A bug in ObjImporter

[ghost]

Hi
First of all, you did a great work.

I found a tiny bug in the obj importer (ObjImporter), when trying to import an obj file that has no textures the code will raise IndexOutOfRangeException in line 77. The solution is very simple, just add an if condition to check if the number of textures in the mtl file.

Old code:

// Copy normals.
foreach (int textureIndex in f.TextureIndices)
{
        TextureCoordinate tc = wavefrontObject.Textures[textureIndex];
        mesh.TextureCoordinates.Add(new Point3D(tc.U, tc.V, tc.W));
}

New code (my code):

// Copy normals.
foreach (int textureIndex in f.TextureIndices) 
{
    if (wavefrontObject.Textures.Count > 0) 
    {
          TextureCoordinate tc = wavefrontObject.Textures[textureIndex];
           mesh.TextureCoordinates.Add(new Point3D(tc.U, tc.V, tc.W));
    }
}

Thanks a lot