Subject:
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Re: Part Authors: opinions sought on T-Junctions
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Newsgroups:
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lugnet.cad.dat.parts
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Date:
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Tue, 6 Mar 2007 14:31:17 GMT
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Viewed:
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5476 times
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In lugnet.cad.dat.parts, Travis Cobbs wrote:
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In lugnet.cad.dat.parts, Mark Kennedy wrote:
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In lugnet.cad.dat.parts, Travis Cobbs wrote:
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So, what do you as part authors think? Should T-junctions be avoided
in order to avoid the rendering errors that they can introduce, or
should part authors continue to strive to make parts with the fewest
number of polygons possible?
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I try to minimise file size whenever possible myself and have nothing
against T juctions. While the gaps can be annoying I feel that they are a
fault of the rendering program rather than the parts.
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I’d really appreciate it if you didn’t blame it on the rendering programs.
There’s really nothing that they can do to fix the problem. I can
understand why you might feel that they are at fault, but it really
isn’t true.
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Well... Technically it is true. The rendering program ought to be
able to scan all the points in each part and look for intersections
with every edge in the part. Then break up the offensive T-joins
automagically and render it perfectly. That’s only O(n^2) or so.
Blink of an eye on today’s processors.
Doesn’t ldview do this already? I’m sure txt2dat does. Try to be
a little more up to date, will ya? ;^)
Have fun,
Don
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Message has 2 Replies:
 | | Re: Part Authors: opinions sought on T-Junctions
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| (...) OK, I stand corrected. Technically a program can fix things a load time. However, you might be surprised at how long it takes. It's "only" O(n^2), but each iteration is slow. You have to search the current line segment against all other line (...) (18 years ago, 6-Mar-07, to lugnet.cad.dat.parts, FTX)
| | | Re: Part Authors: opinions sought on T-Junctions
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| (...) Well actually what txt2dat does is a slightly different problem - it has a few simple closed loops and has to triangulate the complex polygons bounded by them (it uses the excellent (URL) triangle library> to do that). Renderers on the other (...) (18 years ago, 6-Mar-07, to lugnet.cad.dat.parts, FTX)
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Message is in Reply To:
| | Re: Part Authors: opinions sought on T-Junctions
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| (...) I'd really appreciate it if you didn't blame it on the rendering programs. There's really nothing that they can do to fix the problem. I can understand why you might feel that they are at fault, but it really isn't true. As such, you might (...) (18 years ago, 6-Mar-07, to lugnet.cad.dat.parts, FTX)
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