OBJ Specular map support

[zen253230]

There is unluckily no support for obj specular map.

map_Ns is not interpreted in the mtl parser while loading obj file.

The only alternative would be to define materials but when there are too many of them it implies unnecessary drawcalls in comparison with texture loading...

[kovacsv]

Could you please attach the file?

[zen253230]

Files are located at: https://github.com/gfxfundamentals/webgl-fundamentals/tree/master/webgl/resources/models/windmill

Clearly there is no specular lighting taken into account