material ID of the first face.
+          shapes[s].mesh.material_ids.size() > s) {
+        o.material_id = shapes[s].mesh.material_ids[0];  // use the material ID
+                                                         // of the first face.
       } else {
         o.material_id = materials.size() - 1;  // = ID for default material.
       }
@@ -432,9 +596,10 @@ static bool LoadObjAndConvert(float bmin[3], float bmax[3],
       if (buffer.size() > 0) {
         glGenBuffers(1, &o.vb_id);
         glBindBuffer(GL_ARRAY_BUFFER, o.vb_id);
-        glBufferData(GL_ARRAY_BUFFER, buffer.size() * sizeof(float), &buffer.at(0),
+        glBufferData(GL_ARRAY_BUFFER, buffer.size() * sizeof(float),
-                     GL_STATIC_DRAW);
+                     &buffer.at(0), GL_STATIC_DRAW);
-        o.numTriangles = buffer.size() / (3 + 3 + 3 + 2) / 3; // 3:vtx, 3:normal, 3:col, 2:texcoord
+        o.numTriangles = buffer.size() / (3 + 3 + 3 + 2) /
+                         3;  // 3:vtx, 3:normal, 3:col, 2:texcoord
 
         printf("shape[%d] # of triangles = %d\n", static_cast<int>(s),
                o.numTriangles);
@@ -549,7 +714,9 @@ static void motionFunc(GLFWwindow* window, double mouse_x, double mouse_y) {
   prevMouseY = mouse_y;
 }
 
-static void Draw(const std::vector<DrawObject>& drawObjects, std::vector<tinyobj::material_t>& materials, std::map<std::string, GLuint>& textures) {
+static void Draw(const std::vector<DrawObject>& drawObjects,
+                 std::vector<tinyobj::material_t>& materials,
+                 std::map<std::string, GLuint>& textures) {
   glPolygonMode(GL_FRONT, GL_FILL);
   glPolygonMode(GL_BACK, GL_FILL);
 
@@ -668,7 +835,8 @@ int main(int argc, char** argv) {
   float bmin[3], bmax[3];
   std::vector<tinyobj::material_t> materials;
   std::map<std::string, GLuint> textures;
-  if (false == LoadObjAndConvert(bmin, bmax, &gDrawObjects, materials, textures, argv[1])) {
+  if (false == LoadObjAndConvert(bmin, bmax, &gDrawObjects, materials, textures,
+                                 argv[1])) {
     return -1;
   }
 

examples/voxelize/main.cc

@@ -9,8 +9,9 @@ bool Voxelize(const char* filename, float voxelsizex, float voxelsizey, float vo
     tinyobj::attrib_t attrib;
     std::vector<tinyobj::shape_t> shapes;
     std::vector<tinyobj::material_t> materials;
+    std::string warn;
     std::string err;
-    bool ret = tinyobj::LoadObj(&attrib, &shapes, &materials, &err, filename);
+    bool ret = tinyobj::LoadObj(&attrib, &shapes, &materials, &warn, &err, filename);
 
     if (!err.empty()) {
       printf("err: %s\n", err.c_str());

experimental/README.md

@@ -6,11 +6,21 @@
 
 * C++-11 compiler
 
+## How to build
+
+```
+$ premak5 gmake
+```
+
 ## Compile options
 
 * zstd compressed .obj support. `--with-zstd` premake option.
 * gzip compressed .obj support. `--with-zlib` premake option.
 
+## Notes on AMD GPU + Linux
+
+You may need to link with libdrm(`-ldrm`).
+
 ## Licenses
 
 * lfpAlloc : MIT license.

experimental/tinyobj_loader_opt.h

@@ -312,6 +312,10 @@ typedef struct {
 
 typedef struct {
   std::string name;  // group name or object name.
+  // Shape's corresponding faces are accessed by attrib.indices[face_offset,
+  // face_offset + length] NOTE: you'll need to sum up
+  // attrib.face_num_verts[face_offset, face_offset + length] to find actual
+  // number of faces.
   unsigned int face_offset;
   unsigned int length;
 } shape_t;
@@ -330,7 +334,14 @@ typedef struct {
   std::vector<float, lfpAlloc::lfpAllocator<float> > normals;
   std::vector<float, lfpAlloc::lfpAllocator<float> > texcoords;
   std::vector<index_t, lfpAlloc::lfpAllocator<index_t> > indices;
+
+  // # of vertices for each face.
+  // 3 for triangle, 4 for qual, ...
+  // If triangulation is enabled and the original face are quad,
+  // face_num_verts will be 6(3 + 3)
   std::vector<int, lfpAlloc::lfpAllocator<int> > face_num_verts;
+
+  // Per-face material IDs.
   std::vector<int, lfpAlloc::lfpAllocator<int> > material_ids;
 } attrib_t;
 
@@ -1238,6 +1249,8 @@ typedef struct {
 // 3. Do parallel parsing for each line.
 // 4. Reconstruct final mesh data structure.
 
+// Raise # of max threads if you have more CPU cores...
+// In 2018, 32 cores are getting common in high-end workstaion PC.
 #define kMaxThreads (32)
 
 static inline bool is_line_ending(const char *p, size_t i, size_t end_i) {
@@ -1306,15 +1319,19 @@ bool parseObj(attrib_t *attrib, std::vector<shape_t> *shapes,
           end_idx = len - 1;
         }
 
+        // true if the line currently read must be added to the current line
+        // info
+        bool new_line_found =
+            (t == 0) || is_line_ending(buf, start_idx - 1, end_idx);
+
         size_t prev_pos = start_idx;
         for (size_t i = start_idx; i < end_idx; i++) {
           if (is_line_ending(buf, i, end_idx)) {
-            if ((t > 0) && (prev_pos == start_idx) &&
+            if (!new_line_found) {
-                (!is_line_ending(buf, start_idx - 1, end_idx))) {
               // first linebreak found in (chunk > 0), and a line before this
               // linebreak belongs to previous chunk, so skip it.
               prev_pos = i + 1;
-              continue;
+              new_line_found = true;
             } else {
               LineInfo info;
               info.pos = prev_pos;
@@ -1329,11 +1346,11 @@ bool parseObj(attrib_t *attrib, std::vector<shape_t> *shapes,
           }
         }
 
-        // Find extra line which spand across chunk boundary.
+        // If at least one line started in this chunk, find where it ends in the
-        if ((t < num_threads) && (buf[end_idx - 1] != '\n')) {
+        // rest of the buffer
-          auto extra_span_idx = (std::min)(end_idx - 1 + chunk_size, len);
+        if (new_line_found && (t < num_threads) && (buf[end_idx - 1] != '\n')) {
-          for (size_t i = end_idx; i < extra_span_idx; i++) {
+          for (size_t i = end_idx; i < len; i++) {
-            if (is_line_ending(buf, i, extra_span_idx)) {
+            if (is_line_ending(buf, i, len)) {
               LineInfo info;
               info.pos = prev_pos;
               info.len = i - prev_pos;
@@ -1390,7 +1407,6 @@ bool parseObj(attrib_t *attrib, std::vector<shape_t> *shapes,
 
     for (size_t t = 0; t < num_threads; t++) {
       workers->push_back(std::thread([&, t]() {
-
         for (size_t i = 0; i < line_infos[t].size(); i++) {
           Command command;
           bool ret = parseLine(&command, &buf[line_infos[t][i].pos],
@@ -1415,7 +1431,6 @@ bool parseObj(attrib_t *attrib, std::vector<shape_t> *shapes,
             commands[t].emplace_back(std::move(command));
           }
         }
-
       }));
     }
 
@@ -1440,7 +1455,9 @@ bool parseObj(attrib_t *attrib, std::vector<shape_t> *shapes,
     // std::cout << "mtllib :" << material_filename << std::endl;
 
     auto t1 = std::chrono::high_resolution_clock::now();
-
+    if (material_filename.back() == '\r') {
+      material_filename.pop_back();
+    }
     std::ifstream ifs(material_filename);
     if (ifs.good()) {
       LoadMtl(&material_map, materials, &ifs);
@@ -1491,7 +1508,7 @@ bool parseObj(attrib_t *attrib, std::vector<shape_t> *shapes,
     attrib->texcoords.resize(num_vt * 2);
     attrib->indices.resize(num_f);
     attrib->face_num_verts.resize(num_indices);
-    attrib->material_ids.resize(num_indices);
+    attrib->material_ids.resize(num_indices, -1);
 
     size_t v_offsets[kMaxThreads];
     size_t n_offsets[kMaxThreads];
@@ -1516,7 +1533,6 @@ bool parseObj(attrib_t *attrib, std::vector<shape_t> *shapes,
     StackVector<std::thread, 16> workers;
 
