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[Chareyre <bruno.chareyre@xxxxxxxxxxxxxxx>]

geometric distance (radius1+radius2) should be preferred, definitely.
InitialEquilibrium distance is only creating strange effects (i.e. loose
and re-create the same contact and you get different initial value,
meaning you gain or loose volume or mass). For continuum-discrete
approaches, I understand some need that, but for real granular materials
it makes non sense.

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Equilibrium distance different for SpheresContactGeometry and Dem3DofGeom_SphereSphere (TriaxialTest with facet vs. box walls)
https://bugs.launchpad.net/bugs/399963
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Status in Yet Another Dynamic Engine: In Progress

Bug description:
Seems that there is too much friction with the walls, but inspecting the XML file gives nothing suspicious. UnbalancedForce sits constantly at 1.1407 after a small while, without going down.