Per Pixel Dot Product anyone?

Missing Name · 2003-09-22T19:15:51

I''m working on this lighting algorithm that kindof simulates real ambient and diffuse lighting. I''ve got the ambient part working great, taking slices of a 3d volumetric lightmap. However, the diffuse part seems a bit more complicated, and I''m rather stumped at the moment. Does anyone know about some info on calculating a per pixel dot product? I was thinking maybe this could be done with ARB fragment program or something, but I''m not quite sure how I could write the program at the moment. I''m thinking of a way it could work, but I''d need to be able to send the normal and light direction to the program, and I''m not quite sure how yet, especially sence I''m already using 2 texture slots with multitexture in 1 pass. Any help, comments would be great at the moment. (I''m using a Radeon 9700 pro) Thank you