     for (size_t t = 0; t < num_threads; t++) {
-      int material_id = -1;  // -1 = default unknown material.
       workers->push_back(std::thread([&, t]() {
         size_t v_count = v_offsets[t];
         size_t n_count = n_offsets[t];
@@ -1529,15 +1545,40 @@ bool parseObj(attrib_t *attrib, std::vector<shape_t> *shapes,
             continue;
           } else if (commands[t][i].type == COMMAND_USEMTL) {
             if (commands[t][i].material_name &&
-                commands[t][i].material_name_len > 0) {
+                commands[t][i].material_name_len > 0 &&
+                // check if there are still faces after this command
+                face_count < num_indices) {
+              // Find next face
+              bool found = false;
+              size_t i_start = i + 1, t_next, i_next;
+              for (t_next = t; t_next < num_threads; t_next++) {
+                for (i_next = i_start; i_next < commands[t_next].size();
+                     i_next++) {
+                  if (commands[t_next][i_next].type == COMMAND_F) {
+                    found = true;
+                    break;
+                  }
+                }
+                if (found) break;
+                i_start = 0;
+              }
+              // Assign material to this face
+              if (found) {
                 std::string material_name(commands[t][i].material_name,
                                           commands[t][i].material_name_len);
-
+                for (size_t k = 0;
+                     k < commands[t_next][i_next].f_num_verts.size(); k++) {
                   if (material_map.find(material_name) != material_map.end()) {
-                material_id = material_map[material_name];
+                    attrib->material_ids[face_count + k] =
+                        material_map[material_name];
                   } else {
                     // Assign invalid material ID
-                material_id = -1;
+                    // Set a different value than the default, to
+                    // prevent following faces from being assigned a valid
+                    // material
+                    attrib->material_ids[face_count + k] = -2;
+                  }
+                }
               }
             }
           } else if (commands[t][i].type == COMMAND_V) {
@@ -1564,7 +1605,6 @@ bool parseObj(attrib_t *attrib, std::vector<shape_t> *shapes,
                   index_t(vertex_index, texcoord_index, normal_index);
             }
             for (size_t k = 0; k < commands[t][i].f_num_verts.size(); k++) {
-              attrib->material_ids[face_count + k] = material_id;
               attrib->face_num_verts[face_count + k] =
                   commands[t][i].f_num_verts[k];
             }
@@ -1580,6 +1620,12 @@ bool parseObj(attrib_t *attrib, std::vector<shape_t> *shapes,
       workers[t].join();
     }
 
+    // To each face with uninitialized material id,
+    // assign the material id of the last face preceding it that has one
+    for (size_t face_count = 1; face_count < num_indices; ++face_count)
+      if (attrib->material_ids[face_count] == -1)
+        attrib->material_ids[face_count] = attrib->material_ids[face_count - 1];
+
     auto t_end = std::chrono::high_resolution_clock::now();
     ms_merge = t_end - t_start;
   }
@@ -1639,7 +1685,8 @@ bool parseObj(attrib_t *attrib, std::vector<shape_t> *shapes,
           }
         }
         if (commands[t][i].type == COMMAND_F) {
-          face_count++;
+          // Consider generation of multiple faces per `f` line by triangulation
+          face_count += commands[t][i].f_num_verts.size();
         }
       }
     }

experimental/viewer.cc

@@ -357,7 +357,7 @@ bool LoadObjAndConvert(float bmin[3], float bmax[3], const char* filename, int n
         std::vector<float> vb; // pos(3float), normal(3float), color(3float)
         size_t face_offset = 0;
         for (size_t v = 0; v < attrib.face_num_verts.size(); v++) {
-          assert(attrib.face_num_verts[v] % 3 == 0); // assume all triangle face.
+          assert(attrib.face_num_verts[v] % 3 == 0); // assume all triangle face(multiple of 3).
           for (size_t f = 0; f < attrib.face_num_verts[v] / 3; f++) {
             tinyobj_opt::index_t idx0 = attrib.indices[face_offset+3*f+0];
             tinyobj_opt::index_t idx1 = attrib.indices[face_offset+3*f+1];

fuzzer/runner.py

@@ -0,0 +1,20 @@
+import os, sys
+import glob
+import subprocess
+
+def main():
+    for g in glob.glob("../tests/afl/id*"):
+        print(g)
+    
+        cmd = ["../a.out", g]
+
+        proc = subprocess.Popen(cmd)
+        try:
+            outs, errs = proc.communicate(timeout=15)
+            print(outs)
+        except TimeoutExpired:
+            proc.kill()
+            outs, errs = proc.communicate()
+
+
+main()

loader_example.cc

@@ -29,6 +29,13 @@ extern "C" {
 #endif
 #endif
 
+#ifdef __clang__
+#pragma clang diagnostic push
+#if __has_warning("-Wzero-as-null-pointer-constant")
+#pragma clang diagnostic ignored "-Wzero-as-null-pointer-constant"
+#endif
+#endif
+
 class timerutil {
  public:
 #ifdef _WIN32
@@ -130,14 +137,19 @@ static void PrintInfo(const tinyobj::attrib_t& attrib,
   for (size_t i = 0; i < shapes.size(); i++) {
     printf("shape[%ld].name = %s\n", static_cast<long>(i),
            shapes[i].name.c_str());
-    printf("Size of shape[%ld].indices: %lu\n", static_cast<long>(i),
+    printf("Size of shape[%ld].mesh.indices: %lu\n", static_cast<long>(i),
            static_cast<unsigned long>(shapes[i].mesh.indices.size()));
+    printf("Size of shape[%ld].path.indices: %lu\n", static_cast<long>(i),
+           static_cast<unsigned long>(shapes[i].path.indices.size()));
 
     size_t index_offset = 0;
 
     assert(shapes[i].mesh.num_face_vertices.size() ==
            shapes[i].mesh.material_ids.size());
 
+    assert(shapes[i].mesh.num_face_vertices.size() ==
+           shapes[i].mesh.smoothing_group_ids.size());
+
     printf("shape[%ld].num_faces: %lu\n", static_cast<long>(i),
            static_cast<unsigned long>(shapes[i].mesh.num_face_vertices.size()));
 
@@ -158,6 +170,8 @@ static void PrintInfo(const tinyobj::attrib_t& attrib,
 
       printf("  face[%ld].material_id = %d\n", static_cast<long>(f),
              shapes[i].mesh.material_ids[f]);
+      printf("  face[%ld].smoothing_group_id = %d\n", static_cast<long>(f),
+             shapes[i].mesh.smoothing_group_ids[f]);
 
       index_offset += fnum;
     }
@@ -271,14 +285,19 @@ static bool TestLoadObj(const char* filename, const char* basepath = NULL,
 
   timerutil t;
   t.start();
+  std::string warn;
   std::string err;
-  bool ret = tinyobj::LoadObj(&attrib, &shapes, &materials, &err, filename,
+  bool ret = tinyobj::LoadObj(&attrib, &shapes, &materials, &warn, &err, filename,
                               basepath, triangulate);
   t.end();
   printf("Parsing time: %lu [msecs]\n", t.msec());
 
+  if (!warn.empty()) {
+    std::cout << "WARN: " << warn << std::endl;
+  }
+
   if (!err.empty()) {
-    std::cerr << err << std::endl;
+    std::cerr << "ERR: " << err << std::endl;
   }
 
   if (!ret) {
@@ -362,16 +381,12 @@ static bool TestStreamLoadObj() {
     virtual bool operator()(const std::string& matId,
                             std::vector<material_t>* materials,
                             std::map<std::string, int>* matMap,
+                            std::string* warn,
                             std::string* err) {
+      (void)err;
       (void)matId;
-      std::string warning;
+      LoadMtl(matMap, materials, &m_matSStream, warn, err);
-      LoadMtl(matMap, materials, &m_matSStream, &warning);
 
-      if (!warning.empty()) {
-        if (err) {
-          (*err) += warning;
-        }
-      }
       return true;
     }
 
@@ -383,8 +398,9 @@ static bool TestStreamLoadObj() {
   tinyobj::attrib_t attrib;
   std::vector<tinyobj::shape_t> shapes;
   std::vector<tinyobj::material_t> materials;
+  std::string warn;
   std::string err;
-  bool ret = tinyobj::LoadObj(&attrib, &shapes, &materials, &err, &objStream,
+  bool ret = tinyobj::LoadObj(&attrib, &shapes, &materials, &warn, &err, &objStream,
                               &matSSReader);
 
   if (!err.empty()) {

models/colorspace-issue-184.mtl

@@ -0,0 +1,9 @@
+newmtl default
+Ka 0 0 0
+Kd 0 0 0
+Ks 0 0 0
+Kt 0.1 0.2 0.3
+map_Kd -colorspace sRGB -o 0.1 diffuse.jpg
+map_Ks -s 0.1 0.2 specular.jpg
+map_bump -colorspace linear -bm 3 bumpmap.jpg
+

models/colorspace-issue-184.obj

@@ -0,0 +1,7 @@
+mtllib colorspace-issue-184.mtl
+o Test
+v 1.864151 -1.219172 -5.532511
+v 0.575869 -0.666304 5.896140
+v 0.940448 1.000000 -1.971128
+usemtl default
+f 1 2 3

models/cube.obj

@@ -13,6 +13,7 @@ v 2.000000 2.000000 0.000000
 g front cube
 usemtl white
 f 1 2 3 4
+# two white spaces between 'back' and 'cube'
 g back  cube
 # expects white material
 f 8 7 6 5

models/invalid-face-definition.mtl

@@ -0,0 +1,24 @@
+newmtl white
+Ka 0 0 0
+Kd 1 1 1
+Ks 0 0 0
+
+newmtl red
+Ka 0 0 0
+Kd 1 0 0
+Ks 0 0 0
+
+newmtl green
+Ka 0 0 0
+Kd 0 1 0
+Ks 0 0 0
+
+newmtl blue
+Ka 0 0 0
+Kd 0 0 1
+Ks 0 0 0
+
+newmtl light
+Ka 20 20 20
+Kd 1 1 1
+Ks 0 0 0

