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OpenGL How to draw a line indicating the normal?

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Hi I am currently working on a project using normals and curvatures and was wondering could someone point me in the direction of a good tutorial on drawing lines in openGL that indicate the normal?

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I am currently working on a project using normals and curvatures and was wondering could someone point me in the direction of a good tutorial on drawing lines in openGL that indicate the normal?
I doubt there are any tutorials on that subject - what part do you need help with exactly? Are you wanting to know how to draw line segments in OpenGL? Or how to compute the start and end points for the line segment representing the normals?

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