Fix build on MSC + CXX11 codepath.

examples/obj_sticher/obj_writer.cc

@@ -172,3 +172,5 @@ bool WriteObj(const std::string& filename, const std::vector<tinyobj::shape_t>&
 
   return ret;
 }
+
+

examples/viewer/viewer.cc

@@ -191,90 +191,9 @@ 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
-{
-	void addBtoA(float a[3], float b[3])
-	{
-		for (size_t i = 0; i < 3; ++i)
-			a[i] += b[i];
-	}
-
-	void assignBtoA(float a[3], float b[3])
-	{
-		for (size_t i = 0; i < 3; ++i)
-			a[i] = b[i];
-	}
-
-	void normalizeVector(float N[3])
-	{
-		float len2 = N[0] * N[0] + N[1] * N[1] + N[2] * N[2];
-		if (len2 > 0.0f) {
-			float len = sqrtf(len2);
-
-			N[0] /= len;
-			N[1] /= len;
-			N[2] /= len;
-		}
-	}
-
-	void computeSmoothingNormals(tinyobj::attrib_t &attrib, tinyobj::shape_t &shape,
-		std::map<int, float[3]>& smoothVertexNormals)
-	{
-		smoothVertexNormals.clear();
-		std::map<int, float[3]>::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())
-					addBtoA(iter->second, normal);
-				else
-					assignBtoA(smoothVertexNormals[vi[i]], normal);
-			}
-
-		} // 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,
@@ -298,8 +217,8 @@ static bool LoadObjAndConvert(float bmin[3], float bmax[3],
 #endif
 
   std::string err;
-  bool ret = tinyobj::LoadObj(&attrib, &shapes, &materials, &err, filename,
-                              base_dir.c_str());
+  bool ret =
+      tinyobj::LoadObj(&attrib, &shapes, &materials, &err, filename, base_dir.c_str());
   if (!err.empty()) {
     std::cerr << err << std::endl;
   }
@@ -323,8 +242,7 @@ 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
@@ -344,32 +262,27 @@ 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);
-          } 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_RGB, w, h, 0, GL_RGB, GL_UNSIGNED_BYTE, image);
+                  }
+                  else if (comp == 4) {
+                      glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, w, h, 0, GL_RGBA, GL_UNSIGNED_BYTE, image);
                   } else {
                       assert(0); // TODO
                   }
@@ -388,12 +301,6 @@ 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, float[3]> smoothVertexNormals;
-	  if (shapes[s].smoothingGroupId > 0)
-		  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];
@@ -401,16 +308,12 @@ 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()) {
-        //    std::cerr << "Invalid material index: " << current_material_id <<
-        //    std::endl;
+        //    std::cerr << "Invalid material index: " << current_material_id << std::endl;
         //}
         //
         float diffuse[3];
@@ -419,22 +322,9 @@ static bool LoadObjAndConvert(float bmin[3], float bmax[3],
         }
         float tc[3][2];
         if (attrib.texcoords.size() > 0) {
-          if ((idx0.texcoord_index < 0) || (idx1.texcoord_index < 0) ||
-              (idx2.texcoord_index < 0)) {
-            // 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));
+            assert(attrib.texcoords.size() > 2 * idx0.texcoord_index + 1);
+            assert(attrib.texcoords.size() > 2 * idx1.texcoord_index + 1);
+            assert(attrib.texcoords.size() > 2 * idx2.texcoord_index + 1);
 
