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Thread: Is it necessary to do the needless work?

  1. #1
    Junior Member Newbie Fraktalius's Avatar
    Join Date
    Jul 2008
    Russia, Moscow

    Is it necessary to do the needless work?

    When we rotating, translating or scaling a scene, we must draw the scene again and again and it extremely slowing down the computer work, if the scene contains difficult images. Is there in OpenGL a way to avoid a reiteration?

  2. #2
    Senior Member OpenGL Guru
    Join Date
    Mar 2001

    Re: Is it necessary to do the needless work?

    This is how rendering applications work. You draw the whole scene every frame.

  3. #3
    Member Newbie
    Join Date
    May 2001

    Re: Is it necessary to do the needless work?

    Best you can do is draw simplified geometry during the rotation/panning, and then the complete mesh again when the motion has finished.

  4. #4
    Super Moderator OpenGL Lord
    Join Date
    Dec 2003
    Grenoble - France

    Re: Is it necessary to do the needless work?

    Be sure to submit the geometry efficiently to the GPU. No need to transfer all this data each frame. Use at least old fashionned display lists, or even better : VBO (vertex buffer objects).

    For zoom/pan, you may get away with capturing to texture the first render, then only manipulate a quad texture with it. Very fast.

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