[ODE] reverse timestep?

[Mike Reinstein]

Interesting Idea Tyler.

I don't know a lot about ODE internals but it seems to me that supporting 
negative timestamps in the ODE core wouldn't be a trivial task, because a 
lot of the system's state information cannot be reversed easily. There are a 
lot of 1 way trap door operations that result in intermediate results 
getting mangled, and a lot of those intermediate results would be needed to 
backstep; In short, there would need to be a considerable amount of state 
information that would need to be kept in order to facilitate reverse 
timestepping.... Can someone confirm or deny this? Ive wondered the same 
question myself...what's the best way to go about this?

>From: Tyler Streeter <tylerstreeter at yahoo.com>
>To: ode at q12.org
>Subject: [ODE] reverse timestep?
>Date: Mon, 3 May 2004 08:14:30 -0700 (PDT)
>
>Is it possible to run a simulation in reverse?  I was
>wondering if I could run my simulation for a while,
>then run it backwards from the end to the beginning.
>
>I thought maybe you could simply reverse the direction
>of all forces, torques, and velocities.  Would that
>work, or is there a lot more to it?  If it were that
>simple, it would be nice to add this functionality to
>ODE and be able to just pass a negative timestep to
>the solver and have it do this automatically.
>
>Tyler Streeter
>
>
>
>
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