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dorca

Drawing a plane

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Hi, I'm totally new to OpenGL and I would like to draw a triangle on a given plane by the plane equation (ax+by+cz+d=0) in 3D. How can I find at least 3 points on the given plane? Or... is there any other quicker way to restrict coordinate plane to the given plane and draw a rectangle?

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This is basically a billboarding problem. Try searching the forum archives for 'billboarding' and/or 'orthonormal basis', and you should find something you can work with (how to build a basis from a single vector has been covered many times here in the past).

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