Subject:
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LDGLite bug report: Setting of z clipping plane without any effect
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Newsgroups:
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lugnet.cad.dev
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Date:
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Sun, 14 Oct 2001 19:16:18 GMT
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Viewed:
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420 times
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I have played around with running LDGLite as a pure command line
tool by redirecting its output to a virtual X server (Xvfb).
This works fine once you figure out how to generate the
appropriate orientation matrices to compensate for unusual
aspect ratios, but with one combination of a MPD file and an
orientation matrix I run into problems with the near z clipping
plane.
Download
http://jacob.sparre.dk/LEGO/By/Huse/Bunden_og_Kanden/butik.mpd
and try to run LDGLite with these parameters:
ldglite -l3 -a-1.212,0,-0.702,-0.451,1.609,0.778,0.538,1.349,-0.928 -o0,-100
-s2.0 -w2.0 -mc butik.mpd
It is not the wierd look that is the problem (thats to compensate
for Xvfb's wierd aspect ratio), but the clipping of the door
upstairs. If you then try to move the near and far z clipping
planes:
ldglite -z-4000 -Z4000 -l3
-a-1.212,0,-0.702,-0.451,1.609,0.778,0.538,1.349,-0.928 -o0,-100 -s2.0 -w2.0
-mc butik.mpd
LDGLite reports that it has changed the location of the z
clipping planes - "ZClip = (-4000, 4000)" - but the result
remains the same.
May I guess that the near z clipping plane can not be closer than
0?
Would it be practical to extend the "-o" argument with an
optional z offset to compensate for that?
Play well,
Jacob
--
http://www.ldraw.org/download/start/linux/
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Message has 1 Reply:
 | | Re: LDGLite bug reports
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| (...) Wow! Lots of bugs reports all at once. Where do I start? I don't know what's up with xvfb the aspect ratio problem. It seems odd since you can reshape an ldglite window and the aspect ratio is handled correctly. I guess I'll have to get xvfb (...) (23 years ago, 15-Oct-01, to lugnet.cad.dev)
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