Subject:
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Re: Blender to LDraw exporter (Blend2Dat v0.2)
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Newsgroups:
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lugnet.cad
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Date:
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Wed, 16 Jul 2008 07:43:21 GMT
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Viewed:
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5750 times
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Hello Stefan,
>
> I've uploaded my script. Right now, it exports everything as black, but it
> seems to work fine in Ldraw (you can change the color after the fact). If
> you run the resultant file through Edger, Ldview will smooth it properly.
> Also, it only exports the main object you have selected in Blender.
I just tested your script (on VERY simple objects, I'm a complete noob with
Blender!), it worked very well. A few things I noticed:
- Export color here is not black but color 16. This is the "main color" that
should be used for triangle and quads in LDraw parts, so this is the best choice
you can do!
- Your script can export very distorted quads (non-flat), this is something you
should take care of (split them into triangles). Or maybe there is an option in
Blender for that? See http://www.ldraw.org/Article512.html#coplanar and
http://philohome.com/isecalc/planarcheck.htm
>
> The next two things to work on are firstly, I'd like to incorporate the Edger
> code directly into the script. Quite honestly though, I just flat don't know
> how Edger does what it does, since I'm new to programming, so it's above my
> head at the moment. I'd very much appreciate help in this department.
I have not looked closely into Edger code, but a basic version could be done
like this: for each facet, search all other facets for a common edge. This edge
defines the first two points of the conditional line. Now take one point in each
facet not located on common edge. These are the two control points of the
conditional line.
You may have a look to OLC as another implementation of a condline generator:
http://philohome.com/isecalc/olc.htm
The first improvement to this basic scheme is to suppress condline generation
when the two facets are coplanar. Another one is to create a regular (type 2)
line in place of a condline when angle between facets is sharper than some (user
definable) threshold.
You may also find inspiration in stl2dat tool:
http://marc.klein.free.fr/lego/stl2dat/stl2dat.html
Philo
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Message has 1 Reply:
 | | Re: Blender to LDraw exporter (Blend2Dat v0.2)
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| (...) Haha I knew there was a reason I did that. :) (...) giant file, and can introduce undesirable smoothing artifacts. Generally, it is considered "good form" to ensure there are no coplanar quads when you are modeling something. Perhaps a (...) (16 years ago, 16-Jul-08, to lugnet.cad)
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Message is in Reply To:
| | Re: Blender to LDraw exporter (Blend2Dat v0.2)
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| Hi again, I've uploaded my script. Right now, it exports everything as black, but it seems to work fine in Ldraw (you can change the color after the fact). If you run the resultant file through Edger, Ldview will smooth it properly. Also, it only (...) (16 years ago, 15-Jul-08, to lugnet.cad, FTX)
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