Tangent-Space to World-Space

I recently wrote a GLSL shader that tried to convert light posistion, spot direction, and eye posisition to tangent space. I tried to do this for all eight lights. It didnt’ work. It turns out you can’t pass that much data from a vertex shader to a fragment shader.

Instead, I was wondering if there was some way of translating the normal-map value from tangent space to world space?

This would let me pass only one varying vec4 instead of 13.

Thanks,
AdamNation

You can send transformation matrix from tangent space to world space into fragment shader and do the transformation of normal stored in a normal map there…

( this is often done when you are using cube-map environment mapping with bumpmapping becouse you to get the right value from cube map you need to provide correct world - space coordinates )

Great does anybody know how to invert a matrix inside a fragment shader?