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some physics (Read 4306 times)
traer
some physics
Oct 31st, 2005, 11:29pm  
here's a simple particle physics library i wrote. no collisions but stable runge-kutta integrator and fast implementation.

http://www.cs.princeton.edu/~traer/physics

comments and bugs appreciated...
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REAS
Re: some physics
Reply #1 - Nov 1st, 2005, 5:47am  
It's added to the Libraries page. Thank you for the contribution.

Casey
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mark hill
Re: some physics
Reply #2 - Nov 1st, 2005, 9:42am  
That's damn good!

Fantastic contribution.
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beachmeat
Re: some physics
Reply #3 - Nov 1st, 2005, 10:57am  
Thats fantastic! Thanks a lot. The tendrils example looks really sweet if you make loads of little ones.

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home sweet home
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mflux
Re: some physics
Reply #4 - Nov 18th, 2005, 12:47am  
Hey Traer
This is fantastic :]

Can you please expose the code for your implementation of Runge-Kutta? I'm very interested in how you wrote it.

Thx!
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Portfolio
fluxhavoc  
traer
Re: some physics
Reply #5 - Nov 30th, 2005, 4:23pm  
You should have a look at these:

Pixar Particle Physics Notes from SIGGRAPH 2001:
http://www.pixar.com/companyinfo/research/pbm2001/notesc.pdf

Wikipedia article on Runge-Kutta solver:
http://en.wikipedia.org/wiki/Runge_kutta

i basically just stuck those together.
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mjull
problem with library
Reply #6 - Feb 6th, 2007, 2:12am  
I am using 0123Beta Processing and this library is pretty buggy. Any chance the author has an update?

thx, matthew

p.s. I get error mesages like:
C:/DOCUME~1/mj/LOCALS~1/Temp/build59836.tmp/Temporary_1979_2829.java:71:17:71:26
: Semantic Error: No accessible field named "LINE_STRIP" was found in type "Temporary_1979_2829".
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st33d
Re: some physics
Reply #7 - Feb 6th, 2007, 11:02am  
If the bug was in traer.physics, you would see the error coming from the library.

A big clue that tipped me off that it may be you at fault instead of traer is that traer.physics uses no drawing functions, LINE_STRIP is a deprecated part of the Processing drawing api.

http://processing.org/download/revisions.txt

Perhaps you are using an old example on the traer.physics page?
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mjull
Re: some physics
Reply #8 - Feb 6th, 2007, 3:46pm  
thanks for the response... on looking closer, the examples on the traer physics web page have syntax problems now that processing has undergone a revision. for example, beginshape(LINE_STRIP); is now beginshape();and framerate(); is now frameRate();

mj-
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Pankaj
Re: some physics
Reply #9 - Sep 11th, 2007, 7:13am  
Is this open source? I want to extend it for some specific simulation.

Thanks
-Pankaj
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lluj
Re: some physics
Reply #10 - Nov 9th, 2007, 11:43am  
Hi,

the library is really nice indeed. I happen to have a problem that looks like a bug. (not sure maybe my fault Wink)

I wrote a quick and dirty import from graphviz .dot language

www.graphviz.org

and wanted to display the graph using the library. It works fine as long as the graph is a tree. if I add a single link that creates a cycle, the positions I get are NaN.

I suppose the equation system is stiff and the solver doesn't like it, but still diminishing the step size did not help at all.

you can have a look at the example there

http://luj.ex-haro.net/debug/example/physics/

and the bug there

http://luj.ex-haro.net/debug/example/bug/

thanks for any help.

lluj!
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