Subject:
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Re: LDGLite bug report (and POV preview question)
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Newsgroups:
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lugnet.cad.dev
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Date:
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Tue, 4 Sep 2001 23:11:05 GMT
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Viewed:
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2244 times
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Don Heyse wrote...
> I'm not sure if I mentioned this yet, but the pesky ldglite bugs
> with MESA perspective mode have been fixed and a new version is up
> on the sourceforge. I still have to incorporate the new ldlite 2.3
> bugfix for large MPD files, but it works for now with the L3 parser.
;-)
> By the way, with all this talk about datsville and camera angles and
> whatnot, I've been wondering if ldglite could be useful as a POV
> previewer. With a little bit of work, I might be able to make the
> perspective projection mode show the same view as you would get by
> running the DAT file through L3P, except without the nice ray tracing.
> Perhaps this could be used to quickly determine if you like the camera
> angle. Of course, for all I know, ldglite may actually be *slower*
> than L3P and POV...
If you want to make a previewer for finding a good camera setting
you should adjust the camera location and look_at positions.
When done, specify these two coordinates to L3P using -cc and -cla.
As mentioned at the introduction of L3Lab (Feb 2000), my plan is to
enable you to rotate/pan/zoom the scene until you have a good view,
and then generate the POV code. I believe LeoCAD is capable of this.
I still need to figure out the best user-interface for rotate/pan/zoom
and I need to find the time...
> Anyways, I suspect I have just about everything I need built in with
> the L3 parser. The only iffy part is the auto-centering part of L3P.
> I'm not sure exactly what coordinates that uses: the bounding box, or
> something else?
The automatic camera positioning algorithm is rather complex and involves
solving six equations with six unknowns.
The basic idea is described in
http://home16.inet.tele.dk/hassing/l3p.html#l3globe
> Here's a sample shot of datsville with a bit of with fogging enabled,
> and studs and edgelines disabled.
>
> http://www.brickshelf.com/cgi-bin/gallery.cgi?i=67488
Very nice
/Lars
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Message has 1 Reply:
 | | Re: LDGLite bug report (and POV preview question)
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| (...) I'm not sure if I *want* to do this, I was just asking if it would be useful. I asked because I already added -cc and -ca (not sure what -cla is) to ldglite so I could move the camera enough to test my recent bug fixes. Since I tend to add (...) (25 years ago, 6-Sep-01, to lugnet.cad.dev)
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Message is in Reply To:
| | Re: LDGLite bug report (and POV preview question)
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| I'm not sure if I mentioned this yet, but the pesky ldglite bugs with MESA perspective mode have been fixed and a new version is up on the sourceforge. I still have to incorporate the new ldlite 2.3 bugfix for large MPD files, but it works for now (...) (25 years ago, 4-Sep-01, to lugnet.cad.dev)
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