That's really cool, David.  Thanks!  I haven't played with ElastoLab,
but I see you have a trial that I will be downloading soon.

As far as licenses go, you might check out the MIT license:
http://minnow.cc.gatech.edu/squeak/32

There is some consensus that this is a good license to release Squeak
code under, since we hope to eventually move away from the Squeak
license (because of inconveniences due to its Apple-centricity), and
one way to do this is to release all new code under a different
license.

Joshua

On Mon, Sep 08, 2003 at 11:51:19AM -0400, David Buck wrote:
> I'm releasing the ElastoLab physics as open source and I've ported it to 
> Squeak.  If you'd like to try it, visit:
> 
>    http://www.simberon.com/Services/SmalltalkSoftware/
> 
> The classes in SimulatedPhysics.st offer basic physics simulation of 
> particles, gravity, air resistance, springs and elastics.  This code is 
> fairly clean and works quite well.  The code in 
> SimulatedPhysicsAdvanced.st covers barriers and rods which are much more 
> computationally difficult and contain some messy code and algorithms.  
> The code in SimulatedPhysicsTestcases.st provides testcases for some 
> things in the SimulatedPhysics.st package but doesn't yet test the 
> advanced code.  At this time, there is no additional documentation.  I'd 
> suggest just looking at the testcases and trying things from there.
> 
> There's no GUI with this code.  I'd like to see what other people can do 
> with it.  The SimulatedPhysics part should be fairly easy to convert to 
> 3D if you wish.  The Advanced part is much more difficult to make 3D 
> because of rods need a tensor matrix instead of just a number for the 
> moment of inertia and because of barriers which require a 3D plane model 
> instead of just a line.
> 
> If you'd like to see what this physics code is capable of doing, check 
> out ElastoLab at:
>     http://www.simberon.com/home.htm
> 
> I'd like advice from the Squeak community on license options.  I could 
> use the Squeak license (although its references to Apple seem strange in 
> this context).  What do other people do?
> 
> Anyway, for now, the code is there and you can play with it.  If you 
> have any improvements or enhancements, e-mail them to me and I'll put 
> them up on the site.
> 
> Have fun - that's what it's all about.
> 
> David Buck
> Simberon Inc.
> www.simberon.com
> 
> 
>