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So I’d like to be able to draw a circle where I can specify the amount of circle drawn as shown in the following diagram.
AS an opengl newbie I’m not really sure how to approach this.. I’ve previously drawn full circles using GL_TRIANGLE_FAN
You already know how to draw a circle using a triangle fan. Now you just have to calculate the angles of the cutoff corners, use those as the beginning and end of the arc and place the hub of the triangle fan at the middle of the cutoff edge.