Robert Covington wrote:

Also, with gluDisk, seems you have to make 2 lists, and flip one 180, otherwise the back of a gluDisk does not show up? (might be setting issue)
IIRC, both sides should show if you turn off face culling.
   glDisable( GL_CULL_FACE );
Can I do that for the ring, but not the sphere that's the planet?

glEnable( GL_CULL_FACE );

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