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N-Gons?

Started by Eight Jul 25, 2001 at 4:56 AM 2 replies 1k views

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Jul 25, 2001 at 4:56 AM

I was just looking at the documentation for the Wavefront (.obj) format. It seems this format creates faces/planes using a mininum of three vertices but doesn''t specify a maximum. In terms of writing an OpenGL renderer for these objects, is it possible to set OpenGL to render polygons with more than 3 or 4 vertices? I came across talk of using something like GL_POLYGONS which might wait until you specify a closed loop of vertices before it renders. Is this right? Can anyone point me to an example of it Kind regards, E

Dean Harding

Jul 25, 2001 at 5:52 AM

That''s right, though I won''t use it for anything that''s meant to be realtime. You''ll want to tesselate larger polygons, and maybe convert them to tristrips or fans.

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Julio

Jul 25, 2001 at 12:28 PM

GL_POLYGON is the slowest rendering of all of the rendering types. when you load the geometry you could split it up into triangles, (fans while you''re at it) which will speed it up if neccessary. If it runs fast enough with GL_POLYGONS then more power to you.

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Eight

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