RE: Curious
With last years introduction of Mesh came a little-known change.
Previously, setting an object Phantom would reduce lag by removing it from collision detection during the physics phase of simulation.
This is no longer the case.
Since the Mesh roll-out, Phantom does not remove the object from the physics phase.
To do that, you must, instead, use the new Prim Physics settings (on the Features tab of the Edit panel, also scriptable) and set the object, or just parts of it, to PRIM_PHYSICS_NONE.
And, yes, this applies to non-Mesh objects and parts.
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