If I want to make a version of my renderer run on a single texturing card but make best use of cards with up to 4 texture units, what''s the best way to do this? I know I can use effects to set up the renderstates and all but I''d still need different functions to actually do the rendering I think. Would having a function pointer set to the correct function be a sensible idea or really ugly? Thanks Read about my game, project #1 NEW (9th September)diaries for week #5 Also I''m selling a few programming books very useful to games coders. Titles on my site. John 3:16