As with prim sitting avatars, make an avatar phantom when it sits on the ground and solid again when it stands.
As with prim sitting avatars, make an avatar phantom when it sits on the ground and solid again when it stands.

This is to avoid http://opensimulator.org/mantis/view.php?id=5783 when a collision with a ground sitting avatar causes that avatar to automatically stand and sometimes not be able to move
A better solution may be to keep gound sitting avatars solid but remove their collision status.  However, this requires some physics code work.

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