Support specular highlight, bump, displacement and alpha texture(Remove non-standard "normal map"). Fixes #53.

test.cc

@@ -45,7 +45,10 @@ static void PrintInfo(const std::vector<tinyobj::shape_t>& shapes, const std::ve
     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].normal_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());
     std::map<std::string, std::string>::const_iterator it(materials[i].unknown_parameter.begin());
     std::map<std::string, std::string>::const_iterator itEnd(materials[i].unknown_parameter.end());
     for (; it != itEnd; it++) {

tiny_obj_loader.cc

@@ -5,6 +5,7 @@
 //
 
 //
+// version 0.9.14: Support specular highlight, bump, displacement and alpha map(#53)
 // version 0.9.13: Report "Material file not found message" in `err`(#46)
 // version 0.9.12: Fix groups being ignored if they have 'usemtl' just before 'g' (#44)
 // version 0.9.11: Invert `Tr` parameter(#43)
@@ -344,7 +345,10 @@ void InitMaterial(material_t &material) {
   material.ambient_texname = "";
   material.diffuse_texname = "";
   material.specular_texname = "";
-  material.normal_texname = "";
+  material.specular_highlight_texname = "";
+  material.bump_texname = "";
+  material.displacement_texname = "";
+  material.alpha_texname = "";
   for (int i = 0; i < 3; i++) {
     material.ambient[i] = 0.f;
     material.diffuse[i] = 0.f;
@@ -587,10 +591,38 @@ std::string LoadMtl(std::map<std::string, int> &material_map,
       continue;
     }
 
-    // normal texture
+    // specular highlight texture
     if ((0 == strncmp(token, "map_Ns", 6)) && isSpace(token[6])) {
       token += 7;
-      material.normal_texname = token;
+      material.specular_highlight_texname = token;
+      continue;
+    }
+
+    // bump texture
+    if ((0 == strncmp(token, "map_bump", 8)) && isSpace(token[8])) {
+      token += 9;
+      material.bump_texname = token;
+      continue;
+    }
+
+    // alpha texture
+    if ((0 == strncmp(token, "map_d", 5)) && isSpace(token[5])) {
+      token += 6;
+      material.bump_texname = token;
+      continue;
+    }
+
+    // bump texture
+    if ((0 == strncmp(token, "bump", 4)) && isSpace(token[4])) {
+      token += 5;
+      material.bump_texname = token;
+      continue;
+    }
+
+    // displacement texture
+    if ((0 == strncmp(token, "disp", 4)) && isSpace(token[4])) {
+      token += 5;
+      material.displacement_texname = token;
       continue;
     }
 

tiny_obj_loader.h

@@ -26,10 +26,13 @@ typedef struct {
   // illumination model (see http://www.fileformat.info/format/material/)
   int illum;
 
-  std::string ambient_texname;
+  std::string ambient_texname;            // map_Ka
-  std::string diffuse_texname;
+  std::string diffuse_texname;            // map_Kd
-  std::string specular_texname;
+  std::string specular_texname;           // map_Ks
-  std::string normal_texname;
+  std::string specular_highlight_texname; // map_Ns
+  std::string bump_texname;               // map_bump, bump
+  std::string displacement_texname;       // disp
+  std::string alpha_texname;              // map_d
   std::map<std::string, std::string> unknown_parameter;
 } material_t;