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Thread: How to draw a quardratic surface?

  1. #1
    Newbie Newbie
    Join Date
    Apr 2014

    Question How to draw a quardratic surface?

    For example, I have a surface defined like: z = ax^2 + bxy + cy^2.
    How can I draw it using openGL?
    Thanks a lot.

  2. #2
    Member Regular Contributor Agent D's Avatar
    Join Date
    Sep 2011
    Innsbruck, Austria
    Lagacy or core only? AFAIK legacy OpenGL(R) has functions for drawing quadrics. (I have never used them myself)

    Personally, I would stick to core profile OpenGL(R), create a vertex buffer by subdividing a square (e.g. 10*10 sub patches -> 200 triangles -> 100 vertices + 600 indices. Can be easily generated in a for loop). For each vertex, map the 2D coordinates on the square surface to the range you are interested in and compute the resulting third coordinate.

    The resulting vbo/ibo combination can be rendered like any other object.

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