models/invalid-face-definition.obj

@@ -0,0 +1,18 @@
+mtllib invalid-face-definition.mtl
+
+v 0.000000 2.000000 2.000000
+v 0.000000 0.000000 2.000000
+v 2.000000 0.000000 2.000000
+v 2.000000 2.000000 2.000000
+v 0.000000 2.000000 0.000000
+v 0.000000 0.000000 0.000000
+v 2.000000 0.000000 0.000000
+v 2.000000 2.000000 0.000000
+# 8 vertices
+
+g front cube
+usemtl white
+f 1
+g back cube
+# expects white material
+f 8 7

models/issue-161-inconsistent-f.obj

@@ -0,0 +1,37 @@
+o cube
+mtllib cube.mtl
+
+v -0.500000 -0.500000 0.500000
+v 0.500000 -0.500000 0.500000
+v -0.500000 0.500000 0.500000
+v 0.500000 0.500000 0.500000
+v -0.500000 0.500000 -0.500000
+v 0.500000 0.500000 -0.500000
+v -0.500000 -0.500000 -0.500000
+v 0.500000 -0.500000 -0.500000
+
+vt 0.000000 0.000000
+vt 1.000000 0.000000
+vt 0.000000 1.000000
+vt 1.000000 1.000000
+
+g cube
+usemtl cube
+s 1
+f 1/1 2/2 3/3
+f 3/3 2/2 4/4
+s 2
+f 3/1 4/2 5/3
+f 5/3 4/2 6/4
+s 3
+f 5/4 6/3 7/2
+f 7/2 6/3 8/1
+s 4
+f 7/1 8/2 1/3
+f 1/3 8/2 2/4
+s 5
+f 2/1 8/2 4/3
+f 4/3 8/2 6/4
+s 6
+f 7/1 1/2 5/3
+f 5 1 3

models/issue-162-smoothing-group.mtl

@@ -0,0 +1,23 @@
+newmtl test1
+  Ns 10.0000
+  Ni 1.5000
+  d 1.0000
+  Tr 0.0000
+  Tf 1.0000 1.0000 1.0000 
+  illum 2
+  Ka 0.0000 0.0000 0.0000
+  Kd 0.5 0.2 0.2
+  Ks 0.0000 0.0000 0.0000
+  Ke 0.0000 0.0000 0.0000
+
+ newmtl test2
+  Ns 10.0000
+  Ni 1.5000
+  d 1.0000
+  Tr 0.0000
+  Tf 1.0000 1.0000 1.0000 
+  illum 2
+  Ka 0.0000 0.0000 0.0000
+  Kd 0.2 0.5 0.2
+  Ks 0.0000 0.0000 0.0000
+  Ke 0.0000 0.0000 0.0000

models/issue-162-smoothing-group.obj

@@ -0,0 +1,51 @@
+
+# cube.obj
+#
+
+mtllib issue-162-smoothing-group.mtl
+
+v -0.500000 -0.500000 0.500000
+v 0.500000 -0.500000 0.500000
+v -0.500000 0.500000 0.500000
+v 0.500000 0.500000 0.500000
+v -0.500000 0.500000 -0.500000
+v 0.500000 0.500000 -0.500000
+v -0.500000 -0.500000 -0.500000
+v 0.500000 -0.500000 -0.500000
+
+vt 0.000000 0.000000
+vt 1.000000 0.000000
+vt 0.000000 1.000000
+vt 1.000000 1.000000
+
+vn 0.000000 0.000000 1.000000
+vn 0.000000 1.000000 0.000000
+vn 0.000000 0.000000 -1.000000
+vn 0.000000 -1.000000 0.000000
+vn 1.000000 0.000000 0.000000
+vn -1.000000 0.000000 0.000000
+
+usemtl test1
+g test1
+s 1
+f 1/1/1 2/2/1 3/3/1
+f 3/3/1 2/2/1 4/4/1
+
+usemtl test2
+g test2
+
+s off
+f 3/1/2 4/2/2 5/3/2
+f 5/3/2 4/2/2 6/4/2
+s 3
+f 5/4/3 6/3/3 7/2/3
+f 7/2/3 6/3/3 8/1/3
+s 4
+f 7/1/4 8/2/4 1/3/4
+f 1/3/4 8/2/4 2/4/4
+s 0
+f 2/1/5 8/2/5 4/3/5
+f 4/3/5 8/2/5 6/4/5
+s 6
+f 7/1/6 1/2/6 5/3/6
+f 5/3/6 1/2/6 3/4/6

models/line-prim.obj

@@ -0,0 +1,16 @@
+mtllib cube.mtl
+
+v 0.000000 2.000000 2.000000
+v 0.000000 0.000000 2.000000
+v 2.000000 0.000000 2.000000
+v 2.000000 2.000000 2.000000
+v 0.000000 2.000000 0.000000
+v 0.000000 0.000000 0.000000
+v 2.000000 0.000000 0.000000
+v 2.000000 2.000000 0.000000
+# 8 vertices
+
+g g0
+usemtl white
+l 1 2 3 4
+l 5 6 7

models/smoothing-group-two-squares.obj

@@ -0,0 +1,22 @@
+# from tinyobjloader issue #29
+
+v 0.000000 2.000000 0.000000
+v 0.000000 0.000000 0.000000
+v 2.000000 0.000000 0.000000
+v 2.000000 2.000000 0.000000
+v 4.000000 0.000000 -3.255298
+v 4.000000 2.000000 -3.255298
+#vn 0.000000 0.000000 1.000000
+#vn 0.000000 0.000000 1.000000
+#vn 0.276597 0.000000 0.960986
+#vn 0.276597 0.000000 0.960986
+#vn 0.531611 0.000000 0.846988
+#vn 0.531611 0.000000 0.846988
+# 6 vertices
+
+# 6 normals
+
+g all
+s 1
+f 1//1 2//2 3//3 4//4
+f 4//4 3//3 5//5

models/smoothing-normal.mtl

@@ -0,0 +1,24 @@
+newmtl white
+Ka 0 0 0
+Kd 1 1 1
+Ks 0 0 0
+
+newmtl red
+Ka 0 0 0
+Kd 1 0 0
+Ks 0 0 0
+
+newmtl green
+Ka 0 0 0
+Kd 0 1 0
+Ks 0 0 0
+
+newmtl blue
+Ka 0 0 0
+Kd 0 0 1
+Ks 0 0 0
+
+newmtl light
+Ka 20 20 20
+Kd 1 1 1
+Ks 0 0 0

models/smoothing-normal.obj

@@ -0,0 +1,35 @@
+mtllib smoothing-normal.mtl
+
+v 0.000000 2.000000 2.000000
+v 0.000000 0.000000 2.000000
+v 2.000000 0.000000 2.000000
+v 2.000000 2.000000 2.000000
+v 0.000000 2.000000 0.000000
+v 0.000000 0.000000 0.000000
+v 2.000000 0.000000 0.000000
+v 2.000000 2.000000 0.000000
+# 8 vertices
+
+g front cube
+usemtl white
+s 1
+f 1 2 3 4
+#g bottom cube
+#usemtl white
+s 1
+f 2 6 7 3
+
+g back cube
+# expects white material
+s off
+f 8 7 6 5
+#g right cube
+#usemtl red
+#f 4 3 7 8
+#g top cube
+#usemtl white
+#f 5 1 4 8
+#g left cube
+#usemtl green
+#f 5 6 2 1
+# 6 elements

tests/issue-177.mtl

@@ -0,0 +1,24 @@
+newmtl white
+Ka 0 0 0
+Kd 1 1 1
+Ks 0 0 0
+
+newmtl red
+Ka 0 0 0
+Kd 1 0 0
+Ks 0 0 0
+
+newmtl green
+Ka 0 0 0
+Kd 0 1 0
+Ks 0 0 0
+
+newmtl blue
+Ka 0 0 0
+Kd 0 0 1
+Ks 0 0 0
+
+newmtl light
+Ka 20 20 20
+Kd 1 1 1
+Ks 0 0 0

tests/issue-177.obj

@@ -0,0 +1,31 @@
+mtllib issue-177.mtl
+
+v 0.000000 2.000000 2.000000
+v 0.000000 0.000000 2.000000
+v 2.000000 0.000000 2.000000
+v 2.000000 2.000000 2.000000
+v 0.000000 2.000000 0.000000
+v 0.000000 0.000000 0.000000
+v 2.000000 0.000000 0.000000
+v 2.000000 2.000000 0.000000
+# 8 vertices
+
+g front cube
+usemtl white
+f 1 2 3 4
+g back cube
+# expects white material
+f 8 7 6 5
+g right cube
+usemtl red
+f 4 3 7 8
+g top cube
+usemtl white
+f 5 1 4 8
+g left cube
+usemtl green
+f 5 6 2 1
+g bottom cube
+usemtl white
+f 2 6 7 3
+# 6 elements

tests/tester.cc

@@ -1,57 +1,62 @@
 #define TINYOBJLOADER_IMPLEMENTATION
 #include "../tiny_obj_loader.h"
 
-#define CATCH_CONFIG_MAIN  // This tells Catch to provide a main() - only do this in one cpp file
+#define CATCH_CONFIG_MAIN  // This tells Catch to provide a main() - only do
+                           // this in one cpp file
 #include "catch.hpp"
 