             // Flip Y coord.
             tc[0][0] = attrib.texcoords[2 * idx0.texcoord_index];
@@ -443,7 +333,6 @@ 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;
@@ -474,45 +363,19 @@ static bool LoadObjAndConvert(float bmin[3], float bmax[3],
         }
 
         float n[3][3];
-        {
-          bool invalid_normal_index = false;
         if (attrib.normals.size() > 0) {
-            int nf0 = idx0.normal_index;
-            int nf1 = idx1.normal_index;
-            int nf2 = idx2.normal_index;
-
-            if ((nf0 < 0) || (nf1 < 0) || (nf2 < 0)) {
-              // normal index is missing from this face.
-              invalid_normal_index = true;
-            } else {
+          int f0 = idx0.normal_index;
+          int f1 = idx1.normal_index;
+          int f2 = idx2.normal_index;
+          assert(f0 >= 0);
+          assert(f1 >= 0);
+          assert(f2 >= 0);
           for (int k = 0; k < 3; k++) {
-                assert(size_t(3 * nf0 + k) < attrib.normals.size());
-                assert(size_t(3 * nf1 + k) < attrib.normals.size());
-                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];
-              }
+            n[0][k] = attrib.normals[3 * f0 + k];
+            n[1][k] = attrib.normals[3 * f1 + k];
+            n[2][k] = attrib.normals[3 * f2 + 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) {
-			  assignBtoA(n[0], smoothVertexNormals[f0]);
-			  assignBtoA(n[1], smoothVertexNormals[f1]);
-			  assignBtoA(n[2], smoothVertexNormals[f2]);
-			  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];
@@ -522,7 +385,6 @@ 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]);
@@ -534,9 +396,11 @@ 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] = {n[k][0] * normal_factor + diffuse[0] * diffuse_factor,
+          float c[3] = {
+              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);
@@ -558,10 +422,8 @@ 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) {
-        o.material_id = shapes[s].mesh.material_ids[0];  // use the material ID
-                                                         // of the first face.
+      if (shapes[s].mesh.material_ids.size() > 0 && 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.
       }
@@ -570,10 +432,9 @@ 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), GL_STATIC_DRAW);
-        o.numTriangles = buffer.size() / (3 + 3 + 3 + 2) /
-                         3;  // 3:vtx, 3:normal, 3:col, 2:texcoord
+        glBufferData(GL_ARRAY_BUFFER, buffer.size() * sizeof(float), &buffer.at(0),
+                     GL_STATIC_DRAW);
+        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);
@@ -688,9 +549,7 @@ 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);
 
@@ -809,8 +668,7 @@ 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;
   }
 

loader_example.cc

@@ -29,10 +29,10 @@ extern "C" {
 #endif
 #endif
 
+#ifdef TINYOBJ_USE_CXX11
 #ifdef __clang__
 #pragma clang diagnostic push
-#if __has_warning("-Wzero-as-null-pointer-constant")
-#pragma clang diagnostic ignored "-Wzero-as-null-pointer-constant"
+#pragma clang diagnostic ignored "-Wc++98-compat"
 #endif
 #endif
 
@@ -70,7 +70,7 @@ class timerutil {
   }
   time_t current() {
     struct timeval t;
-    gettimeofday(&t, NULL);
+    gettimeofday(&t, tobj_null);
     return static_cast<time_t>(t.tv_sec * 1000 + t.tv_usec);
   }
 
@@ -268,7 +268,7 @@ static void PrintInfo(const tinyobj::attrib_t& attrib,
   }
 }
 
-static bool TestLoadObj(const char* filename, const char* basepath = NULL,
+static bool TestLoadObj(const char* filename, const char* basepath = tobj_null,
                         bool triangulate = true) {
   std::cout << "Loading " << filename << std::endl;
 

models/issue-161-inconsistent-f.obj

@@ -1,37 +0,0 @@
-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

@@ -1,23 +0,0 @@
-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

@@ -1,51 +0,0 @@
-
-# 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

tests/tester.cc

@@ -717,40 +717,6 @@ TEST_CASE("texture-name-whitespace", "[Issue145]") {
 
 }
 
-TEST_CASE("smoothing-group", "[Issue162]") {
-  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, "../models/issue-162-smoothing-group.obj", gMtlBasePath);
-
-  
-  if (!err.empty()) {
-    std::cerr << "[Issue162] " << 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]);
-
-}
-
 #if 0
 int
 main(

tiny_obj_loader.h

@@ -51,12 +51,31 @@ THE SOFTWARE.
 
