about set-density

Naiqi Weng <[email protected]>
Newsgroups gmane.comp.breve
Message-ID <[email protected]>
hi, I am a new user of breve. 
When I am writing a code to equilibrate the object(it is physics-based), I find it seems that the set-density method in class "Shape" doesn't work, I mean when I use this method to change the density, the force to counteract the gravity force is the same.
 
Also, I want to know if there is a method which can give a Multibody object an instant impulse,not just the constant force.
 
Thanks a lot for anyone who can help!
 
Tracy

		
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