Re: [Pyode-user] dependence upon position?

[chris <dra...@gm...>]

On 11/28/06, Matthias Baas <ba...@ir...> wrote:
> chris wrote:
> > FYI, I get this error for all versions where I set CFP and ERP to 0,
> > including 10, 1000 and 10000 from the origin. For example look at the
> > attached and see the difference in rest position,
>
> When CFM and ERP are both 0 I get the LCP error in every step. I think
> an ERP of 0 doesn't make any sense anyway, does it? I wonder why the
> collision is resolved at all. Doesn't ERP=0 mean that the joint force
> isn't taken into account at all?
> Similarly, I also wouldn't recommend a CFM value of exactly 0 (see the
> ODE manual: "In fact, if the system is mis-behaving, one of the first
> things to try is to increase the global CFM.")

yeah it probably is not sensibel to set these to zero. I just didi it
because someone suggested it and I thought I would prove that it still
does not remove the problem (it fixes it for displacement of 10 but
not for general case).

>
> By the way, as was mentioned in a previous mail, if you switch to
> quickStep() there's no error message anymore (but the movement is not
> identical anyway).
ok
>
> Anyway, as these things happen right inside ODE and are not particular
> to PyODE I recommend to post a message in the ODE mailing list.

yes, will do, bit busy atm - at a conference,

cheers,

chris
>
> - Matthias -
>
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