 namespace tinyobj {
 
+//
+// Please define `TINYOBJ_USE_CXX11` flag when you compile tinyobjloader with C++11 compiler.
+//
+#ifdef TINYOBJ_USE_CXX11
+#if defined(_MSC_VER)
+#  if _MSC_VER < 1800
+#    error This project needs at least Visual Studio 2013
+#  endif
+#define tobj_null nullptr
+#elif __cplusplus <= 199711L
+#  error This project can only be compiled with a compiler that supports C++11
+#else
+
 #ifdef __clang__
 #pragma clang diagnostic push
-#if __has_warning("-Wzero-as-null-pointer-constant")
-#pragma clang diagnostic ignored "-Wzero-as-null-pointer-constant"
+#pragma clang diagnostic ignored "-Wc++98-compat"
 #endif
+
+#define tobj_null nullptr
+
 #endif
+#else // !TINYOBJ_USE_CXX11
+#define tobj_null NULL
+#endif
+
 
 // https://en.wikipedia.org/wiki/Wavefront_.obj_file says ...
 //
@@ -225,9 +244,6 @@ typedef struct {
                                                  // face. 3 = polygon, 4 = quad,
                                                  // ... Up to 255.
   std::vector<int> material_ids;                 // per-face material ID
-  std::vector<unsigned int> smoothing_group_ids;  // per-face smoothing group
-                                                  // ID(0 = off. positive value
-                                                  // = group id)
   std::vector<tag_t> tags;                       // SubD tag
 } mesh_t;
 
@@ -269,14 +285,14 @@ typedef struct callback_t_ {
   void (*object_cb)(void *user_data, const char *name);
 
   callback_t_()
-      : vertex_cb(NULL),
-        normal_cb(NULL),
-        texcoord_cb(NULL),
-        index_cb(NULL),
-        usemtl_cb(NULL),
-        mtllib_cb(NULL),
-        group_cb(NULL),
-        object_cb(NULL) {}
+      : vertex_cb(tobj_null),
+        normal_cb(tobj_null),
+        texcoord_cb(tobj_null),
+        index_cb(tobj_null),
+        usemtl_cb(tobj_null),
+        mtllib_cb(tobj_null),
+        group_cb(tobj_null),
+        object_cb(tobj_null) {}
 } callback_t;
 
 class MaterialReader {
@@ -328,7 +344,7 @@ class MaterialStreamReader : public MaterialReader {
 /// or not.
 bool LoadObj(attrib_t *attrib, std::vector<shape_t> *shapes,
              std::vector<material_t> *materials, std::string *err,
-             const char *filename, const char *mtl_basedir = NULL,
+             const char *filename, const char *mtl_basedir = tobj_null,
              bool triangulate = true);
 
 /// Loads .obj from a file with custom user callback.
@@ -338,9 +354,9 @@ bool LoadObj(attrib_t *attrib, std::vector<shape_t> *shapes,
 /// Returns warning and error message into `err`
 /// See `examples/callback_api/` for how to use this function.
 bool LoadObjWithCallback(std::istream &inStream, const callback_t &callback,
-                         void *user_data = NULL,
-                         MaterialReader *readMatFn = NULL,
-                         std::string *err = NULL);
+                         void *user_data = tobj_null,
+                         MaterialReader *readMatFn = tobj_null,
+                         std::string *err = tobj_null);
 
 /// Loads object from a std::istream, uses GetMtlIStreamFn to retrieve
 /// std::istream for materials.
@@ -348,7 +364,7 @@ bool LoadObjWithCallback(std::istream &inStream, const callback_t &callback,
 /// Returns warning and error message into `err`
 bool LoadObj(attrib_t *attrib, std::vector<shape_t> *shapes,
              std::vector<material_t> *materials, std::string *err,
-             std::istream *inStream, MaterialReader *readMatFn = NULL,
+             std::istream *inStream, MaterialReader *readMatFn = tobj_null,
              bool triangulate = true);
 
