GE = o.labeledEngine('GravityEngine') (check the name of the class
maybe in YADE_CLASS_BASE... of the .hpp)
(If the engine is labeled, it should be accessible automatically)
Then you should have the possibility to modifiy easily the value of
one of his attribute, with :
GE['gravity"]=...
GE.gravity is "better" in the sense that GE['gravity'] will be removed
at some point in the future (I just added warning about that syntax to
code).
Cheers, Vaclav
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