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Help! about Projective Texture Mapping

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Hi all: I'm currently working on my shadow system using Projected Texture technique. Here is the document on NVIDIA's website. http://developer.nvidia.com/object/Projective_Texture_Mapping.html The problem is when projecting the texture, the back side of the reciever(faces which do not face the caster) still recieve the shadow. here is picture ps: Wish that could make you understand what I'm talking about. ps: I paint the shadow with white and the background with back color for your convenience to see what is the problem.

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That's a natural trait of projected textures: Both the front side, and backside of an object recieve the projection.

The reason you don't always see it in shadow maps, is because those backfaces are dark due to a dot product lighting.

~Main

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