[HOpenGL] Confused about normals

[Sven Panne]

Patrick Scheibe wrote:
> [...] But now I am a little bit confused. I'm sure to heard about that if
> you specify the vertexes of a polygon (with glBegin GL_POLYGON in c)
> counterclockwise then the normalvector is set automatically. [...]

I think you refer to the fact that OpenGL has a notion of "front" and "back"
for polygons. You can control which order (clockwise or counter-clockwise)
should be considerered "front" via frontFace.

Another tip regarding normals and lighting: Most of the time it's a good
idea to have normals of unit length. If your application can't assure this,
normalize and rescaleNormal can help.

Cheers,
    S.