Hello,
I've been trying to solve the back-projection issue when doing projective texturing, with the goal of having it work with shadow maps. I know the simplest thing is to use a shader, and that part is already working, it's the 'support older hardware' requirement that's biting me. I modified the 'osgshadowtexure' example by adding a 1D texture that maps to the r coordinate used by the projective TexGen and trying to use this to control the application of the shadow texture. The idea is to give the projected texture an alpha of 0 (invisible) when it has negative r coordinate, using TexEnvCombine. I almost got the result I was looking for, but it not only wipes out the shadow texture, but the base texture as well. The frustrating thing is that it seems that 'setCombine_Alpha' is being ignored, and I can't see an RGB operation that will give the proper result. The example is meant to be dropped into the examples dir in the sources, then added to the CMakeLists.txt file. There was another thread dealing with a similar issue 'TexGenNode & TexEnvCombine' but while David mentioned using a masking texture, there were no details. Cheers Mihai Radu
osgshadow-backproj.7z
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