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draw circle

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Given the minimal info you've supplied, the simplest answer is probably to use immediate mode and GL_LINE_LOOP, along with the C++ cos() and sin() functions. If you need more info than that, you'll probably have to be more specific with your question.

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Since it's not mentioned in either of the threads listed, gluDisk() will draw a circle.

GluDisk() Documentation

void gluDisk( GLUquadric* quad
, GLdouble inner
, GLdouble outer
, GLint slices
, GLint loops
);

Just make your inner value only slightly smaller than your outer value.

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