 /// Loads materials into std::map
@@ -358,6 +374,10 @@ void LoadMtl(std::map<std::string, int> *material_map,
 
 }  // namespace tinyobj
 
+#ifdef __clang__
+#pragma clang diagnostic pop
+#endif
+
 #endif  // TINY_OBJ_LOADER_H_
 
 #ifdef TINYOBJLOADER_IMPLEMENTATION
@@ -374,27 +394,23 @@ void LoadMtl(std::map<std::string, int> *material_map,
 
 namespace tinyobj {
 
+#ifdef TINYOBJ_USE_CXX11
+#ifdef __clang__
+#pragma clang diagnostic push
+#pragma clang diagnostic ignored "-Wc++98-compat"
+#endif
+#endif
+
 MaterialReader::~MaterialReader() {}
 
-struct vertex_index_t {
+struct vertex_index {
   int v_idx, vt_idx, vn_idx;
-  vertex_index_t() : v_idx(-1), vt_idx(-1), vn_idx(-1) {}
-  explicit vertex_index_t(int idx) : v_idx(idx), vt_idx(idx), vn_idx(idx) {}
-  vertex_index_t(int vidx, int vtidx, int vnidx)
+  vertex_index() : v_idx(-1), vt_idx(-1), vn_idx(-1) {}
+  explicit vertex_index(int idx) : v_idx(idx), vt_idx(idx), vn_idx(idx) {}
+  vertex_index(int vidx, int vtidx, int vnidx)
       : v_idx(vidx), vt_idx(vtidx), vn_idx(vnidx) {}
 };
 
-// Internal data structure for face representation
-// index + smoothing group.
-struct face_t {
-  unsigned int
-      smoothing_group_id;  // smoothing group id. 0 = smoothing groupd is off.
-  int pad_;
-  std::vector<vertex_index_t> vertex_indices;  // face vertex indices.
-
-  face_t() : smoothing_group_id(0) {}
-};
-
 struct tag_sizes {
   tag_sizes() : num_ints(0), num_reals(0), num_strings(0) {}
   int num_ints;
@@ -682,10 +698,9 @@ static inline void parseV(real_t *x, real_t *y, real_t *z, real_t *w,
 }
 
 // Extension: parse vertex with colors(6 items)
-static inline bool parseVertexWithColor(real_t *x, real_t *y, real_t *z,
-                                        real_t *r, real_t *g, real_t *b,
-                                        const char **token,
-                                        const double default_x = 0.0,
+static inline bool parseVertexWithColor(real_t *x, real_t *y, real_t *z, real_t *r,
+                          real_t *g, real_t *b,
+                          const char **token, const double default_x = 0.0,
                           const double default_y = 0.0,
                           const double default_z = 0.0) {
   (*x) = parseReal(token, default_x);
@@ -767,12 +782,12 @@ static tag_sizes parseTagTriple(const char **token) {
 
 // Parse triples with index offsets: i, i/j/k, i//k, i/j
 static bool parseTriple(const char **token, int vsize, int vnsize, int vtsize,
-                        vertex_index_t *ret) {
+                        vertex_index *ret) {
   if (!ret) {
     return false;
   }
 
-  vertex_index_t vi(-1);
+  vertex_index vi(-1);
 
   if (!fixIndex(atoi((*token)), vsize, &(vi.v_idx))) {
     return false;
@@ -820,8 +835,8 @@ static bool parseTriple(const char **token, int vsize, int vnsize, int vtsize,
 }
 
