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Index › Discussion › Exhibition › dook*
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dook* (Read 1360 times)
introspector
dook*
Oct 21st, 2009, 12:35pm  
dook* is a simple & sketchy catenary cloth modeller.

...


it uses traer.physics for particle spring simulation.

source + applet here:

http://www.introspector.be/index.php?/research/dook/
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liudr
Re: dook*
Reply #1 - Oct 28th, 2009, 1:17pm  
Very nice. I wish I had something like this last semester when I was teaching classical mechanics. Could you briefly tell me how you did your calculation?
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num3ric
Re: dook*
Reply #2 - Oct 28th, 2009, 6:08pm  
Very nice! The different modes are great!
Have a look at my version if you want, www.num3ric.com.
It's the fifth icon.

Or the direct link: (Use ARROWS and SPACEBAR)
http://www.er.uqam.ca/nobel/r13075/num3ric/proj/catenary/applet/index.html

What I'd like to try is to make a spherical one, where the gravity is all toward one point in the center.

Eric
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PhiLho 
Re: dook*
Reply #3 - Oct 28th, 2009, 11:03pm  
liudr wrote on Oct 28th, 2009, 1:17pm:
Could you briefly tell me how you did your calculation

instrospector can probably answer better than me, but he already says that he uses traer.physics which probably does most of the calculations. These are based on attractions/repulsions/constraints (of particles, the sketch probably "just" visualize the network of forces between them), using some form of numerical integration (Runge-Kutta 4 for Traer, IIRC).
The sources (of the sketch, and of the physics library) are available...
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introspector
Re: dook*
Reply #4 - Oct 29th, 2009, 12:53am  
PhiLho is absolutely right.  The physics calculations are done by traer.physics library using Runge-Kutta 4 integrator.  

Every vertex of the mesh represents a particle with a certain mass, while every edge represents a spring between two particles, which has a certain strength and a rest length.  

In this version all particles have the same mass, all springs have the same characteristics.  a few of these particles are fixed (corners, sides and some random).

As said in the source, i'm working on a version where particles and springs characteristics will be editable, and that allows other topologies then the rectangular grid.


@num3ric:
good to see yours, and such nice commented and structured code Wink
i should learn that. The different modes was one of the things i wanted to learn by doing this.  check out wbluts version of it: http://www.flickr.com/photos/wblut/4033138486/
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