+#include <cassert>
 #include <cstdio>
 #include <cstdlib>
-#include <cassert>
+#include <fstream>
 #include <iostream>
 #include <sstream>
-#include <fstream>
 
-static void PrintInfo(const tinyobj::attrib_t &attrib, const std::vector<tinyobj::shape_t>& shapes, const std::vector<tinyobj::material_t>& materials, bool triangulate = true)
+static void PrintInfo(const tinyobj::attrib_t& attrib,
-{
+                      const std::vector<tinyobj::shape_t>& shapes,
+                      const std::vector<tinyobj::material_t>& materials,
+                      bool triangulate = true) {
   std::cout << "# of vertices  : " << (attrib.vertices.size() / 3) << std::endl;
   std::cout << "# of normals   : " << (attrib.normals.size() / 3) << std::endl;
-  std::cout << "# of texcoords : " << (attrib.texcoords.size() / 2) << std::endl;
+  std::cout << "# of texcoords : " << (attrib.texcoords.size() / 2)
+            << std::endl;
 
   std::cout << "# of shapes    : " << shapes.size() << std::endl;
   std::cout << "# of materials : " << materials.size() << std::endl;
 
   for (size_t v = 0; v < attrib.vertices.size() / 3; v++) {
     printf("  v[%ld] = (%f, %f, %f)\n", v,
-      static_cast<const double>(attrib.vertices[3*v+0]),
+           static_cast<const double>(attrib.vertices[3 * v + 0]),
-      static_cast<const double>(attrib.vertices[3*v+1]),
+           static_cast<const double>(attrib.vertices[3 * v + 1]),
-      static_cast<const double>(attrib.vertices[3*v+2]));
+           static_cast<const double>(attrib.vertices[3 * v + 2]));
   }
 
   for (size_t v = 0; v < attrib.normals.size() / 3; v++) {
     printf("  n[%ld] = (%f, %f, %f)\n", v,
-      static_cast<const double>(attrib.normals[3*v+0]),
+           static_cast<const double>(attrib.normals[3 * v + 0]),
-      static_cast<const double>(attrib.normals[3*v+1]),
+           static_cast<const double>(attrib.normals[3 * v + 1]),
-      static_cast<const double>(attrib.normals[3*v+2]));
+           static_cast<const double>(attrib.normals[3 * v + 2]));
   }
 
   for (size_t v = 0; v < attrib.texcoords.size() / 2; v++) {
     printf("  uv[%ld] = (%f, %f)\n", v,
-      static_cast<const double>(attrib.texcoords[2*v+0]),
+           static_cast<const double>(attrib.texcoords[2 * v + 0]),
-      static_cast<const double>(attrib.texcoords[2*v+1]));
+           static_cast<const double>(attrib.texcoords[2 * v + 1]));
   }
 
   for (size_t i = 0; i < shapes.size(); i++) {
     printf("shape[%ld].name = %s\n", i, shapes[i].name.c_str());
-    printf("Size of shape[%ld].indices: %ld\n", i, shapes[i].mesh.indices.size());
+    printf("Size of shape[%ld].indices: %ld\n", i,
+           shapes[i].mesh.indices.size());
 
-    if (triangulate)
+    if (triangulate) {
-    {
+      printf("Size of shape[%ld].material_ids: %ld\n", i,
-        printf("Size of shape[%ld].material_ids: %ld\n", i, shapes[i].mesh.material_ids.size());
+             shapes[i].mesh.material_ids.size());
       assert((shapes[i].mesh.indices.size() % 3) == 0);
       for (size_t f = 0; f < shapes[i].mesh.indices.size() / 3; f++) {
-          tinyobj::index_t i0 = shapes[i].mesh.indices[3*f+0];
+        tinyobj::index_t i0 = shapes[i].mesh.indices[3 * f + 0];
-          tinyobj::index_t i1 = shapes[i].mesh.indices[3*f+1];
+        tinyobj::index_t i1 = shapes[i].mesh.indices[3 * f + 1];
-          tinyobj::index_t i2 = shapes[i].mesh.indices[3*f+2];
+        tinyobj::index_t i2 = shapes[i].mesh.indices[3 * f + 2];
         printf("  idx[%ld] = %d/%d/%d, %d/%d/%d, %d/%d/%d. mat_id = %d\n", f,
                i0.vertex_index, i0.normal_index, i0.texcoord_index,
                i1.vertex_index, i1.normal_index, i1.texcoord_index,
@@ -61,27 +66,29 @@ static void PrintInfo(const tinyobj::attrib_t &attrib, const std::vector<tinyobj
     } else {
       for (size_t f = 0; f < shapes[i].mesh.indices.size(); f++) {
         tinyobj::index_t idx = shapes[i].mesh.indices[f];
-        printf("  idx[%ld] = %d/%d/%d\n", f, idx.vertex_index, idx.normal_index, idx.texcoord_index);
+        printf("  idx[%ld] = %d/%d/%d\n", f, idx.vertex_index, idx.normal_index,
+               idx.texcoord_index);
       }
 
-      printf("Size of shape[%ld].material_ids: %ld\n", i, shapes[i].mesh.material_ids.size());
+      printf("Size of shape[%ld].material_ids: %ld\n", i,
-      assert(shapes[i].mesh.material_ids.size() == shapes[i].mesh.num_face_vertices.size());
+             shapes[i].mesh.material_ids.size());
+      assert(shapes[i].mesh.material_ids.size() ==
+             shapes[i].mesh.num_face_vertices.size());
       for (size_t m = 0; m < shapes[i].mesh.material_ids.size(); m++) {
-        printf("  material_id[%ld] = %d\n", m,
+        printf("  material_id[%ld] = %d\n", m, shapes[i].mesh.material_ids[m]);
-          shapes[i].mesh.material_ids[m]);
+      }
     }
 
-    }
+    printf("shape[%ld].num_faces: %ld\n", i,
-
+           shapes[i].mesh.num_face_vertices.size());
-    printf("shape[%ld].num_faces: %ld\n", i, shapes[i].mesh.num_face_vertices.size());
     for (size_t v = 0; v < shapes[i].mesh.num_face_vertices.size(); v++) {
       printf("  num_vertices[%ld] = %ld\n", v,
              static_cast<long>(shapes[i].mesh.num_face_vertices[v]));
     }
 
-    //printf("shape[%ld].vertices: %ld\n", i, shapes[i].mesh.positions.size());
+    // printf("shape[%ld].vertices: %ld\n", i, shapes[i].mesh.positions.size());
-    //assert((shapes[i].mesh.positions.size() % 3) == 0);
+    // assert((shapes[i].mesh.positions.size() % 3) == 0);
-    //for (size_t v = 0; v < shapes[i].mesh.positions.size() / 3; v++) {
+    // for (size_t v = 0; v < shapes[i].mesh.positions.size() / 3; v++) {
     //  printf("  v[%ld] = (%f, %f, %f)\n", v,
     //    static_cast<const double>(shapes[i].mesh.positions[3*v+0]),
     //    static_cast<const double>(shapes[i].mesh.positions[3*v+1]),
@@ -92,33 +99,28 @@ static void PrintInfo(const tinyobj::attrib_t &attrib, const std::vector<tinyobj
     for (size_t t = 0; t < shapes[i].mesh.tags.size(); t++) {
       printf("  tag[%ld] = %s ", t, shapes[i].mesh.tags[t].name.c_str());
       printf(" ints: [");
-      for (size_t j = 0; j < shapes[i].mesh.tags[t].intValues.size(); ++j)
+      for (size_t j = 0; j < shapes[i].mesh.tags[t].intValues.size(); ++j) {
-      {
         printf("%ld", static_cast<long>(shapes[i].mesh.tags[t].intValues[j]));
-          if (j < (shapes[i].mesh.tags[t].intValues.size()-1))
+        if (j < (shapes[i].mesh.tags[t].intValues.size() - 1)) {
-          {
           printf(", ");
         }
       }
       printf("]");
 
       printf(" floats: [");
-      for (size_t j = 0; j < shapes[i].mesh.tags[t].floatValues.size(); ++j)
+      for (size_t j = 0; j < shapes[i].mesh.tags[t].floatValues.size(); ++j) {
-      {
+        printf("%f", static_cast<const double>(
-          printf("%f", static_cast<const double>(shapes[i].mesh.tags[t].floatValues[j]));
+                         shapes[i].mesh.tags[t].floatValues[j]));
-          if (j < (shapes[i].mesh.tags[t].floatValues.size()-1))
+        if (j < (shapes[i].mesh.tags[t].floatValues.size() - 1)) {
-          {
           printf(", ");
         }
       }
       printf("]");
 
       printf(" strings: [");
-      for (size_t j = 0; j < shapes[i].mesh.tags[t].stringValues.size(); ++j)
+      for (size_t j = 0; j < shapes[i].mesh.tags[t].stringValues.size(); ++j) {
-      {
         printf("%s", shapes[i].mesh.tags[t].stringValues[j].c_str());
-          if (j < (shapes[i].mesh.tags[t].stringValues.size()-1))
+        if (j < (shapes[i].mesh.tags[t].stringValues.size() - 1)) {
-          {
           printf(", ");
         }
       }
@@ -129,25 +131,45 @@ static void PrintInfo(const tinyobj::attrib_t &attrib, const std::vector<tinyobj
 
