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[Bug 850864] Re: strange facet-sphere behaviour

 

Hi guys,

have a look at the attached script. There is for sure a problem when
spheres collide with facets. However, the behaviour is very strange and
the problem does not appear always. If you have a look at the plot of
the script you will see that the problem appears at the fourth
collision. Actually I tried to play as well with the damping coefficient
and the time step and for some configurations there is no problem (e.g.
use dc=0.1).

In addition you can change the parameters in the script and you can see
that the behaviour is very strange if the sphere collides with corners
as well (e.g. use b=0, change z...).

Well, this is very strange, any comments? And regarding this bug, I
think we should change the priority and fix it is asap.

Cheers

Klaus


** Attachment added: "Example witch shows strange behaviour"
   https://bugs.launchpad.net/yade/+bug/850864/+attachment/2622507/+files/freefall.py

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https://bugs.launchpad.net/bugs/850864

Title:
  strange facet-sphere behaviour

Status in Yet Another Dynamic Engine:
  Confirmed

Bug description:
  See https://answers.launchpad.net/yade/+question/171223

  Spheres that are exactly on an edge between facets behave strangely.
  Maybe related to other (closed, but never solved) bugs in sphere-
  facet.

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References