 // Parse raw triples: i, i/j/k, i//k, i/j
-static vertex_index_t parseRawTriple(const char **token) {
-  vertex_index_t vi(static_cast<int>(0));  // 0 is an invalid index in OBJ
+static vertex_index parseRawTriple(const char **token) {
+  vertex_index vi(static_cast<int>(0));  // 0 is an invalid index in OBJ
 
   vi.v_idx = atoi((*token));
   (*token) += strcspn((*token), "/ \t\r");
@@ -993,181 +1008,30 @@ static void InitMaterial(material_t *material) {
   material->unknown_parameter.clear();
 }
 
-// code from https://wrf.ecse.rpi.edu//Research/Short_Notes/pnpoly.html
-static int pnpoly(int nvert, float *vertx, float *verty, float testx,
-                  float testy) {
-  int i, j, c = 0;
-  for (i = 0, j = nvert - 1; i < nvert; j = i++) {
-    if (((verty[i] > testy) != (verty[j] > testy)) &&
-        (testx <
-         (vertx[j] - vertx[i]) * (testy - verty[i]) / (verty[j] - verty[i]) +
-             vertx[i]))
-      c = !c;
-  }
-  return c;
-}
-
-// TODO(syoyo): refactor function.
-static bool exportFaceGroupToShape(shape_t *shape,
-                                   const std::vector<face_t> &faceGroup,
-                                   const std::vector<tag_t> &tags,
-                                   const int material_id,
-                                   const std::string &name, bool triangulate,
-                                   const std::vector<real_t> &v) {
+static bool exportFaceGroupToShape(
+    shape_t *shape, const std::vector<std::vector<vertex_index> > &faceGroup,
+    const std::vector<tag_t> &tags, const int material_id,
+    const std::string &name, bool triangulate) {
   if (faceGroup.empty()) {
     return false;
   }
 
   // Flatten vertices and indices
   for (size_t i = 0; i < faceGroup.size(); i++) {
-    const face_t &face = faceGroup[i];
+    const std::vector<vertex_index> &face = faceGroup[i];
 
-    vertex_index_t i0 = face.vertex_indices[0];
-    vertex_index_t i1(-1);
-    vertex_index_t i2 = face.vertex_indices[1];
+    vertex_index i0 = face[0];
+    vertex_index i1(-1);
+    vertex_index i2 = face[1];
 
-    size_t npolys = face.vertex_indices.size();
+    size_t npolys = face.size();
 
     if (triangulate) {
-      // find the two axes to work in
-      size_t axes[2] = {1, 2};
-      for (size_t k = 0; k < npolys; ++k) {
-        i0 = face.vertex_indices[(k + 0) % npolys];
-        i1 = face.vertex_indices[(k + 1) % npolys];
-        i2 = face.vertex_indices[(k + 2) % npolys];
-        size_t vi0 = size_t(i0.v_idx);
-        size_t vi1 = size_t(i1.v_idx);
-        size_t vi2 = size_t(i2.v_idx);
-        real_t v0x = v[vi0 * 3 + 0];
-        real_t v0y = v[vi0 * 3 + 1];
-        real_t v0z = v[vi0 * 3 + 2];
-        real_t v1x = v[vi1 * 3 + 0];
-        real_t v1y = v[vi1 * 3 + 1];
-        real_t v1z = v[vi1 * 3 + 2];
-        real_t v2x = v[vi2 * 3 + 0];
-        real_t v2y = v[vi2 * 3 + 1];
-        real_t v2z = v[vi2 * 3 + 2];
-        real_t e0x = v1x - v0x;
-        real_t e0y = v1y - v0y;
-        real_t e0z = v1z - v0z;
-        real_t e1x = v2x - v1x;
-        real_t e1y = v2y - v1y;
-        real_t e1z = v2z - v1z;
-        float cx = std::fabs(e0y * e1z - e0z * e1y);
-        float cy = std::fabs(e0z * e1x - e0x * e1z);
-        float cz = std::fabs(e0x * e1y - e0y * e1x);
-        const float epsilon = 0.0001f;
-        if (cx > epsilon || cy > epsilon || cz > epsilon) {
-          // found a corner
-          if (cx > cy && cx > cz) {
-          } else {
-            axes[0] = 0;
-            if (cz > cx && cz > cy) axes[1] = 1;
-          }
-          break;
-        }
-      }
+      // Polygon -> triangle fan conversion
+      for (size_t k = 2; k < npolys; k++) {
+        i1 = i2;
+        i2 = face[k];
 
