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Thread: dotted lines in the quads

  1. #1

    dotted lines in the quads

    The thing is I drawed some quads and texture them, I enabled the blending and anti-aliase, but there were
    always some dotted lines( with the background color) acrossing the non-adjacent two points in the quad, there is only
    one dotted line each quads, when I turned off the anti-aliase, it went away.

    Any ideas ?


  2. #2
    Member Contributor
    Join Date
    May 2000
    Ottawa, Ontario, Canada

    Re: dotted lines in the quads

    Check backface culling and your windings.

  3. #3
    Senior Member Frequent Contributor
    Join Date
    Feb 2000

    Re: dotted lines in the quads

    I've seen this as well; it's a side-effect of enabling GL_POLYGON_SMOOTH. The quad is being drawn as two triangles, and all the edges of the triangles (including the shared edge through the middle of your quad) get blended with the background colour.

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