Andrew Cocker wrote:
> 
> [...]
> 
> If this is correct, is there an easy way of determining what the range of masses or
faces
> belong to which group?

You already mentioned it in your last post, use something like:

#declare Start_Mass_Part1=mechsim:mass_count;

during creation of the masses and you can determine the mass indices of
the different parts.

I will consider adding 

mechsim:mass(Index):group

etc. in some future version but it isn't that useful after all.

Christoph

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