-      real_t area = 0;
-      for (size_t k = 0; k < npolys; ++k) {
-        i0 = face.vertex_indices[(k + 0) % npolys];
-        i1 = face.vertex_indices[(k + 1) % npolys];
-        size_t vi0 = size_t(i0.v_idx);
-        size_t vi1 = size_t(i1.v_idx);
-        real_t v0x = v[vi0 * 3 + axes[0]];
-        real_t v0y = v[vi0 * 3 + axes[1]];
-        real_t v1x = v[vi1 * 3 + axes[0]];
-        real_t v1y = v[vi1 * 3 + axes[1]];
-        area += (v0x * v1y - v0y * v1x) * 0.5f;
-      }
-
-      int maxRounds =
-          10;  // arbitrary max loop count to protect against unexpected errors
-
-      face_t remainingFace = face;  // copy
-      size_t guess_vert = 0;
-      vertex_index_t ind[3];
-      real_t vx[3];
-      real_t vy[3];
-      while (remainingFace.vertex_indices.size() > 3 && maxRounds > 0) {
-        npolys = remainingFace.vertex_indices.size();
-        if (guess_vert >= npolys) {
-          maxRounds -= 1;
-          guess_vert -= npolys;
-        }
-        for (size_t k = 0; k < 3; k++) {
-          ind[k] = remainingFace.vertex_indices[(guess_vert + k) % npolys];
-          size_t vi = size_t(ind[k].v_idx);
-          vx[k] = v[vi * 3 + axes[0]];
-          vy[k] = v[vi * 3 + axes[1]];
-        }
-        real_t e0x = vx[1] - vx[0];
-        real_t e0y = vy[1] - vy[0];
-        real_t e1x = vx[2] - vx[1];
-        real_t e1y = vy[2] - vy[1];
-        real_t cross = e0x * e1y - e0y * e1x;
-        // if an internal angle
-        if (cross * area < 0.0f) {
-          guess_vert += 1;
-          continue;
-        }
-
-        // check all other verts in case they are inside this triangle
-        bool overlap = false;
-        for (size_t otherVert = 3; otherVert < npolys; ++otherVert) {
-          size_t ovi = size_t(
-              remainingFace.vertex_indices[(guess_vert + otherVert) % npolys]
-                  .v_idx);
-          real_t tx = v[ovi * 3 + axes[0]];
-          real_t ty = v[ovi * 3 + axes[1]];
-          if (pnpoly(3, vx, vy, tx, ty)) {
-            overlap = true;
-            break;
-          }
-        }
-
-        if (overlap) {
-          guess_vert += 1;
-          continue;
-        }
-
-        // this triangle is an ear
-        {
-          index_t idx0, idx1, idx2;
-          idx0.vertex_index = ind[0].v_idx;
-          idx0.normal_index = ind[0].vn_idx;
-          idx0.texcoord_index = ind[0].vt_idx;
-          idx1.vertex_index = ind[1].v_idx;
-          idx1.normal_index = ind[1].vn_idx;
-          idx1.texcoord_index = ind[1].vt_idx;
-          idx2.vertex_index = ind[2].v_idx;
-          idx2.normal_index = ind[2].vn_idx;
-          idx2.texcoord_index = ind[2].vt_idx;
-
-          shape->mesh.indices.push_back(idx0);
-          shape->mesh.indices.push_back(idx1);
-          shape->mesh.indices.push_back(idx2);
-
-          shape->mesh.num_face_vertices.push_back(3);
-          shape->mesh.material_ids.push_back(material_id);
-          shape->mesh.smoothing_group_ids.push_back(face.smoothing_group_id);
-        }
-
-        // remove v1 from the list
-        size_t removed_vert_index = (guess_vert + 1) % npolys;
-        while (removed_vert_index + 1 < npolys) {
-          remainingFace.vertex_indices[removed_vert_index] =
-              remainingFace.vertex_indices[removed_vert_index + 1];
-          removed_vert_index += 1;
-        }
-        remainingFace.vertex_indices.pop_back();
-      }
-
-      if (remainingFace.vertex_indices.size() == 3) {
-        i0 = remainingFace.vertex_indices[0];
-        i1 = remainingFace.vertex_indices[1];
-        i2 = remainingFace.vertex_indices[2];
-        {
         index_t idx0, idx1, idx2;
         idx0.vertex_index = i0.v_idx;
         idx0.normal_index = i0.vn_idx;
@@ -1185,23 +1049,19 @@ static bool exportFaceGroupToShape(shape_t *shape,
 
