[ODE] how to debug and fix NAN values
lewapq at tlen.pl
Mon Nov 5 09:32:58 MST 2007
Hi, Hampa have you found the solution ? I have simliar problem.
I'm curious maybe you have found something that would help me.
Message: 9 Date: Tue, 23 Oct 2007 00:16:33 +0800 From: Hampa
<hampa at toribash.com> Subject: Re: [ODE] how to debug and fix NAN
values To: "ODE Mailing List ((E-mail))" <ode at ode.org> Message-ID:
<E14E58FC-CE2C-4A46-BA7E-4003A5AD089B at toribash.com> Content-Type:
text/plain; charset="us-ascii" Hi Bram, It is the dNormalize4 (b->q)
in void dxStepBody (dxBody *b, dReal h) in util.cpp. This is called
from dInternalStepIsland_x2. I checked the values when entering the
dxStepBody function and (depending on scenario) the lvel, avel, facc
or tacc values have ended up as nan. With this I think I need to
figure out where in dInternalStepIsland_x2 the values are
introduced. /hampa On 22 Oct 2007, at 11:45 PM, Bram Stolk wrote:
> > Run the app in a debugger.
> > You wil get a call-stack.
> > We would like to know in what part of the code, the normalization
> > was called.
> > When I got this error, it was because I had a triangle that had a
> > zero-length edge.
> > Thus, two vertices co-incided.
> > Bram
> > On 10/22/07, Hampa <hampa at toribash.com> wrote:
> > Hi,
> > Every now and then my simulation produces NAN values, usually during
> > collisions using hi velocity objects.
> > In the debug build (lastets 0.9 svn checkout) I get asserts in:
> > ODE INTERNAL ERROR 1: assertion "bNormalizationResult" failed in
> > _dNormalize4() [../../include/ode/odemath.h]
> > What is the recommended way to debug and fix this kind of problems?
> > cheers,
> > hampa
> > _______________________________________________
> > ODE mailing list
> > ODE at ode.org
> > http://ode.org/mailman/listinfo/ode
> > --
> > Zapp: Captain's log, stardate...er..
> > Kif: Ohhh. April 13th.
More information about the ODE