Subject:
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Re: Ribbed hoses synth
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Newsgroups:
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lugnet.cad, lugnet.cad.dev
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Date:
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Sun, 19 Dec 2004 22:43:31 GMT
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Viewed:
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1036 times
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In lugnet.cad, Kevin L. Clague wrote:
> I made LSynth's source code open from the beginning, in case
> someone better at math than I might take a swing at it. It has
> never really made it past the proof of concept stage. Feel free to
> make additions....
>
> There are two changes I have planned for LPub short term (ha! a
> relative term):
>
> 1. Reduces file sizes for most hoses, cables and rubber band.
> (the idea is to scale the size of hose cross segment limited by
> angular resolution.)
Hey I know a spiffy little recursive algorithm that'd probably do
a nice job of that. I used to use it in 2D to reduce the size of
vectorized scanned image files, but it should extend nicely to 3D.
You start with the end points of a curve. Then you find the farthest
point on the curve from the straight line between the ends. Split
the line at that point if the distance is greater than your angular
tolerance. Recursively apply this to the two new segments.
The distance is just the cross product divided by the length of the
line segment between the end points (the area of a parallelegram
divided by the base).
If you want to get fancy, you can check for a negative dot product,
which tells you a split point is past one of the ends of the line
segment. Then you can use the radial distance instead of the
perpendicular distance.
> 2. Make *all* of the hose/cable synthesis attributes (hose end,
> and cross section pieces) configured by a text file that is read at
> run time.
Yes, that'd be nice.
Enjoy,
Don
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Message has 2 Replies:
 | | Re: Ribbed hoses synth
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| (...) Maybe it is indeed the best to add some features to Lsynth, for I and many with me don't have a clue what to do with the sourcecode and formulas, the only thing I might be useful to is in saying what would be a good userinterface... (20 years ago, 22-Dec-04, to lugnet.cad, lugnet.cad.dev)
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Message is in Reply To:
| | Re: Ribbed hoses synth
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| (...) Hi All, Happy holidays. I made LSynth's source code open from the beginning, in case someone better at math than I might take a swing at it. It has never really made it past the proof of concept stage. Feel free to make additions.... I just (...) (20 years ago, 19-Dec-04, to lugnet.cad, lugnet.cad.dev)
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