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 15:16:12 GMT
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Viewed:
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3078 times
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In lugnet.cad.dev, Jim Foltz wrote:
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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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In LDraw +z is backwards, not forwards or more strictly +Z points away from the
camera when X is right and -Y is up.
Tim
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Message has 1 Reply:
 | | Re: LDraw coordinate system driving me crazy
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| Hi, Here's my box test model in SketchUp. (The above model is the same model unfolded.) (URL) When I export this model to a .dat and open it in LDView, the green side is the top-view, blue is the front view (as expected), and I would expect the (...) (18 years ago, 19-Nov-06, to lugnet.cad.dev, FTX)
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Message is in Reply To:
| | Re: LDraw coordinate system driving me crazy
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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 ((URL)) says the LDraw axes are: X is right, Y is (...) (18 years ago, 19-Nov-06, to lugnet.cad.dev, FTX)
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