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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 21:29:43 GMT
Viewed: 
4460 times
  
In lugnet.cad, Steve Bliss wrote:
In lugnet.cad, Rob Ross wrote:

I think it would be helpful to mention the used matrix in line type 1 is
row orientated (more clearly then 'standard matrix').

Just my thoughts,

Roland

Is this really what the LDRAW spec is stating? Because that would be contrary to
the OpenGL spec, in which the standard ordering of matrices is column-major.

Umm, so what?  LDraw is not, and should not, be dependent on OpenGL.

Having worked with transformation matrix in both formats, I find the row-major
format much easier to hand-edit than column-major organization.  At least for
LDraw-type usage (ie, editing part files and model files).

Steve

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



Message has 1 Reply:
  Re: LDraw File Format Spec 1.0 DRAFT - Call for Public Comments
 
(...) 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 (...) (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
 
(...) Umm, so what? LDraw is not, and should not, be dependent on OpenGL. Having worked with transformation matrix in both formats, I find the row-major format much easier to hand-edit than column-major organization. At least for LDraw-type usage (...) (17 years ago, 21-Aug-07, to lugnet.cad)

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