Computer Aided Design : 14713


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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 21:37:18 GMT
Viewed:	4635 times

In lugnet.cad, Rob Ross wrote: > The "so-what" would be that I, as someone who will eventually read in these > files to create OpenGL renderings of them, would expect the matrices to be in > column-major order, unless explicitly stated otherwise. I think the original suggestion that we mention that it is in row-major format is valid. I agree that the fact that OpenGL (almost certainly one of the top two most used 3D APIs on the planet) uses column major format is a good reason to specify that LDraw uses row-major format, instead of just saying "standard". It just proves that "standard" in this context is ambiguous. --Travis

Message has 2 Replies:

		Re: LDraw File Format Spec 1.0 DRAFT - Call for Public Comments
(...) You guys are both wrong, OpenGL is NOT column major. This is one of the biggest mistakes I keep hearing people repeat about OpenGL. The API doesn't care if you use column major or row major matrices, it just expects an array of 16 floats with (...) (17 years ago, 21-Aug-07, to lugnet.cad)

		Re: LDraw File Format Spec 1.0 DRAFT - Call for Public Comments
(...) I came across the current LDraw file spec here: (URL) the matrix example is using column-major ordering. So now I'm really confused. Does the current spec use column-major, and the new spec is proposing to change it? Or is the current spec (...) (17 years ago, 22-Aug-07, to lugnet.cad)

Message is in Reply To:

		Re: LDraw File Format Spec 1.0 DRAFT - Call for Public Comments
(...) The "so-what" would be that I, as someone who will eventually read in these files to create OpenGL renderings of them, would expect the matrices to be in column-major order, unless explicitly stated otherwise. Rob (17 years ago, 21-Aug-07, to lugnet.cad)

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