yade-dev team mailing list archive

[Luc Sibille <luc.sibille@xxxxxxxxxxxxxx>]

Ok thank you, on my side I have got a case of sample creation under 
gravity (where particles fall under gravity and move a lot) where it 
happen's systematically. As soon as an external confinement (isotropic 
compression for instance) is applied the problem disappear. I imagine 
that is because in this latter case, particles are much more locked with 
very low angles of rotation at each time step and consequently maybe 
less opportunity to obtained a quaternion with a norm different from 1 
after a composition of rotations.

Luc

Bruno Chareyre a écrit :
> Luc, if you want to investigate nan's with quaternions, you can try 
> rev2511 with #define Q_DEBUG.
> A good example to show the problem is 
> scripts/test/chained-cylinder-spring.py
>
> B.
>
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--
Luc Sibille

Université de Nantes - Laboratoire GeM UMR CNRS

IUT de Saint Nazaire
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44606 Saint-Nazaire Cedex, France

Tel: +33 (0)2 40 17 81 78