[ODE] how to debug and fix NAN values

[Hampa]

Hi Lewap,

No, not yet.

I am out of the office until next week. I will continue looking for  
it then.

If I resolve it I will reply to this thread.

cheers,
hampa

On 06 Nov 2007, at 12:32 AM, Paweł Kmiotek wrote:

> Hi, Hampa have you found the solution ? I have simliar problem.
>
> I'm curious maybe you have found something that would help me.
>
> Best regards,
> Lewap
>
>
>     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.
>
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