   for (size_t i = 0; i < materials.size(); i++) {
     printf("material[%ld].name = %s\n", i, materials[i].name.c_str());
-    printf("  material.Ka = (%f, %f ,%f)\n", static_cast<const double>(materials[i].ambient[0]),       static_cast<const double>(materials[i].ambient[1]),       static_cast<const double>(materials[i].ambient[2]));
+    printf("  material.Ka = (%f, %f ,%f)\n",
-    printf("  material.Kd = (%f, %f ,%f)\n", static_cast<const double>(materials[i].diffuse[0]),       static_cast<const double>(materials[i].diffuse[1]),       static_cast<const double>(materials[i].diffuse[2]));
+           static_cast<const double>(materials[i].ambient[0]),
-    printf("  material.Ks = (%f, %f ,%f)\n", static_cast<const double>(materials[i].specular[0]),      static_cast<const double>(materials[i].specular[1]),      static_cast<const double>(materials[i].specular[2]));
+           static_cast<const double>(materials[i].ambient[1]),
-    printf("  material.Tr = (%f, %f ,%f)\n", static_cast<const double>(materials[i].transmittance[0]), static_cast<const double>(materials[i].transmittance[1]), static_cast<const double>(materials[i].transmittance[2]));
+           static_cast<const double>(materials[i].ambient[2]));
-    printf("  material.Ke = (%f, %f ,%f)\n", static_cast<const double>(materials[i].emission[0]),      static_cast<const double>(materials[i].emission[1]),      static_cast<const double>(materials[i].emission[2]));
+    printf("  material.Kd = (%f, %f ,%f)\n",
-    printf("  material.Ns = %f\n", static_cast<const double>(materials[i].shininess));
+           static_cast<const double>(materials[i].diffuse[0]),
+           static_cast<const double>(materials[i].diffuse[1]),
+           static_cast<const double>(materials[i].diffuse[2]));
+    printf("  material.Ks = (%f, %f ,%f)\n",
+           static_cast<const double>(materials[i].specular[0]),
+           static_cast<const double>(materials[i].specular[1]),
+           static_cast<const double>(materials[i].specular[2]));
+    printf("  material.Tr = (%f, %f ,%f)\n",
+           static_cast<const double>(materials[i].transmittance[0]),
+           static_cast<const double>(materials[i].transmittance[1]),
+           static_cast<const double>(materials[i].transmittance[2]));
+    printf("  material.Ke = (%f, %f ,%f)\n",
+           static_cast<const double>(materials[i].emission[0]),
+           static_cast<const double>(materials[i].emission[1]),
+           static_cast<const double>(materials[i].emission[2]));
+    printf("  material.Ns = %f\n",
+           static_cast<const double>(materials[i].shininess));
     printf("  material.Ni = %f\n", static_cast<const double>(materials[i].ior));
-    printf("  material.dissolve = %f\n", static_cast<const double>(materials[i].dissolve));
+    printf("  material.dissolve = %f\n",
+           static_cast<const double>(materials[i].dissolve));
     printf("  material.illum = %d\n", materials[i].illum);
     printf("  material.map_Ka = %s\n", materials[i].ambient_texname.c_str());
     printf("  material.map_Kd = %s\n", materials[i].diffuse_texname.c_str());
     printf("  material.map_Ks = %s\n", materials[i].specular_texname.c_str());
-    printf("  material.map_Ns = %s\n", materials[i].specular_highlight_texname.c_str());
+    printf("  material.map_Ns = %s\n",
+           materials[i].specular_highlight_texname.c_str());
     printf("  material.map_bump = %s\n", materials[i].bump_texname.c_str());
     printf("  material.map_d = %s\n", materials[i].alpha_texname.c_str());
     printf("  material.disp = %s\n", materials[i].displacement_texname.c_str());
     printf("  material.refl = %s\n", materials[i].reflection_texname.c_str());
-    std::map<std::string, std::string>::const_iterator it(materials[i].unknown_parameter.begin());
+    std::map<std::string, std::string>::const_iterator it(
-    std::map<std::string, std::string>::const_iterator itEnd(materials[i].unknown_parameter.end());
+        materials[i].unknown_parameter.begin());
+    std::map<std::string, std::string>::const_iterator itEnd(
+        materials[i].unknown_parameter.end());
 
     for (; it != itEnd; it++) {
       printf("  material.%s = %s\n", it->first.c_str(), it->second.c_str());
@@ -156,23 +178,25 @@ static void PrintInfo(const tinyobj::attrib_t &attrib, const std::vector<tinyobj
   }
 }
 
-static bool
+static bool TestLoadObj(const char* filename, const char* basepath = NULL,
-TestLoadObj(
+                        bool triangulate = true) {
-  const char* filename,
-  const char* basepath = NULL,
-  bool triangulate = true)
-{
   std::cout << "Loading " << filename << std::endl;
 
   tinyobj::attrib_t attrib;
   std::vector<tinyobj::shape_t> shapes;
   std::vector<tinyobj::material_t> materials;
 
+  std::string warn;
   std::string err;
-  bool ret = tinyobj::LoadObj(&attrib, &shapes, &materials, &err, filename, basepath, triangulate);
+  bool ret = tinyobj::LoadObj(&attrib, &shapes, &materials, &warn, &err,
+                              filename, basepath, triangulate);
+
+  if (!warn.empty()) {
+    std::cout << "WARN: " << warn << std::endl;
+  }
 
   if (!err.empty()) {
-    std::cerr << err << std::endl;
+    std::cerr << "ERR: " << err << std::endl;
   }
 
   if (!ret) {
@@ -185,13 +209,10 @@ TestLoadObj(
   return true;
 }
 
-static bool
+static bool TestLoadObjFromPreopenedFile(const char* filename,
-TestLoadObjFromPreopenedFile(
-  const char* filename,
                                          const char* basepath = NULL,
                                          bool readMaterials = true,
-  bool triangulate = true)
+                                         bool triangulate = true) {
-{
   std::string fullFilename = std::string(basepath) + filename;
   std::cout << "Loading " << fullFilename << std::endl;
 
@@ -203,19 +224,24 @@ TestLoadObjFromPreopenedFile(
   }
 
   tinyobj::MaterialStreamReader materialStreamReader(fileStream);
-  tinyobj::MaterialStreamReader* materialReader = readMaterials
+  tinyobj::MaterialStreamReader* materialReader =
-    ? &materialStreamReader
+      readMaterials ? &materialStreamReader : NULL;
-    : NULL;
 
   tinyobj::attrib_t attrib;
   std::vector<tinyobj::shape_t> shapes;
   std::vector<tinyobj::material_t> materials;
 
+  std::string warn;
   std::string err;
-  bool ret = tinyobj::LoadObj(&attrib, &shapes, &materials, &err, &fileStream, materialReader);
+  bool ret = tinyobj::LoadObj(&attrib, &shapes, &materials, &warn, &err,
+                              &fileStream, materialReader);
+
+  if (!warn.empty()) {
+    std::cout << "WARN: " << warn << std::endl;
+  }
 
   if (!err.empty()) {
-    std::cerr << err << std::endl;
+    std::cerr << "ERR: " << err << std::endl;
   }
 
   if (!ret) {
@@ -228,14 +254,11 @@ TestLoadObjFromPreopenedFile(
   return true;
 }
 
-static bool
+static bool TestStreamLoadObj() {
-TestStreamLoadObj()
-{
   std::cout << "Stream Loading " << std::endl;
 
   std::stringstream objStream;
-  objStream
+  objStream << "mtllib cube.mtl\n"
-    << "mtllib cube.mtl\n"
                "\n"
                "v 0.000000 2.000000 2.000000\n"
                "v 0.000000 0.000000 2.000000\n"
@@ -267,7 +290,7 @@ TestStreamLoadObj()
                "f 2 6 7 3\n"
                "# 6 elements";
 
-std::string matStream(
+  std::string matStream(
       "newmtl white\n"
       "Ka 0 0 0\n"
       "Kd 1 1 1\n"
@@ -294,22 +317,21 @@ std::string matStream(
       "Ks 0 0 0");
 
   using namespace tinyobj;
-    class MaterialStringStreamReader:
+  class MaterialStringStreamReader : public MaterialReader {
-        public MaterialReader
-    {
    public:
-            MaterialStringStreamReader(const std::string& matSStream): m_matSStream(matSStream) {}
+    MaterialStringStreamReader(const std::string& matSStream)
+        : m_matSStream(matSStream) {}
     virtual ~MaterialStringStreamReader() {}
-            virtual bool operator() (
+    virtual bool operator()(const std::string& matId,
-              const std::string& matId,
                             std::vector<material_t>* materials,
                             std::map<std::string, int>* matMap,
-              std::string* err)
+                            std::string* warn, std::string* err) {
-            {
       (void)matId;
+      (void)warn;
       (void)err;
       std::string warning;
-                LoadMtl(matMap, materials, &m_matSStream, &warning);
+      std::string error_msg;
+      LoadMtl(matMap, materials, &m_matSStream, &warning, &error_msg);
       return true;
     }
 
