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Thread: how to hide object?

  1. #1

    how to hide object?

    I have created two objects, A and B. I want B to be shielded behind A so that partial of B is visible. How can I do that?

  2. #2
    Junior Member Regular Contributor
    Join Date
    Oct 2002
    San Diego, CA, USA

    Re: how to hide object?

    If B is drawn behind A, and you want B to be occluded by A, then simply ensure depth buffering is turned on. The Z buffer should take care of the rest for you.

    If you require A to occlude B in a situation where B is NOT behind A, you can turn off depth buffering and draw B first, then A. This is called "the painter's algorithm" because what you painted last in any given pixel is what will appear on the screen.

  3. #3
    Super Moderator OpenGL Lord
    Join Date
    Dec 2003
    Grenoble - France

    Re: how to hide object?

    Draw A first, then B.

    Can you describe more precisely what you want ?
    If you need more, use stencil test tricks.

  4. #4

    Re: how to hide object?

    Actually I want my object A partially obscure B wnen viewed. Is there any useful and easy reference for me to refer to? I have read few OpenGL books, but I am not so understand how it is working, and there are quite number of HSR algorithms out there.

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