OpenGL Viewports

This is a discussion on OpenGL Viewports within the Game Programming forums, part of the General Programming Boards category; I'm writign a 3D pool game, and want to have a plan view of the table aswell as the main ...

  1. #1
    Registered User Anarchist's Avatar
    Join Date
    Jan 2002
    Posts
    12

    OpenGL Viewports

    I'm writign a 3D pool game, and want to have a plan view of the table aswell as the main 3D view

    is it possable to only draw the scene once and have 2 separate viewports with different camera settings or will I have to draw it for each viewport?

    in pseudocode

    Code:
    create viewport
    setup camera
    
    create second viewport
    set up second camera
    
    draw pool table
    or

    Code:
    create viewport
    setup camera
    draw pool table
    
    create second viewport
    set up second camera
    
    draw pool table
    the only difference is that I draw the table trice on the second one, and I dont think it will effect performance too much, but if it can be drawn once it would be more convenient and give a small increase in performance

    another question
    when opening a window to draw to how do you make sure that the editable area of the window is at for example 640x480 and the window border goes around that?

  2. #2
    Registered User
    Join Date
    Sep 2002
    Posts
    1,640
    Create two camera's, Capture the scene, Convert the captured
    2 scenes to textures, Scale the textures to 1\2 the screen on the
    y axis, Render the textures in the orthographic mode.

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