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[sega <sj2001@xxxxxxxxx>]

> If GravityEngine is resizing - it is doing that only ONCE. In fact
> the first engine in the loop that assigns any PhysicalAction is
> responsible for this resizing.

Not once! It is doing resizing in each case when body_id > physicalActions.size()!!
So, in a parallel loop a first thread will be crash because a second thread (with greatest body ids)
will doing resizing on each loop iteration. Although this is happens only at the first iteration simulation... so only once.

-- 
Best regards, Sergei D.