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Thread: Multiple ViewPorts

  1. #1
    Junior Member Newbie
    Join Date
    Dec 2002
    Posts
    14

    Multiple ViewPorts

    I had make a window that is splitted to 4 parts .one for the perspective view and other for top , left , bottom views .but i have a problem when window redrawen all windows are erased except the last one (Perpective) .How to solve that problem ?
    thnks

  2. #2
    Senior Member OpenGL Guru
    Join Date
    Feb 2000
    Location
    Sweden
    Posts
    2,978

    Re: Multiple ViewPorts

    I assume you do something like this for each viewport.

    1: Call glViewport to set viewport.
    2: Clear the viewport with glClear
    3: Setup matrices and draw.

    Common problem here is step 2. glClear will clear the entire window, erasing all previous viewports. What you need to do is either clear only once, which will clear all viewports at the same time, or restrict the clear area. Restricting the clear area is done with glScissor.

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