@@ -321,11 +343,17 @@ std::string matStream(
   tinyobj::attrib_t attrib;
   std::vector<tinyobj::shape_t> shapes;
   std::vector<tinyobj::material_t> materials;
+  std::string warn;
   std::string err;
-  bool ret = tinyobj::LoadObj(&attrib, &shapes, &materials, &err, &objStream, &matSSReader);    
+  bool ret = tinyobj::LoadObj(&attrib, &shapes, &materials, &warn, &err,
+                              &objStream, &matSSReader);
+
+  if (!warn.empty()) {
+    std::cout << "WARN: " << warn << std::endl;
+  }
 
   if (!err.empty()) {
-    std::cerr << err << std::endl;
+    std::cerr << "ERR: " << err << std::endl;
   }
 
   if (!ret) {
@@ -340,21 +368,26 @@ std::string matStream(
 const char* gMtlBasePath = "../models/";
 
 TEST_CASE("cornell_box", "[Loader]") {
-
   REQUIRE(true == TestLoadObj("../models/cornell_box.obj", gMtlBasePath));
 }
 
 TEST_CASE("catmark_torus_creases0", "[Loader]") {
-
   tinyobj::attrib_t attrib;
   std::vector<tinyobj::shape_t> shapes;
   std::vector<tinyobj::material_t> materials;
 
+  std::string warn;
   std::string err;
-  bool ret = tinyobj::LoadObj(&attrib, &shapes, &materials, &err, "../models/catmark_torus_creases0.obj", gMtlBasePath, /*triangulate*/false);
+  bool ret = tinyobj::LoadObj(&attrib, &shapes, &materials, &warn, &err,
+                              "../models/catmark_torus_creases0.obj",
+                              gMtlBasePath, /*triangulate*/ false);
+
+  if (!warn.empty()) {
+    std::cout << "WARN: " << warn << std::endl;
+  }
 
   if (!err.empty()) {
-    std::cerr << err << std::endl;
+    std::cerr << "ERR: " << err << std::endl;
   }
 
   REQUIRE(true == ret);
@@ -364,16 +397,22 @@ TEST_CASE("catmark_torus_creases0", "[Loader]") {
 }
 
 TEST_CASE("pbr", "[Loader]") {
-
   tinyobj::attrib_t attrib;
   std::vector<tinyobj::shape_t> shapes;
   std::vector<tinyobj::material_t> materials;
 
+  std::string warn;
   std::string err;
-  bool ret = tinyobj::LoadObj(&attrib, &shapes, &materials, &err, "../models/pbr-mat-ext.obj", gMtlBasePath, /*triangulate*/false);
+  bool ret = tinyobj::LoadObj(&attrib, &shapes, &materials, &warn, &err,
+                              "../models/pbr-mat-ext.obj", gMtlBasePath,
+                              /*triangulate*/ false);
+
+  if (!warn.empty()) {
+    std::cout << "WARN: " << warn << std::endl;
+  }
 
   if (!err.empty()) {
-    std::cerr << err << std::endl;
+    std::cerr << "ERR: " << err << std::endl;
   }
   REQUIRE(true == ret);
   REQUIRE(1 == materials.size());
@@ -391,18 +430,18 @@ TEST_CASE("pbr", "[Loader]") {
   REQUIRE(0 == materials[0].normal_texname.compare("normalmap.tex"));
 }
 
-TEST_CASE("stream_load", "[Stream]") {
+TEST_CASE("stream_load", "[Stream]") { REQUIRE(true == TestStreamLoadObj()); }
-    REQUIRE(true == TestStreamLoadObj());
-}
 
 TEST_CASE("stream_load_from_file_skipping_materials", "[Stream]") {
   REQUIRE(true == TestLoadObjFromPreopenedFile(
-    "../models/pbr-mat-ext.obj", gMtlBasePath, /*readMaterials*/false, /*triangulate*/false));
+                      "../models/pbr-mat-ext.obj", gMtlBasePath,
+                      /*readMaterials*/ false, /*triangulate*/ false));
 }
 
 TEST_CASE("stream_load_from_file_with_materials", "[Stream]") {
   REQUIRE(true == TestLoadObjFromPreopenedFile(
-    "../models/pbr-mat-ext.obj", gMtlBasePath, /*readMaterials*/true, /*triangulate*/false));
+                      "../models/pbr-mat-ext.obj", gMtlBasePath,
+                      /*readMaterials*/ true, /*triangulate*/ false));
 }
 
 TEST_CASE("trailing_whitespace_in_mtl", "[Issue92]") {
@@ -410,11 +449,17 @@ TEST_CASE("trailing_whitespace_in_mtl", "[Issue92]") {
   std::vector<tinyobj::shape_t> shapes;
   std::vector<tinyobj::material_t> materials;
 
+  std::string warn;
   std::string err;
-  bool ret = tinyobj::LoadObj(&attrib, &shapes, &materials, &err, "../models/issue-92.obj", gMtlBasePath);
+  bool ret = tinyobj::LoadObj(&attrib, &shapes, &materials, &warn, &err,
+                              "../models/issue-92.obj", gMtlBasePath);
+
+  if (!warn.empty()) {
+    std::cout << "WARN: " << warn << std::endl;
+  }
 
   if (!err.empty()) {
-    std::cerr << err << std::endl;
+    std::cerr << "ERR: " << err << std::endl;
   }
   REQUIRE(true == ret);
   REQUIRE(1 == materials.size());
@@ -426,11 +471,17 @@ TEST_CASE("transmittance_filter", "[Issue95]") {
   std::vector<tinyobj::shape_t> shapes;
   std::vector<tinyobj::material_t> materials;
 
+  std::string warn;
   std::string err;
-  bool ret = tinyobj::LoadObj(&attrib, &shapes, &materials, &err, "../models/issue-95.obj", gMtlBasePath);
+  bool ret = tinyobj::LoadObj(&attrib, &shapes, &materials, &warn, &err,
+                              "../models/issue-95.obj", gMtlBasePath);
+
+  if (!warn.empty()) {
+    std::cout << "WARN: " << warn << std::endl;
+  }
 
   if (!err.empty()) {
-    std::cerr << err << std::endl;
+    std::cerr << "ERR: " << err << std::endl;
   }
   REQUIRE(true == ret);
   REQUIRE(1 == materials.size());
@@ -444,11 +495,17 @@ TEST_CASE("transmittance_filter_Tf", "[Issue95-Tf]") {
   std::vector<tinyobj::shape_t> shapes;
   std::vector<tinyobj::material_t> materials;
 
+  std::string warn;
   std::string err;
-  bool ret = tinyobj::LoadObj(&attrib, &shapes, &materials, &err, "../models/issue-95-2.obj", gMtlBasePath);
+  bool ret = tinyobj::LoadObj(&attrib, &shapes, &materials, &warn, &err,
+                              "../models/issue-95-2.obj", gMtlBasePath);
+
+  if (!warn.empty()) {
+    std::cout << "WARN: " << warn << std::endl;
+  }
 
   if (!err.empty()) {
-    std::cerr << err << std::endl;
+    std::cerr << "ERR: " << err << std::endl;
   }
   REQUIRE(true == ret);
   REQUIRE(1 == materials.size());
@@ -462,11 +519,17 @@ TEST_CASE("transmittance_filter_Kt", "[Issue95-Kt]") {
   std::vector<tinyobj::shape_t> shapes;
   std::vector<tinyobj::material_t> materials;
 
+  std::string warn;
   std::string err;
-  bool ret = tinyobj::LoadObj(&attrib, &shapes, &materials, &err, "../models/issue-95.obj", gMtlBasePath);
+  bool ret = tinyobj::LoadObj(&attrib, &shapes, &materials, &warn, &err,
+                              "../models/issue-95.obj", gMtlBasePath);
+
+  if (!warn.empty()) {
+    std::cout << "WARN: " << warn << std::endl;
+  }
 
   if (!err.empty()) {
-    std::cerr << err << std::endl;
+    std::cerr << "ERR: " << err << std::endl;
   }
   REQUIRE(true == ret);
   REQUIRE(1 == materials.size());
@@ -480,11 +543,17 @@ TEST_CASE("usemtl_at_last_line", "[Issue104]") {
   std::vector<tinyobj::shape_t> shapes;
   std::vector<tinyobj::material_t> materials;
 
+  std::string warn;
   std::string err;
-  bool ret = tinyobj::LoadObj(&attrib, &shapes, &materials, &err, "../models/usemtl-issue-104.obj", gMtlBasePath);
+  bool ret = tinyobj::LoadObj(&attrib, &shapes, &materials, &warn, &err,
+                              "../models/usemtl-issue-104.obj", gMtlBasePath);
+
+  if (!warn.empty()) {
+    std::cout << "WARN: " << warn << std::endl;
+  }
 
   if (!err.empty()) {
-    std::cerr << err << std::endl;
+    std::cerr << "ERR: " << err << std::endl;
   }
   REQUIRE(true == ret);
   REQUIRE(1 == shapes.size());
@@ -495,11 +564,18 @@ TEST_CASE("texture_opts", "[Issue85]") {
   std::vector<tinyobj::shape_t> shapes;
   std::vector<tinyobj::material_t> materials;
 
