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Thread: Number of vertices

  1. #1
    Junior Member Newbie
    Join Date
    Nov 2007
    Location
    Poland
    Posts
    17

    Number of vertices

    Hi, is there any way to count the number of displayed vertices ???
    I mean of course automatic way - cause it's possible to count it manually for every object. Any ideas ?

  2. #2
    Senior Member OpenGL Guru
    Join Date
    Dec 2000
    Location
    Reutlingen, Germany
    Posts
    2,042

    Re: Number of vertices

    You could render all vertices as GL_POINTS without depth-test and do an occlusion query. Since every point should be rendered as exactly one pixel, the result of the query should give you the number of rendered points.

    However on ATI cards i encountered that occlusion queries are not reliable in the exact number of fragments counted, so this will not work on all hardware equally precise.

    Other than that, i don't think there is an "automatic" way.

    Jan.
    GLIM - Immediate Mode Emulation for GL3

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