         shape->mesh.num_face_vertices.push_back(3);
         shape->mesh.material_ids.push_back(material_id);
-          shape->mesh.smoothing_group_ids.push_back(face.smoothing_group_id);
-        }
       }
     } else {
       for (size_t k = 0; k < npolys; k++) {
         index_t idx;
-        idx.vertex_index = face.vertex_indices[k].v_idx;
-        idx.normal_index = face.vertex_indices[k].vn_idx;
-        idx.texcoord_index = face.vertex_indices[k].vt_idx;
+        idx.vertex_index = face[k].v_idx;
+        idx.normal_index = face[k].vn_idx;
+        idx.texcoord_index = face[k].vt_idx;
         shape->mesh.indices.push_back(idx);
       }
 
       shape->mesh.num_face_vertices.push_back(
           static_cast<unsigned char>(npolys));
       shape->mesh.material_ids.push_back(material_id);  // per face
-      shape->mesh.smoothing_group_ids.push_back(
-          face.smoothing_group_id);  // per face
     }
   }
 
@@ -1710,17 +1570,13 @@ bool LoadObj(attrib_t *attrib, std::vector<shape_t> *shapes,
   std::vector<real_t> vt;
   std::vector<real_t> vc;
   std::vector<tag_t> tags;
-  std::vector<face_t> faceGroup;
+  std::vector<std::vector<vertex_index> > faceGroup;
   std::string name;
 
   // material
   std::map<std::string, int> material_map;
   int material = -1;
 
-  // smoothing group id
-  unsigned int current_smoothing_id =
-      0;  // Initial value. 0 means no smoothing.
-
   shape_t shape;
 
   std::string linebuf;
@@ -1793,13 +1649,11 @@ bool LoadObj(attrib_t *attrib, std::vector<shape_t> *shapes,
       token += 2;
       token += strspn(token, " \t");
 
-      face_t face;
-
-      face.smoothing_group_id = current_smoothing_id;
-      face.vertex_indices.reserve(3);
+      std::vector<vertex_index> face;
+      face.reserve(3);
 
       while (!IS_NEW_LINE(token[0])) {
-        vertex_index_t vi;
+        vertex_index vi;
         if (!parseTriple(&token, static_cast<int>(v.size() / 3),
                          static_cast<int>(vn.size() / 3),
                          static_cast<int>(vt.size() / 2), &vi)) {
@@ -1809,13 +1663,14 @@ bool LoadObj(attrib_t *attrib, std::vector<shape_t> *shapes,
           return false;
         }
 
-        face.vertex_indices.push_back(vi);
+        face.push_back(vi);
         size_t n = strspn(token, " \t\r");
         token += n;
       }
 
