[ODE] New Physics SDK released

[Adam Moravanszky [Novodex]]

Hi,

> The expected timestep in the new solver is 60 Hz, i.e. console people are

Almost all the SDK demos are actually running at 50Hz.  Of course the SDK
will run at whatever rate
you specify.

--  Adam

----- Original Message ----- 
From: "Pierre Terdiman" <pierre.terdiman at novodex.com>
To: <kronos at mtcelestia.net>; <ode at q12.org>
Sent: Thursday, February 19, 2004 3:11 PM
Subject: Re: [ODE] New Physics SDK released


> > the solver seems to be taken almost verbatim from Pierre Terdiman's
> Flexine.
>
> No, we rewrote it.
>
> My previous solver (http://www.codercorner.com/Rigid.htm) was O(n) but
> needed very small timesteps to be robust (the default mode was 250 Hz).
This
> one is O(n) but works with bigger timesteps (default is 60 Hz), so it's
> actually a lot faster.
>
> I included one of my old test scenes on purpose, so that people can spot
the
> obvious speed difference. In particular, this scene from my old Flexine
> physics tests:
>
>     "Physics_StressTest06d.zcb"
>
> has been included in the new Novodex SDK:
>
>     "Stress test 2"
>
> On my dev PC, my Flexine scene runs at about 20 fps before going to sleep,
> while the NX scene runs at more than 100 fps all the time. This is
coherent
> with the theory, since I run the simulation 250/60 = a bit more than 4
times
> more often in Flexine. If you change the timestep value in Flexine using
the
> appropriate dialog (menu Scene->Rigid body simulation), and set it to 50
Hz,
> the stacks just collapse...
>
> Short story : no, it's not the same solver.
>
>
> > it's a penalty-based method with a very small time step (seems to be
> around 2ms
> > in the demos).
>
> The expected timestep in the new solver is 60 Hz, i.e. console people are
> supposed to run one physics step / render frame. Simple.
>
>
> > but it has some inherent limitations.
>
> It probably has the same limitations as ODE's "fast step". I guess. I
don't
> know, I've never used ODE.
>
>
> Pierre Terdiman
>
> - Novodex AG (www.novodex.com)
> - Personal : www.codercorner.com
>
>
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