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Bump maps


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Well, I'm managed to generate textures and meshes using procedural techniques.  Now I'm working on bump maps.  For my first attempt, my assumption was the bitmap contained the actual normals, no worky.  I guess this means the values in the bitmap are actually offsets from the interpolated normal in the vertex shader?  What does the math look like?  Is it this?


normalize(vertex_shader_normal + bump_map_normal)


I'm pretty sure I understand the encoding of the bitmap (ie -1.0 to 1.0 -> 0 to 255) for (xyz -> rgb)



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