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请问OPENGL怎么绘制环形?

请问各位大佬,OPENGL怎么绘制环形,并且能够在上面着色呢?
请多指点,不胜感激!


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环形,也就是内外两圆。圆形,可以作用多个正多边形代替,比如正二十边形或者正四十边形。


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