Question #692392 on Yade changed:
https://answers.launchpad.net/yade/+question/692392
Status: Open => Answered
Jan Stránský proposed the following answer:
These are limitations of the (explicit? not sure) discrete model, where
the values in one time step may differ in "actual" time
1) have a look at the O.interactionLoop. Ig2 (where penetrationDepth is
computed) is before NewtonIntegrator (where the position are updated).
After one simulation step (one execution of O.interactionLoop engines) you have
"old" penetrationDepth even the particle position are "new".
2) is very similar.
After script1, you already have "new" positons, from which penetrationDepth in
script2 is computed, but if you just print penetrationDepth in script1, you are
getting "old" values.
You would have to set O.dt=0 also for the last step in script1 to get
the same values in both script1 and script2
cheers
Jan
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