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glEdge question

Started by ECKILLER Feb 29, 2000 at 9:04 PM 0 replies 600+ views

Original Post

Feb 29, 2000 at 9:04 PM

hi, Ok i''m using indexes to draw my object. Its already drawn in wires but i can see the inner triangles. I know opengl provide glEdge to get rid of those unnecessary triangles. But how do i do it with indexes?? ECKILLER

Myopic Rhino

Mar 1, 2000 at 5:55 PM

I don''t thing glEdge is what you want. To get the effect you are looking for, you need to do hidden line removal. There is no built in function to do this, but there are quite a few straightforward algorithms available. Probably the easiest is to render the model in polygon line mode, enable a small polygon offset, and then render it again in polygon fill mode using the background color. The visual effect from this is not bad, but not great. If you want something better, you can look into algorithms using the depth and stencil buffers, which I don''t really have time to get in to here.

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