projective texture mapping and shadow mapping

[phoenix_gl]

I am trying to implement projective texture mapping in opengl. Suppose there is a projector ,which project a image onto the model. Hopfully,I need only front side can be painted by image and back side should be occluded. How to do that?


Could anyone help me about that?

[Dark Photon]

Look at the diagram on this page under Projective Texturing:

* Shadow Mapping (Paul's Projects)

Read the text for more details on how it works.

Of course nowadays you wouldn't use the fixed-function texture coordinate generation (GL_TEXTURE_GEN* stuff) ... you'd just pass the matrix into a shader uniform and use it directly in your shader math to generate the texture coordinates. Simpler.