Method loadMTL

tutorials/common/scenegraph/obj_loader.cpp:347–489

load material file */

  /* load material file */
  void OBJLoader::loadMTL(const FileName &fileName)
  {
    std::ifstream cin;
    cin.open(fileName.c_str());
    if (!cin.is_open()) {
      std::cerr << "cannot open " << fileName.str() << std::endl;
      return;
    }

    std::string name;
    ExtObjMaterial cur;

    while (cin.peek() != -1)
    {
      /* load next multiline */
      std::string line; std::getline(cin,line);
      while (!line.empty() && line[line.size()-1] == '\\') {
	line[line.size()-1] = ' ';
	std::string next_line; std::getline(cin,next_line);
	if (next_line.empty()) break;
	line += next_line;
      }
      const char* token = trimEnd(line.c_str() + strspn(line.c_str(), " \t"));

      if (token[0] == 0  ) continue; // ignore empty lines
      if (token[0] == '#') continue; // ignore comments

      if (!strncmp(token, "newmtl", 6)) 
      {
        if (name != "") {
          material[name] = cur.select();
          material[name]->name = name;
        }
        
        parseSep(token+=6);
        name = token;
        cur = ExtObjMaterial();
        continue;
      }
      if (name == "") THROW_RUNTIME_ERROR("invalid material file: newmtl expected first");
      
      try 
      {
        if (!strncmp(token, "illum", 5)) { parseSep(token += 5);  continue; }
        
        if (!strncmp(token, "d",  1)) { parseSep(token += 1);  cur.d  = getFloat(token); continue; }
        if (!strncmp(token, "Ns", 2)) { parseSep(token += 2);  cur.Ns = getFloat(token); continue; }
        if (!strncmp(token, "Ni", 2)) { parseSep(token += 2);  cur.Ni = getFloat(token); continue; }
        
        if (!strncmp(token, "map_d", 5) || !strncmp(token, "d_map", 5)) {
          parseSep(token += 5);
          cur.map_d = loadTexture(FileName(token));
          continue;
        }
        if (!strncmp(token, "map_Ka", 6) || !strncmp(token, "Ka_map", 6)) {
          parseSep(token += 6);
          cur.map_Ka = loadTexture(FileName(token));
          continue;