Add support for parsing 'illum' and 'd'/'Tr' statements.

test.cc

@@ -47,6 +47,8 @@ TestLoadObj(
     printf("  material.Ke = (%f, %f ,%f)\n", shapes[i].material.emission[0], shapes[i].material.emission[1], shapes[i].material.emission[2]);
     printf("  material.Ns = %f\n", shapes[i].material.shininess);
     printf("  material.Ni = %f\n", shapes[i].material.ior);
+    printf("  material.dissolve = %f\n", shapes[i].material.dissolve);
+    printf("  material.illum = %d\n", shapes[i].material.illum);
     printf("  material.map_Ka = %s\n", shapes[i].material.ambient_texname.c_str());
     printf("  material.map_Kd = %s\n", shapes[i].material.diffuse_texname.c_str());
     printf("  material.map_Ks = %s\n", shapes[i].material.specular_texname.c_str());

tiny_obj_loader.cc

@@ -88,6 +88,14 @@ static inline std::string parseString(const char*& token)
   return s;
 }
 
+static inline int parseInt(const char*& token)
+{
+  token += strspn(token, " \t");
+  int i = atoi(token);
+  token += strcspn(token, " \t\r");
+  return i;
+}
+
 static inline float parseFloat(const char*& token)
 {
   token += strspn(token, " \t");
@@ -269,6 +277,8 @@ void InitMaterial(material_t& material) {
     material.transmittance[i] = 0.f;
     material.emission[i] = 0.f;
   }
+  material.illum = 0;
+  material.dissolve = 1.f;
   material.shininess = 1.f;
   material.unknown_parameter.clear();
 }
@@ -411,6 +421,25 @@ std::string LoadMtl (
       continue;
     }
 
+    // illum model
+    if (0 == strncmp(token, "illum", 5) && isSpace(token[5])) {
+      token += 6;
+      material.illum = parseInt(token);
+      continue;
+    }
+
+    // dissolve
+    if ((token[0] == 'd' && isSpace(token[1]))) {
+      token += 1;
+      material.dissolve = parseFloat(token);
+      continue;
+    }
+    if (token[0] == 'T' && token[1] == 'r' && isSpace(token[2])) {
+      token += 2;
+      material.dissolve = parseFloat(token);
+      continue;
+    }
+
     // ambient texture
     if ((0 == strncmp(token, "map_Ka", 6)) && isSpace(token[6])) {
       token += 7;

tiny_obj_loader.h

@@ -23,6 +23,9 @@ typedef struct
     float emission[3];
     float shininess;
     float ior;                // index of refraction
+    float dissolve;           // 1 == opaque; 0 == fully transparent
+    // illumination model (see http://www.fileformat.info/format/material/)
+    int illum;
 
     std::string ambient_texname;
     std::string diffuse_texname;