Subject:
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Re: non-lego rendering using various LDraw tools
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Newsgroups:
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lugnet.cad.dat.ideas
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Date:
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Thu, 23 Sep 2004 18:55:30 GMT
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Viewed:
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4456 times
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In lugnet.cad.dat.ideas, Steve Bliss wrote:
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In lugnet.cad.dat.ideas, Don Heyse wrote:
Yep, thanks for doing that. Then I turned around and installed
Cygwin, so now I probably have gcc available -- I think.
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I’d imagine so. I don’t actually use Cygwin. I use the
mingw version of gcc on Windows because
I don’t want to worry about the Cygwin unix compatibility DLL.
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Ha. Once you’ve got vertices and edges, writing the Triangle format is
pretty straightforward. The only tricky bit (and one I did not solve) is
telling Triangle the location of ‘holes’. If you have open spaces in your
image, you have to tell Triangle, or it will happily pave over them.
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It’s not too hard to detect holes while you’re vectorizing edges, just
look at the pixel color above the highest point on each closed polyline.
You can encode this by writing outside edges clockwise and inside edges
counter-clockwise. I don’t remember if autotrace can do this. I’ll
have to check.
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I’ll happily share what I’ve done, especially if I ever finish it. But
(working with Autotrace) you were probably were ahead of what I accomplished.
But I’d be interested in looking at your code. :)
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The autotrace source code for LDR output from May is
here. I put the executable
here, but I don’t remember how
to run it.
There’s a batch file I used to test it in the source zip
file, but that might
not have all the right options for a real world
example.
Don
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Message has 1 Reply:
Message is in Reply To:
 | | Re: non-lego rendering using various LDraw tools
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| (...) Yep, thanks for doing that. Then I turned around and installed Cygwin, so now I probably have gcc available -- I think. (...) Heh. Yeah, considering how raw my edge-construction code is, a few small math errors wouldn't be noticeable. And the (...) (20 years ago, 23-Sep-04, to lugnet.cad.dat.ideas, FTX)
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