Subject:
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Re: LDraw File Format Spec 1.0 DRAFT - Call for Public Comments
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Newsgroups:
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lugnet.cad
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Date:
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Tue, 21 Aug 2007 14:48:01 GMT
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Viewed:
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3628 times
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Rob Ross wrote:
> But, one thing I have learned so far is that the rule about non-concave quads is
> actually a limitation of OpenGL. It doesn't support them.
Actually I find it quite logically it's not supported. And I don't think
it's a specific OpenGL thing.
Once the vertices's are not concave, you basically stop having a Quad
all to getter. It becomes a polygon, and how is the hardware supposed to
know how to divide it in triangles (Far I know all hardware processes
only triangles).
Just look at a test openGL project, you will see it will draw 2
triangles but they will overlap because it guesses wrong.
You could correct it by rearranging the order of vertices's but I don't
know of all implementations 'divide' their quads the same way (e.g V 1 2
3 and V 2 3 4).
So like Rob Ross wrote, it would basically be a lot easier for us
rendering people to process line type 3 in those cases :)
Roland
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