Does any one know a REALY good, but somewhat followable tutorial on Projective Texture Mapping? I would like to be able to do it with standard OpenGL, and not have to use any card specific calls. I like the Shadow mapping capablitites. Anyone have a suggestion?
Projective texture is REALLY simple.
There are two things involved.
manipulations of the texture matrix
Texgen LINEAR for s, t, and r are required to set up a coordinate frame about the origin with axis aligned s, t & r, then you just make a glFrustum call on the texture matrix and that sets up the s & t divide by r.
I have some more information on this page: