I had a question about the information stored in a .TGA bumpmap.
1. What does each of the components represent RGBA?
From a per channel preview of the image, what I gathered was that R is the x component of the normal, G is the y component of the normal and B and A I couldn't think of anything. Can someone correct me if I'm mistaken!!
2. Should the sqrt(R*R+G*G+B*B) of each pixel in the bump image be 1.0 necessarily so that all normals are of unit length?
3. Can someone point me to a website where I can find more info. on this topic?