+  std::string warn;
   std::string err;
-  bool ret = tinyobj::LoadObj(&attrib, &shapes, &materials, &err, "../models/texture-options-issue-85.obj", gMtlBasePath);
+  bool ret =
+      tinyobj::LoadObj(&attrib, &shapes, &materials, &warn, &err,
+                       "../models/texture-options-issue-85.obj", gMtlBasePath);
+
+  if (!warn.empty()) {
+    std::cout << "WARN: " << warn << std::endl;
+  }
 
   if (!err.empty()) {
-    std::cerr << err << std::endl;
+    std::cerr << "ERR: " << err << std::endl;
   }
   REQUIRE(true == ret);
   REQUIRE(1 == shapes.size());
@@ -525,11 +601,13 @@ TEST_CASE("texture_opts", "[Issue85]") {
 
   REQUIRE(tinyobj::TEXTURE_TYPE_SPHERE == materials[2].diffuse_texopt.type);
   REQUIRE(tinyobj::TEXTURE_TYPE_CUBE_TOP == materials[2].specular_texopt.type);
-  REQUIRE(tinyobj::TEXTURE_TYPE_CUBE_BOTTOM == materials[2].specular_highlight_texopt.type);
+  REQUIRE(tinyobj::TEXTURE_TYPE_CUBE_BOTTOM ==
+          materials[2].specular_highlight_texopt.type);
   REQUIRE(tinyobj::TEXTURE_TYPE_CUBE_LEFT == materials[2].ambient_texopt.type);
   REQUIRE(tinyobj::TEXTURE_TYPE_CUBE_RIGHT == materials[2].alpha_texopt.type);
   REQUIRE(tinyobj::TEXTURE_TYPE_CUBE_FRONT == materials[2].bump_texopt.type);
-  REQUIRE(tinyobj::TEXTURE_TYPE_CUBE_BACK == materials[2].displacement_texopt.type);
+  REQUIRE(tinyobj::TEXTURE_TYPE_CUBE_BACK ==
+          materials[2].displacement_texopt.type);
 }
 
 TEST_CASE("mtllib_multiple_filenames", "[Issue112]") {
@@ -537,11 +615,18 @@ TEST_CASE("mtllib_multiple_filenames", "[Issue112]") {
   std::vector<tinyobj::shape_t> shapes;
   std::vector<tinyobj::material_t> materials;
 
+  std::string warn;
   std::string err;
-  bool ret = tinyobj::LoadObj(&attrib, &shapes, &materials, &err, "../models/mtllib-multiple-files-issue-112.obj", gMtlBasePath);
+  bool ret = tinyobj::LoadObj(&attrib, &shapes, &materials, &warn, &err,
+                              "../models/mtllib-multiple-files-issue-112.obj",
+                              gMtlBasePath);
+
+  if (!warn.empty()) {
+    std::cout << "WARN: " << warn << std::endl;
+  }
 
   if (!err.empty()) {
-    std::cerr << err << std::endl;
+    std::cerr << "ERR: " << err << std::endl;
   }
   REQUIRE(true == ret);
   REQUIRE(1 == materials.size());
@@ -552,11 +637,17 @@ TEST_CASE("tr_and_d", "[Issue43]") {
   std::vector<tinyobj::shape_t> shapes;
   std::vector<tinyobj::material_t> materials;
 
+  std::string warn;
   std::string err;
-  bool ret = tinyobj::LoadObj(&attrib, &shapes, &materials, &err, "../models/tr-and-d-issue-43.obj", gMtlBasePath);
+  bool ret = tinyobj::LoadObj(&attrib, &shapes, &materials, &warn, &err,
+                              "../models/tr-and-d-issue-43.obj", gMtlBasePath);
+
+  if (!warn.empty()) {
+    std::cout << "WARN: " << warn << std::endl;
+  }
 
   if (!err.empty()) {
-    std::cerr << err << std::endl;
+    std::cerr << "ERR: " << err << std::endl;
   }
   REQUIRE(true == ret);
   REQUIRE(2 == materials.size());
@@ -570,11 +661,17 @@ TEST_CASE("refl", "[refl]") {
   std::vector<tinyobj::shape_t> shapes;
   std::vector<tinyobj::material_t> materials;
 
+  std::string warn;
   std::string err;
-  bool ret = tinyobj::LoadObj(&attrib, &shapes, &materials, &err, "../models/refl.obj", gMtlBasePath);
+  bool ret = tinyobj::LoadObj(&attrib, &shapes, &materials, &warn, &err,
+                              "../models/refl.obj", gMtlBasePath);
+
+  if (!warn.empty()) {
+    std::cout << "WARN: " << warn << std::endl;
+  }
 
   if (!err.empty()) {
-    std::cerr << err << std::endl;
+    std::cerr << "ERR: " << err << std::endl;
   }
 
   PrintInfo(attrib, shapes, materials);
@@ -590,11 +687,17 @@ TEST_CASE("map_Bump", "[bump]") {
   std::vector<tinyobj::shape_t> shapes;
   std::vector<tinyobj::material_t> materials;
 
+  std::string warn;
   std::string err;
-  bool ret = tinyobj::LoadObj(&attrib, &shapes, &materials, &err, "../models/map-bump.obj", gMtlBasePath);
+  bool ret = tinyobj::LoadObj(&attrib, &shapes, &materials, &warn, &err,
+                              "../models/map-bump.obj", gMtlBasePath);
+
+  if (!warn.empty()) {
+    std::cout << "WARN: " << warn << std::endl;
+  }
 
   if (!err.empty()) {
-    std::cerr << err << std::endl;
+    std::cerr << "ERR: " << err << std::endl;
   }
 
   PrintInfo(attrib, shapes, materials);
@@ -610,11 +713,17 @@ TEST_CASE("g_ignored", "[Issue138]") {
   std::vector<tinyobj::shape_t> shapes;
   std::vector<tinyobj::material_t> materials;
 
+  std::string warn;
   std::string err;
-  bool ret = tinyobj::LoadObj(&attrib, &shapes, &materials, &err, "../models/issue-138.obj", gMtlBasePath);
+  bool ret = tinyobj::LoadObj(&attrib, &shapes, &materials, &warn, &err,
+                              "../models/issue-138.obj", gMtlBasePath);
+
+  if (!warn.empty()) {
+    std::cout << "WARN: " << warn << std::endl;
+  }
 
   if (!err.empty()) {
-    std::cerr << err << std::endl;
+    std::cerr << "ERR: " << err << std::endl;
   }
 
   PrintInfo(attrib, shapes, materials);
@@ -622,7 +731,6 @@ TEST_CASE("g_ignored", "[Issue138]") {
   REQUIRE(true == ret);
   REQUIRE(2 == shapes.size());
   REQUIRE(2 == materials.size());
-
 }
 
 TEST_CASE("vertex-col-ext", "[Issue144]") {
@@ -630,15 +738,21 @@ TEST_CASE("vertex-col-ext", "[Issue144]") {
   std::vector<tinyobj::shape_t> shapes;
   std::vector<tinyobj::material_t> materials;
 
+  std::string warn;
   std::string err;
 
-  bool ret = tinyobj::LoadObj(&attrib, &shapes, &materials, &err, "../models/cube-vertexcol.obj", gMtlBasePath);
+  bool ret = tinyobj::LoadObj(&attrib, &shapes, &materials, &warn, &err,
+                              "../models/cube-vertexcol.obj", gMtlBasePath);
 
-  if (!err.empty()) {
+  if (!warn.empty()) {
-    std::cerr << err << std::endl;
+    std::cout << "WARN: " << warn << std::endl;
   }
 
-  //PrintInfo(attrib, shapes, materials);
+  if (!err.empty()) {
+    std::cerr << "ERR: " << err << std::endl;
+  }
+
+  // PrintInfo(attrib, shapes, materials);
 
   REQUIRE(true == ret);
   REQUIRE((8 * 3) == attrib.colors.size());
@@ -663,18 +777,23 @@ TEST_CASE("norm_texopts", "[norm]") {
   std::vector<tinyobj::shape_t> shapes;
   std::vector<tinyobj::material_t> materials;
 
+  std::string warn;
   std::string err;
-  bool ret = tinyobj::LoadObj(&attrib, &shapes, &materials, &err, "../models/norm-texopt.obj", gMtlBasePath);
+  bool ret = tinyobj::LoadObj(&attrib, &shapes, &materials, &warn, &err,
+                              "../models/norm-texopt.obj", gMtlBasePath);
+
+  if (!warn.empty()) {
+    std::cout << "WARN: " << warn << std::endl;
+  }
 
   if (!err.empty()) {
-    std::cerr << err << std::endl;
+    std::cerr << "ERR: " << err << std::endl;
   }
 
   REQUIRE(true == ret);
   REQUIRE(1 == shapes.size());
   REQUIRE(1 == materials.size());
   REQUIRE(3.0 == Approx(materials[0].normal_texopt.bump_multiplier));
-
 }
 
 TEST_CASE("zero-face-idx-value", "[Issue140]") {
@@ -682,16 +801,21 @@ TEST_CASE("zero-face-idx-value", "[Issue140]") {
   std::vector<tinyobj::shape_t> shapes;
   std::vector<tinyobj::material_t> materials;
 
+  std::string warn;
   std::string err;
-  bool ret = tinyobj::LoadObj(&attrib, &shapes, &materials, &err, "../models/issue-140-zero-face-idx.obj", gMtlBasePath);
+  bool ret =
+      tinyobj::LoadObj(&attrib, &shapes, &materials, &warn, &err,
+                       "../models/issue-140-zero-face-idx.obj", gMtlBasePath);
 
