Fix seg fault when no material assigned to object in viewer example.

Bump version v1.0.2.

examples/viewer/viewer.cc

@@ -209,6 +209,9 @@ bool LoadObjAndConvert(float bmin[3], float bmax[3],
   printf("# of materials = %d\n", (int)materials.size());
   printf("# of shapes    = %d\n", (int)shapes.size());
 
+  // Append `default` material
+  materials.push_back(tinyobj::material_t());
+
   // Load diffuse textures
   {
       for (size_t m = 0; m < materials.size(); m++) {
@@ -248,11 +251,6 @@ bool LoadObjAndConvert(float bmin[3], float bmax[3],
 
   {
     for (size_t s = 0; s < shapes.size(); s++) {
-      size_t current_material_id = 0;
-      if (shapes[s].mesh.material_ids.size() > 0 && shapes[s].mesh.material_ids.size() > s) {
-          // Base case
-          current_material_id = shapes[s].mesh.material_ids[s];
-      }
       DrawObject o;
       std::vector<float> vb;  // pos(3float), normal(3float), color(3float)
       for (size_t f = 0; f < shapes[s].mesh.indices.size() / 3; f++) {
@@ -260,12 +258,16 @@ bool LoadObjAndConvert(float bmin[3], float bmax[3],
         tinyobj::index_t idx1 = shapes[s].mesh.indices[3 * f + 1];
         tinyobj::index_t idx2 = shapes[s].mesh.indices[3 * f + 2];
         
-        current_material_id = shapes[s].mesh.material_ids[f];
+        int current_material_id = shapes[s].mesh.material_ids[f];
 
-        if (current_material_id >= materials.size()) {
+        if ((current_material_id < 0) || (current_material_id >= static_cast<int>(materials.size()))) {
-            std::cerr << "Invalid material index: " << current_material_id << std::endl;
+          // Invaid material ID. Use default material.
+          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;
+        //}
+        //
         float diffuse[3];
         for (size_t i = 0; i < 3; i++) {
             diffuse[i] = materials[current_material_id].diffuse[i];
@@ -364,7 +366,15 @@ bool LoadObjAndConvert(float bmin[3], float bmax[3],
 
       o.vb = 0;
       o.numTriangles = 0;
-      o.material_id = current_material_id;
+
+      // 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) {
+          // Base case
+          o.material_id = shapes[s].mesh.material_ids[s];
+      } else {
+          o.material_id = materials.size() - 1; // = ID for default material.
+      }
+          
       if (vb.size() > 0) {
         glGenBuffers(1, &o.vb);
         glBindBuffer(GL_ARRAY_BUFFER, o.vb);

loader_example.cc

@@ -236,13 +236,13 @@ static void PrintInfo(const tinyobj::attrib_t& attrib,
     printf("  material.map_d = %s\n", materials[i].alpha_texname.c_str());
     printf("  material.disp = %s\n", materials[i].displacement_texname.c_str());
     printf("  <<PBR>>\n");
-    printf("  material.Pr     = %f\n", materials[i].roughness);
+    printf("  material.Pr     = %f\n", static_cast<const double>(materials[i].roughness));
-    printf("  material.Pm     = %f\n", materials[i].metallic);
+    printf("  material.Pm     = %f\n", static_cast<const double>(materials[i].metallic));
-    printf("  material.Ps     = %f\n", materials[i].sheen);
+    printf("  material.Ps     = %f\n", static_cast<const double>(materials[i].sheen));
-    printf("  material.Pc     = %f\n", materials[i].clearcoat_thickness);
+    printf("  material.Pc     = %f\n", static_cast<const double>(materials[i].clearcoat_thickness));
-    printf("  material.Pcr    = %f\n", materials[i].clearcoat_thickness);
+    printf("  material.Pcr    = %f\n", static_cast<const double>(materials[i].clearcoat_thickness));
-    printf("  material.aniso  = %f\n", materials[i].anisotropy);
+    printf("  material.aniso  = %f\n", static_cast<const double>(materials[i].anisotropy));
-    printf("  material.anisor = %f\n", materials[i].anisotropy_rotation);
+    printf("  material.anisor = %f\n", static_cast<const double>(materials[i].anisotropy_rotation));
     printf("  material.map_Ke = %s\n", materials[i].emissive_texname.c_str());
     printf("  material.map_Pr = %s\n", materials[i].roughness_texname.c_str());
     printf("  material.map_Pm = %s\n", materials[i].metallic_texname.c_str());

tiny_obj_loader.h

@@ -23,6 +23,7 @@ THE SOFTWARE.
 */
 
 //
+// version 1.0.2 : Improve parsing speed by about a factor of 2 for large files(#105)
 // version 1.0.1 : Fixes a shape is lost if obj ends with a 'usemtl'(#104)
 // version 1.0.0 : Change data structure. Change license from BSD to MIT.
 //
@@ -75,6 +76,7 @@ typedef struct {
   float clearcoat_roughness;      // [0, 1] default 0
   float anisotropy;               // aniso. [0, 1] default 0
   float anisotropy_rotation;      // anisor. [0, 1] default 0
+  float pad0;
   std::string roughness_texname;  // map_Pr
   std::string metallic_texname;   // map_Pm
   std::string sheen_texname;      // map_Ps