Subject:
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Re: LDraw File Format Spec 1.0 DRAFT - MATRIX section updated
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Newsgroups:
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lugnet.cad
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Date:
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Tue, 11 Sep 2007 19:36:26 GMT
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Viewed:
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4930 times
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In lugnet.cad, Don Heyse wrote:
> In lugnet.cad, Travis Cobbs wrote:
> > In lugnet.cad, Don Heyse wrote:
> > > Hey, could you perhaps toss in the word "homogeneous" when describing that
> > > matrix? I tend to find more complete explanations when I add that to my
> > > internet searches.
> >
> > Before I do that, can someone tell me if a 3D transformation matrix that
> > includes shear is still homogeneous?
>
> Yes, the matrix is still homogeneous. In fact this page contains a nifty
> explanation of how what we normally think of as a translation matrix is
> actually a shear matrix where the extra w dimension added to make things
> homogeneous is the fixed coordinate.
OK, I updated the first "4x4 3D transformation matrix" to now be "4x4
homogeneous transformation matrix". I didn't feel that leaving 3D in there
somewhere was practical. Because of this, I intentionally left the text alone
two sentences later, in the hopes that it would be helpful to people who aren't
up on the terminology. I think that the result is OK, but it might be
confusing.
Thoughts?
--Travis
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Message is in Reply To:
 | | Re: LDraw File Format Spec 1.0 DRAFT - MATRIX section updated
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| (...) Yes, the matrix is still homogeneous. In fact this page contains a nifty explanation of how what we normally think of as a translation matrix is actually a shear matrix where the extra w dimension added to make things homogeneous is the fixed (...) (17 years ago, 11-Sep-07, to lugnet.cad)
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