[fluxus] segfault in physics engine

[Dave Griffiths]

Hi Claude,

> The attached script segfaults fluxus here, when the first sphere
> collides with the ground plane.

This is an honest real crash, not a garbage collection crash - I could
almost weep for joy! ;)

I'm not sure what this is yet, although you are doing some things in ways
I probably wouldn't, setting things active while they are grabbed for
instance - which is not to say they are wrong, its just that they may
highlight a problem I haven't seen before.

I'll keep you posted,

cheers,

dave