Alberto Luaces wrote:
If I reverse the normals the opposite side lights up as expected .. Am I doing something wrong..
Are you expecting both sides to be lit identically (i.e.: the front lit as brightly as the back) ? Keep in mind that OpenGL doesn't do global illumination (that is, light doesn't "bounce"), if a surface isn't facing a light source, it won't be lit.
If you only have one light source in the scene, and the front side is facing toward it, then the front side will be lit and the back won't. If you're trying to get both the front and back to be lit at a similar intensity, you may need to add one or more lights to the scene so that the back faces are also facing a light source.
--"J"
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