private static void LoadMTLLib(string path, ref ObjModel returnValue)
{
StreamReader stream = new StreamReader(path);
while (!stream.EndOfStream)
{
ParseLine(stream.ReadLine(), ref returnValue);
}
}
internal static ObjModel Load(string path)
{
if (path.Contains(@"\"))
{
Directory.SetCurrentDirectory(path.Substring(0, path.LastIndexOf(@"\")));
path = path.Substring(path.LastIndexOf(@"\") + 1);
}
ObjModel returnValue = new ObjModel();
StreamReader stream = new StreamReader(path);
while (!stream.EndOfStream)
{
ParseLine(stream.ReadLine(), ref returnValue);
}
return returnValue;
}
private static void ParseLine(string line, ref ObjModel returnValue)
{
if (line.Length == 0 || line[0] == '#')
{
return;
}
string[] parts = line.Split(new string[] { " ", "\t" }, StringSplitOptions.RemoveEmptyEntries);
switch (parts[0])
{
case "mtllib":
{
LoadMTLLib(parts[1], ref returnValue);
break;
}
case "newmtl":
{
returnValue.Materials.Add(parts[1], new Material(parts[1]));
break;
}
case "Ka":
{
returnValue.Materials.Last().Value.AmbientColor = new Color(double.Parse(parts[1]), double.Parse(parts[2]), double.Parse(parts[3]));
break;
}
case "Kd":
{
returnValue.Materials.Last().Value.DiffuseColor = new Color(double.Parse(parts[1]), double.Parse(parts[2]), double.Parse(parts[3]));
break;
}
case "Ks":
{
returnValue.Materials.Last().Value.SpecularColor = new Color(double.Parse(parts[1]), double.Parse(parts[2]), double.Parse(parts[3]));
break;
}
case "Ns":
{
returnValue.Materials.Last().Value.SpecularCoefficient = float.Parse(parts[1]);
break;
}
case "d":
{
returnValue.Materials.Last().Value.Transparency = float.Parse(parts[1]);
break;
}
case "Tr":
{
returnValue.Materials.Last().Value.Transparency = float.Parse(parts[1]);
break;
}
case "illum":
{
returnValue.Materials.Last().Value.IlluminationModel = int.Parse(parts[1]);
break;
}
case "map_Ka":
{
returnValue.Materials.Last().Value.AmbientTextureMap = parts.Last();
break;
}
case "map_Kd":
{
returnValue.Materials.Last().Value.DiffuseTextureMap = parts.Last();
break;
}
case "map_Ks":
{
returnValue.Materials.Last().Value.SpecularTextureMap = parts.Last();
break;
}
case "map_Ns":
{
returnValue.Materials.Last().Value.SpecularHighlightTextureMap = parts.Last();
break;
}
case "map_d":
{
returnValue.Materials.Last().Value.AlphaTextureMap = parts.Last();
break;
}
case "map_bump":
{
returnValue.Materials.Last().Value.BumpMap = parts.Last();
break;
}
case "bump":
{
returnValue.Materials.Last().Value.BumpMap = parts.Last();
break;
}
case "disp":
{
returnValue.Materials.Last().Value.DisplacementMap = parts.Last();
break;
}
case "decal":
{
returnValue.Materials.Last().Value.StencilDecalMap = parts.Last();
break;
}
case "v":
{
returnValue.Vertices.Add(new MeshPosition(float.Parse(parts[1]), float.Parse(parts[2]), float.Parse(parts[3])));
break;
}
case "vn":
{
returnValue.Normals.Add(new MeshNormal(float.Parse(parts[1]), float.Parse(parts[2]), float.Parse(parts[3])));
break;
}
case "vt":
{
returnValue.Textures.Add(new MeshTexCoord(float.Parse(parts[1]), -float.Parse(parts[2])));
break;
}
case "g":
{
Material lastMaterial = null;
if (returnValue.Groups.Count > 0)
{
lastMaterial = returnValue.Groups.Last().Material;
}
returnValue.Groups.Add(new Group(parts[1]));
returnValue.Groups.Last().Material = lastMaterial;
break;
}
case "usemtl":
{
if (returnValue.Groups.Last().Material != null)
{
returnValue.Groups.Add(new Group(parts[1]));
}
returnValue.Groups.Last().Material = returnValue.Materials[parts[1]];
break;
}
case "f":
{
Face f = new Face();
for (int i = 1; i < parts.Length; i++)
{
f.Vertices.Add(new FaceVertex(int.Parse(parts[i].Split('/')[0]), int.Parse(parts[i].Split('/')[1]), int.Parse(parts[i].Split('/')[2])));
}
returnValue.Groups.Last().Faces.Add(f);
break;
}
}
}
