[Opensim-dev] Update libode, or work towards better physics handling in this libode revision?

[Mike Pitman]

Teravus,

Though I haven't been into the ODE code specifically, I might be able to
help with calibration/improvements/developing tests for physics updates. Is
there an entry point you could suggest? What is the current approach to
integrating physics updates presently? Are there currently tests that vary
the time step size and measure consequences? I'm assuming we're not trying
to conserve energy here, so 'good enough' and 'better' physics will be
subjective, but there should be reasonable tests with definable tolerances
for both regression and validation. I'd be happy to help if I can.

-Mike / Rez




                                                                           
             "Teravus Ovares"                                              
             <teravus at gmail.co                                             
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                                       Re: [Opensim-dev] Update libode,    
                                       or work towards better physics      
             10/06/2008 11:22          handling in this libode revision?   
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We can expect a week long calibration process, probably every minor
version update.

As far as I know there are a few compelling 'features' that one would
want, though they're not mission critical.

A few that come to mind;
The Sweep and Prune space
The Convex hull-Convex hull collider
Bug Fixes.

Best Regards
Teravus

On 10/6/08, Mike Mazur <mmazur at gmail.com> wrote:
> Hi,
>
> On Mon, 6 Oct 2008 23:04:44 -0400
> "Teravus Ovares" <teravus at gmail.com> wrote:
>
> > Just wanted to let you know that there are some differences in the
> > latest ODELibrary 0.10.1 that mean that I'll have to update the
> > frequency we collision test and re-calibrate the world. (a week long
> > process probably)..   So
> >
> > Where does the community want to go?
> > Keep the libODE that we have currently and make physics better using
> > it, or update to 0.10.1 calibrate the world to that, and then make
> > physics better.
>
> What are the benefits of updating to 0.10.1? Are there any significant
> improvements over the existing version?
>
> My gut says update to 0.10.1 now. Say they release 0.10.5 in a few
> weeks with some changes that make it very worthwhile to upgrade, then
> you'll have to calibrate the world anyhow.
>
> How often can you expect such changes in ODE that force a week-long
> recalibration process? If this happens every release, then perhaps it's
> better to wait for a must-have upgrade.
>
> Thanks,
> Mike
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