[ODE] Running ODE backwards in time?

[Jon Watte]

It is not, generally, possible to run a simulation backwards, 
because of the singularities when more than two objects interact, 
and the "sharp edges" of constraints (think of friction for 
example).

I e, there are many possible inputs that would yield the same 
output of a specific physics step. When running "backwards" you 
have no idea which of those inputs actually generated the output.

Cheers,

		/ h+


-----Original Message-----
From: ode-bounces at q12.org [mailto:ode-bounces at q12.org]On Behalf Of
mtoussai at inf.ed.ac.uk
Sent: Monday, November 15, 2004 12:00 AM
To: ode at q12.org
Subject: [ODE] Running ODE backwards in time?


Hi there!

I need to run some simulations backwards in time (for some planning
algorithms..). I know I could do this by inverting all dynamic properties
((angular) velocities, accelerations, etc.) of the system and running ODE
forwards. But is there a simpler way? Just setting a negative time interval in
a step function doesn't work.

Thanks!
Marc.
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