The sunrays look really good. congrats. *thumbup* After looking a the code i may found the reason why it doesnt work on amd cards. You cant mix shadermodel 3.0 and 2. (or less) in the same pass, pixelshader 3.0 are only specified to be run with vertexshader 3.0. Nvidia drivers don't complain about this but amds does.
