i just seen a program on TV about experiments that changed the world (hang on, keep reading!) and one was how prisms refract light into it's seperate colors, dig out you pink floyd cd. I tried to simulate this in vue but i'm struggling, anyone done it already? does vue have the ability to do this, i think it does as you get refractive index's of glass and stuff. have a look at the pic, you need a pierce of light going into the prism then hitting a wall to see the colors. just thought it's pretty cool, i'll keep going!