Subject:
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Re: LDraw coordinate system driving me crazy
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Newsgroups:
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lugnet.cad.dev
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Date:
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Sun, 19 Nov 2006 15:00:39 GMT
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Viewed:
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3040 times
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In lugnet.cad.dev, Roland Melkert wrote:
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Hello all,
I’m having difficulties with the ldraw coordinate system. As fas I
understood it it’s Right handed, just like OpenGL. So
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I’ve been having difficulty with importing/exporting .dat files from SketchUp.
In SketchUp, if you stand at the Origin;
X is right, Y is forward, and Z is up.
The LDraw Primitives Reference (http://www.ldraw.org/library/primref/) says
the LDraw axes are:
X is right, Y is down, and Z is forward. Here’s the image from the reference
page.
So it first seems like a simple 90 degree rotation around the X axis is all you
need to convert between SketchUp and LDraw system, but it doesn’t work in
practice. I can’t get the 2 systems to agree on an axes system.
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Message has 2 Replies:
 | | Re: LDraw coordinate system driving me crazy
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| A sincere thanks to all of you. Your comments made me go back over (again) my export code, and I found an error. Now it works as expected. I was getting funny rotations because I mis-ordered the elements of the transformation matrix, duh. Seems (...) (18 years ago, 20-Nov-06, to lugnet.cad.dev, FTX)
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Message is in Reply To:
| | LDraw coordinate system driving me crazy
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| Hello all, I'm having difficulties with the ldraw coordinate system. As fas I understood it it's Right handed, just like OpenGL. So X positive is right X negative is left Y Positive is top Y Negative is bottom z Positive is front z negative is back (...) (18 years ago, 19-Nov-06, to lugnet.cad.dev)
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