erm...entity color? verticy color?...you can do all sorts of effects with those...
another is to create a small texture (2 pixel by 2 pixel) with sphereical mapping and appy it to the surfaces you want color changed...writepixelfast can run quite quick when you are only dealing with changeing four pixels.
another is to create a small texture (2 pixel by 2 pixel) with sphereical mapping and appy it to the surfaces you want color changed...writepixelfast can run quite quick when you are only dealing with changeing four pixels.