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[Václav Šmilauer <eudoxos@xxxxxxxx>]

> pp={'se3':[center[0],center[1],center[2],1,0,0,0],'refSe3':[center[0],center[1],center[2],1,0,0,0],'young':young,'poisson':poisson,'frictionAngle':frictionAngle,'inertia':[0,0,0], 
> 'velocity':[velocity[0],velocity[1],velocity[2]]}
You have to use TranslationEngine and subscribe facets to it. That's 
what I do. See e.g. scripts/test/Dem3DofGeom.py for an example. The 
sphere is moved that way. Facet ids are returned by O.bodies.append.

ids=O.bodies.append([utils.facet(...),utils.facet(...)])

print ids ## [0,1,2,3,4]
O.engines=[...,TranslationEngine(subscribedBodies=ids,translationAxis=[0,0,1],velocity=1),...]

HTH, Vaclav