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[Chareyre <674000@xxxxxxxxxxxxxxxxxx>]

Consider unrolling comment #10. It mixed quotes and reply. I don't know
if it should be considered a bug or not, but bug description is correct
: homo=1 breaks the incremental algorithm. homo=2/3 fixes the problem.

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homoDeform=1 does not handle the periodic case correctly.
https://bugs.launchpad.net/bugs/674000
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Status in Yet Another Dynamic Engine: Invalid

Bug description:
Currently, in the periodic case, if homoDeform=1 (alias Cundall way) we do not adjust the values of the relative velocities as according to the velocity gradient. This should be done, since, in such a case, we only update particle positions and not particle velocities.