How to understand getStress？

Hello,
getStress() function computes the result based on normalForce and
shearForce of interactions. BubblePhys is one of a few IPhys classes, that
does not have shearForce.. The code probably should throw some error, but
it does not so you get a strange result..

If you change BubbleMat to FrictMat, it should work ok.. What material are
you using in other simulations?

cheers
Jan

2017-01-07 14:57 GMT+01:00 张文卿 <email address hidden>:

> New question #432620 on Yade:
> https://answers.launchpad.net/yade/+question/432620
>
> I‘m using getStress（） to monitor my 'peri'.In doucumentation,it says
> stress is negative for repulsive contact forces.So,I wanna try if
> it'scorrect.I used it for a simple example:bouncingbubble.py.And something
> wierd show up.Stress is(nan，nan，nan，0,0,12.644,0,0,34.8838）.Can anyone
> explain that?
>
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Hi Jan,
I'm not sure we can something about it.
I think static_casting to wrong type has undefined behavior, and "undefined" include the possibility of continuing silently...
A debug build would show the error very explicitely though (since it would be a dynamic_cast).
Bruno