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[Václav Šmilauer <eudoxos@xxxxxxxx>]

I think you lost track of current development.

Since about 2 weeks back, Body::isDynamic() is a function; it still
accesses Body::dynamic (not to be accessed directly) and at some point,
when we check that engines that need it are updated, it will only modify
State::blockedDOFs accordingly (DOF_ALL or DOF_NONE); then it will be
completely removed perhaps (?)

-- 
Body::isDynamic semantics is not clearly defined
https://bugs.launchpad.net/bugs/398089
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Status in Yet Another Dynamic Engine: Confirmed

Bug description:
Does isDynamic means that Newton's laws skip the body? Or that forces don't contribute to its velocity? Various Translation/RotationEngines rely by convention on that Newton's laws skip the body completely.

There was a discussion on that topic http://thread.gmane.org/gmane.science.physics.yade.devel/1059 and we should draw conclusions now.