Hi, sorry, the bot-monster hit me again! OK, cut/copy/paste... ******* Hi, you might render a plain rainbow with only black or white background (yet nothing else) to a picture and then use this (with some reworking) for a texture and the transparency-channel on a 2D-plate, which you could position everywhere in the scene? Like that faked lensflare trick! Well, never tried that myself, but it might work. Cheers, Hubert

"All that we see or fear, is but a Sphere inside a Sphere."     (E. A. Pryce -- Tuesday afternoon, 1845)