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 23:45:13 GMT
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Viewed:
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4454 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:
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Err, reverse course. I peeked at the autotrace source and it says
in pxl-outline.c “Outside outlines are traced counterclockwise”. So
if you want to make things easier for me, do it that way. ;^)
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OK. My edges already were counterclockwise. :) Umm, for inside outlines
(inlines?) to be clockwise, that’s ‘clockwise’ from a global view, right? If
so, then my inlines are already clockwise. But I don’t know which ones are
inlines, and which one are outlines. :O
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You lost me there. How could you not know which is which if they already
go in the opposite direction? Just take a cross product at the topmost
point. If it’s negative, then it’s clockwise and thus a hole.
Don
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Message has 1 Reply:
 | | Re: non-lego rendering using various LDraw tools
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| (...) I mostly meant that I knew what their windings had to be (because of the way the edges are constructed), but the code isn't aware of it. However, like you say, it's easy enough to find an extreme point and test the winding. Steve (20 years ago, 24-Sep-04, to lugnet.cad.dat.ideas, FTX)
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Message is in Reply To:
| | Re: non-lego rendering using various LDraw tools
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| (...) OK. My edges already were counterclockwise. :) Umm, for inside outlines (inlines?) to be clockwise, that's 'clockwise' from a global view, right? If so, then my inlines are already clockwise. But I don't know which ones are inlines, and which (...) (20 years ago, 23-Sep-04, to lugnet.cad.dat.ideas, FTX)
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