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Thread: Frustum planes

  1. #1
    Junior Member Newbie
    Join Date
    Jul 2001
    Moscow, Russia

    Frustum planes

    Can anybody ask to me how can I get frustum planes from projection matrix
    like at
    For me interesting mathematical side of this question.

  2. #2
    Senior Member Regular Contributor
    Join Date
    Apr 2011

    Re: Frustum planes

    You can use gluUnProject to get those eight corners of the frustum. From the corners' coordinates, you can get the equation of each planes.
    About the mathematics behind, it's the inverse of the product of Projection matrix and ModelView matrix.

    [This message has been edited by Coconut (edited 07-31-2001).]

  3. #3
    Senior Member OpenGL Guru zed's Avatar
    Join Date
    Nov 2010

    Re: Frustum planes

    theres also an example in the faq
    with a bit of an explanation

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