       // replace with emplace_back + std::move on C++11
-      faceGroup.push_back(face);
+      faceGroup.push_back(std::vector<vertex_index>());
+      faceGroup[faceGroup.size() - 1].swap(face);
 
       continue;
     }
@@ -1839,7 +1694,7 @@ bool LoadObj(attrib_t *attrib, std::vector<shape_t> *shapes,
         // this time.
         // just clear `faceGroup` after `exportFaceGroupToShape()` call.
         exportFaceGroupToShape(&shape, faceGroup, tags, material, name,
-                               triangulate, v);
+                               triangulate);
         faceGroup.clear();
         material = newMaterialId;
       }
@@ -1894,7 +1749,7 @@ bool LoadObj(attrib_t *attrib, std::vector<shape_t> *shapes,
     if (token[0] == 'g' && IS_SPACE((token[1]))) {
       // flush previous face group.
       bool ret = exportFaceGroupToShape(&shape, faceGroup, tags, material, name,
-                                        triangulate, v);
+                                        triangulate);
       (void)ret;  // return value not used.
 
       if (shape.mesh.indices.size() > 0) {
@@ -1931,7 +1786,7 @@ bool LoadObj(attrib_t *attrib, std::vector<shape_t> *shapes,
     if (token[0] == 'o' && IS_SPACE((token[1]))) {
       // flush previous face group.
       bool ret = exportFaceGroupToShape(&shape, faceGroup, tags, material, name,
-                                        triangulate, v);
+                                        triangulate);
       if (ret) {
         shapes->push_back(shape);
       }
@@ -1975,49 +1830,13 @@ bool LoadObj(attrib_t *attrib, std::vector<shape_t> *shapes,
       }
 
       tags.push_back(tag);
-
-      continue;
     }
 
-    if (token[0] == 's' && IS_SPACE(token[1])) {
-      // smoothing group id
-      token += 2;
-
-      // skip space.
-      token += strspn(token, " \t");  // skip space
-
-      if (token[0] == '\0') {
-        continue;
-      }
-
-      if (token[0] == '\r' || token[1] == '\n') {
-        continue;
-      }
-
-      if (strlen(token) >= 3) {
-        if (token[0] == 'o' && token[1] == 'f' && token[2] == 'f') {
-          current_smoothing_id = 0;
-        }
-      } else {
-        // assume number
-        int smGroupId = parseInt(&token);
-        if (smGroupId < 0) {
-          // parse error. force set to 0.
-          // FIXME(syoyo): Report warning.
-          current_smoothing_id = 0;
-        } else {
-          current_smoothing_id = static_cast<unsigned int>(smGroupId);
-        }
-      }
-
-      continue;
-    }  // smoothing group id
-
     // Ignore unknown command.
   }
 
   bool ret = exportFaceGroupToShape(&shape, faceGroup, tags, material, name,
-                                    triangulate, v);
+                                    triangulate);
   // exportFaceGroupToShape return false when `usemtl` is called in the last
   // line.
   // we also add `shape` to `shapes` when `shape.mesh` has already some
@@ -2125,7 +1944,7 @@ bool LoadObjWithCallback(std::istream &inStream, const callback_t &callback,
 
       indices.clear();
       while (!IS_NEW_LINE(token[0])) {
-        vertex_index_t vi = parseRawTriple(&token);
+        vertex_index vi = parseRawTriple(&token);
 
         index_t idx;
         idx.vertex_index = vi.v_idx;
@@ -2248,7 +2067,7 @@ bool LoadObjWithCallback(std::istream &inStream, const callback_t &callback,
                             static_cast<int>(names_out.size()));
 
         } else {
-          callback.group_cb(user_data, NULL, 0);
+          callback.group_cb(user_data, tobj_null, 0);
         }
       }
 
@@ -2322,6 +2141,7 @@ bool LoadObjWithCallback(std::istream &inStream, const callback_t &callback,
 #ifdef __clang__
 #pragma clang diagnostic pop
 #endif
+
 }  // namespace tinyobj
 
 #endif