Reusser wrote:
> 
>    I read the fine manual regarding mechsim, but couldn't find an
> obvious way to do what I want to do.  Is there a way to specify *which*
> groups to collide?  Using collision type 2, it will only test for
> collisions between elements of different groups, but this still means a
> lot of collisions when there are a fair amount of groups.
> [...]

You cannot select specific group combinations to test for collisions but
note that in your example there is no reason why a certain combination of
groups should be unnecessary to test - every mass could collide with every
other under certain circumstances.

Christoph 

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