Is it possible to make masks like this using models and textures like in the ModelTexture Demo?

1. texpoly.beginUpdateTexCoords(0);
2. texpoly.updateTexCoord(0, 0, 0);
3. texpoly.updateTexCoord(1, 1, 0);    
4. texpoly.updateTexCoord(2, 1, 1);
5. texpoly.updateTexCoord(3, 0, 1);
6. texpoly.endUpdateTexCoords();