Initial support of reflection map(refl).

models/refl.mtl

@@ -0,0 +1,25 @@
+newmtl white
+Ka 0 0 0
+Kd 1 1 1
+Ks 0 0 0
+refl reflection.tga
+
+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/refl.obj

@@ -0,0 +1,32 @@
+# Test for `refl` material parameter
+mtllib refl.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

@@ -145,6 +145,7 @@ static void PrintInfo(const tinyobj::attrib_t &attrib, const std::vector<tinyobj
     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 itEnd(materials[i].unknown_parameter.end());
 
@@ -564,6 +565,26 @@ TEST_CASE("tr_and_d", "[Issue43]") {
   REQUIRE(0.75 == Approx(materials[1].dissolve));
 }
 
+TEST_CASE("refl", "[refl]") {
+  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/refl.obj", gMtlBasePath);
+
+  if (!err.empty()) {
+    std::cerr << err << std::endl;
+  }
+
+  PrintInfo(attrib, shapes, materials);
+
+  REQUIRE(true == ret);
+  REQUIRE(5 == materials.size());
+
+  REQUIRE(materials[0].reflection_texname.compare("reflection.tga") == 0);
+}
+
 #if 0
 int
 main(

tiny_obj_loader.h

@@ -156,6 +156,7 @@ typedef struct {
   std::string bump_texname;                // map_bump, bump
   std::string displacement_texname;        // disp
   std::string alpha_texname;               // map_d
+  std::string reflection_texname;          // refl
 
   texture_option_t ambient_texopt;
   texture_option_t diffuse_texopt;
@@ -164,6 +165,7 @@ typedef struct {
   texture_option_t bump_texopt;
   texture_option_t displacement_texopt;
   texture_option_t alpha_texopt;
+  texture_option_t reflection_texopt;
 
   // PBR extension
   // http://exocortex.com/blog/extending_wavefront_mtl_to_support_pbr
@@ -859,6 +861,7 @@ static void InitMaterial(material_t *material) {
   material->specular_highlight_texname = "";
   material->bump_texname = "";
   material->displacement_texname = "";
+  material->reflection_texname = "";
   material->alpha_texname = "";
   for (int i = 0; i < 3; i++) {
     material->ambient[i] = 0.f;
@@ -1265,6 +1268,15 @@ void LoadMtl(std::map<std::string, int> *material_map,
       continue;
     }
 
+    // reflection map
+    if ((0 == strncmp(token, "refl", 4)) && IS_SPACE(token[4])) {
+      token += 5;
+      ParseTextureNameAndOption(&(material.reflection_texname),
+                                &(material.reflection_texopt), token,
+                                /* is_bump */ false);
+      continue;
+    }
+
     // PBR: roughness texture
     if ((0 == strncmp(token, "map_Pr", 6)) && IS_SPACE(token[6])) {
       token += 7;