+  if (!warn.empty()) {
+    std::cout << "WARN: " << warn << std::endl;
+  }
 
   if (!err.empty()) {
-    std::cerr << err << std::endl;
+    std::cerr << "ERR: " << err << std::endl;
   }
   REQUIRE(false == ret);
   REQUIRE(!err.empty());
-
 }
 
 TEST_CASE("texture-name-whitespace", "[Issue145]") {
@@ -699,12 +823,18 @@ TEST_CASE("texture-name-whitespace", "[Issue145]") {
   std::vector<tinyobj::shape_t> shapes;
   std::vector<tinyobj::material_t> materials;
 
+  std::string warn;
   std::string err;
-  bool ret = tinyobj::LoadObj(&attrib, &shapes, &materials, &err, "../models/texture-filename-with-whitespace.obj", gMtlBasePath);
+  bool ret = tinyobj::LoadObj(&attrib, &shapes, &materials, &warn, &err,
+                              "../models/texture-filename-with-whitespace.obj",
+                              gMtlBasePath);
 
+  if (!warn.empty()) {
+    std::cout << "WARN: " << warn << std::endl;
+  }
 
   if (!err.empty()) {
-    std::cerr << "[Issue145] " << err << std::endl;
+    std::cerr << "ERR: " << err << std::endl;
   }
 
   REQUIRE(true == ret);
@@ -714,9 +844,204 @@ TEST_CASE("texture-name-whitespace", "[Issue145]") {
   REQUIRE(0 == materials[0].diffuse_texname.compare("texture 01.png"));
   REQUIRE(0 == materials[1].bump_texname.compare("bump 01.png"));
   REQUIRE(2 == Approx(materials[1].bump_texopt.bump_multiplier));
-
 }
 
+TEST_CASE("smoothing-group", "[Issue162]") {
+  tinyobj::attrib_t attrib;
+  std::vector<tinyobj::shape_t> shapes;
+  std::vector<tinyobj::material_t> materials;
+
+  std::string warn;
+  std::string err;
+  bool ret =
+      tinyobj::LoadObj(&attrib, &shapes, &materials, &warn, &err,
+                       "../models/issue-162-smoothing-group.obj", gMtlBasePath);
+
+  if (!warn.empty()) {
+    std::cout << "WARN: " << warn << std::endl;
+  }
+
+  if (!err.empty()) {
+    std::cerr << "ERR: " << err << std::endl;
+  }
+
+  REQUIRE(true == ret);
+  REQUIRE(2 == shapes.size());
+
+  REQUIRE(2 == shapes[0].mesh.smoothing_group_ids.size());
+  REQUIRE(1 == shapes[0].mesh.smoothing_group_ids[0]);
+  REQUIRE(1 == shapes[0].mesh.smoothing_group_ids[1]);
+
+  REQUIRE(10 == shapes[1].mesh.smoothing_group_ids.size());
+  REQUIRE(0 == shapes[1].mesh.smoothing_group_ids[0]);
+  REQUIRE(0 == shapes[1].mesh.smoothing_group_ids[1]);
+  REQUIRE(3 == shapes[1].mesh.smoothing_group_ids[2]);
+  REQUIRE(3 == shapes[1].mesh.smoothing_group_ids[3]);
+  REQUIRE(4 == shapes[1].mesh.smoothing_group_ids[4]);
+  REQUIRE(4 == shapes[1].mesh.smoothing_group_ids[5]);
+  REQUIRE(0 == shapes[1].mesh.smoothing_group_ids[6]);
+  REQUIRE(0 == shapes[1].mesh.smoothing_group_ids[7]);
+  REQUIRE(6 == shapes[1].mesh.smoothing_group_ids[8]);
+  REQUIRE(6 == shapes[1].mesh.smoothing_group_ids[9]);
+}
+
+TEST_CASE("invalid-face-definition", "[face]") {
+  tinyobj::attrib_t attrib;
+  std::vector<tinyobj::shape_t> shapes;
+  std::vector<tinyobj::material_t> materials;
+
+  std::string warn;
+  std::string err;
+  bool ret =
+      tinyobj::LoadObj(&attrib, &shapes, &materials, &warn, &err,
+                       "../models/invalid-face-definition.obj", gMtlBasePath);
+
+  if (!warn.empty()) {
+    std::cout << "WARN: " << warn << std::endl;
+  }
+
+  if (!err.empty()) {
+    std::cerr << "ERR: " << err << std::endl;
+  }
+
+  REQUIRE(true == ret);
+  REQUIRE(1 == shapes.size());
+  REQUIRE(0 == shapes[0].mesh.indices.size());
+}
+
+TEST_CASE("Empty mtl basedir", "[Issue177]") {
+  tinyobj::attrib_t attrib;
+  std::vector<tinyobj::shape_t> shapes;
+  std::vector<tinyobj::material_t> materials;
+
+  std::string warn;
+  std::string err;
+
+  // A case where the user explicitly provides an empty string
+  // Win32 specific?
+  const char* userBaseDir = "";
+  bool ret = tinyobj::LoadObj(&attrib, &shapes, &materials, &warn, &err,
+                              "issue-177.obj", userBaseDir);
+
+  // if mtl loading fails, we get an warning message here
+  ret &= warn.empty();
+
+  if (!warn.empty()) {
+    std::cout << "WARN: " << warn << std::endl;
+  }
+
+  if (!err.empty()) {
+    std::cerr << "ERR: " << err << std::endl;
+  }
+
+  REQUIRE(true == ret);
+}
+
+TEST_CASE("line-primitive", "[line]") {
+  tinyobj::attrib_t attrib;
+  std::vector<tinyobj::shape_t> shapes;
+  std::vector<tinyobj::material_t> materials;
+
+  std::string warn;
+  std::string err;
+  bool ret = tinyobj::LoadObj(&attrib, &shapes, &materials, &warn, &err,
+                              "../models/line-prim.obj", gMtlBasePath);
+
+  if (!warn.empty()) {
+    std::cout << "WARN: " << warn << std::endl;
+  }
+
+  if (!err.empty()) {
+    std::cerr << "ERR: " << err << std::endl;
+  }
+
+  REQUIRE(true == ret);
+  REQUIRE(1 == shapes.size());
+  REQUIRE(6 == shapes[0].path.indices.size());
+}
+
+TEST_CASE("multiple-group-names", "[group]") {
+  tinyobj::attrib_t attrib;
+  std::vector<tinyobj::shape_t> shapes;
+  std::vector<tinyobj::material_t> materials;
+
+  std::string warn;
+  std::string err;
+  bool ret = tinyobj::LoadObj(&attrib, &shapes, &materials, &warn, &err,
+                              "../models/cube.obj", gMtlBasePath);
+
+  if (!warn.empty()) {
+    std::cout << "WARN: " << warn << std::endl;
+  }
+
+  if (!err.empty()) {
+    std::cerr << "ERR: " << err << std::endl;
+  }
+
+  REQUIRE(true == ret);
+  REQUIRE(6 == shapes.size());
+  REQUIRE(0 == shapes[0].name.compare("front cube"));
+  REQUIRE(0 == shapes[1].name.compare("back cube"));  // multiple whitespaces
+                                                      // are aggregated as
+                                                      // single white space.
+}
+
+TEST_CASE("colorspace", "[Issue184]") {
+  tinyobj::attrib_t attrib;
+  std::vector<tinyobj::shape_t> shapes;
+  std::vector<tinyobj::material_t> materials;
+
+  std::string warn;
+  std::string err;
+  bool ret =
+      tinyobj::LoadObj(&attrib, &shapes, &materials, &warn, &err,
+                       "../models/colorspace-issue-184.obj", gMtlBasePath);
+
+  if (!warn.empty()) {
+    std::cout << "WARN: " << warn << std::endl;
+  }
+
+  if (!err.empty()) {
+    std::cerr << "ERR: " << err << std::endl;
+  }
+
+  REQUIRE(true == ret);
+  REQUIRE(1 == shapes.size());
+  REQUIRE(1 == materials.size());
+  REQUIRE(0 == materials[0].diffuse_texopt.colorspace.compare("sRGB"));
+  REQUIRE(0 == materials[0].specular_texopt.colorspace.size());
+  REQUIRE(0 == materials[0].bump_texopt.colorspace.compare("linear"));
+}
+
+// Fuzzer test.
+// Just check if it does not crash.
+// Disable by default since Windows filesystem can't create filename of afl
+// testdata
+#if 0 
+
+TEST_CASE("afl000000", "[AFL]") {
+  tinyobj::attrib_t attrib;
+  std::vector<tinyobj::shape_t> shapes;
+  std::vector<tinyobj::material_t> materials;
+
+  std::string err;
+  bool ret = tinyobj::LoadObj(&attrib, &shapes, &materials, &err, "./afl/id:000000,sig:11,src:000000,op:havoc,rep:128", gMtlBasePath);
+
+  REQUIRE(true == ret);
+}
+
+TEST_CASE("afl000001", "[AFL]") {
+  tinyobj::attrib_t attrib;
+  std::vector<tinyobj::shape_t> shapes;
+  std::vector<tinyobj::material_t> materials;
+
+  std::string err;
+  bool ret = tinyobj::LoadObj(&attrib, &shapes, &materials, &err, "./afl/id:000001,sig:11,src:000000,op:havoc,rep:64", gMtlBasePath);
+
+  REQUIRE(true == ret);
+}
+#endif
+
 #if 0
 int
 main(