Computer Aided Design : 14703


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Subject:	Re: LDraw File Format Spec 1.0 DRAFT - Call for Public Comments
Newsgroups:	lugnet.cad
Date:	Tue, 21 Aug 2007 08:36:06 GMT
Viewed:	3381 times

In lugnet.cad, Orion Pobursky wrote: > > Line Types: Line Type 4 > I'm hesitant to disallow concave quads. There's nothing technically wrong > with them and a good chunk of the current official library doesn't conform. > --Orion Hi there. I'm just getting up to speed with OpenGL so it will be a little while before I can really sink my teeth into this. 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. So if the parts files have concave quads, the implementor using that model would have to do their own tesselation, i.e., breaking it up into non-concave pieces. I think it would be easier for the part designer to just do this up front, and save a lot of coding downstream by apps that have to read them in. Rob

Message has 1 Reply:

		Re: LDraw File Format Spec 1.0 DRAFT - Call for Public Comments
(...) 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 (...) (17 years ago, 21-Aug-07, to lugnet.cad)

Message is in Reply To:

		Re: LDraw File Format Spec 1.0 DRAFT - Call for Public Comments
(...) OK, I read the whole post and am reposting my comments here :-) Here are my comments. I'll delineate the section where appropriate. Purpose: "standard by which most create virtual LEGO® models" Due to past personal conflicts and missteps too (...) (17 years ago, 20-Aug-07, to lugnet.cad)

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