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[Chiara Modenese <c.modenese@xxxxxxxxx>]

Hi,
I have been using clumps for a while but never found a problem with 
that. I am now using a release which is a bit older than the r3009 where 
this bug seems to be fixed. I never used gravity engine too. Could you 
please tell me how to reproduce the bug with a simple script?

Thank you.
Chiara


On 30/01/2012 21:42, Chareyre wrote:
> Workarounded in bzr3009.
> Would still be nice to really fix.
>
> ** Changed in: yade
>     Importance: Undecided =>  Wishlist
>
> ** Changed in: yade
>         Status: New =>  Confirmed
>

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developers, which is the registrant for Yade.
https://bugs.launchpad.net/bugs/923929

Title:
  OMP force container fails to reset forces on clump members

Status in Yet Another Dynamic Engine:
  Incomplete

Bug description:
  When clumps are used and no gravity engine is present, force containers are not reseting the forces on clump members. Junk values are accumulated over time and the clump itself soon disappears.
  A workaround is to addForce(0,0,0) once at startup on all bodies, this is done in Newton::action() currently.
  This is most probably (still to check) because containers sizes are checked vs. body Id only in addForce, which is never applied on clump members before they are in contact with something. Not clear is why the same problem does not appear also on standalone bodies.
  The crashing example was obtained from a series of personal scripts from Klaus Thoeni, not disclosed here.

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