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Add velocity into Alembic loaded from external.

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the particle shape from other DCC tool with alembic file format,
the alembic do not have velocity data.

particles count changed frame by frame (has life-span, are delete by age), connectivity class id is changed frame by frame,
thus, i cannot track the velocity.

Alembic(delay_load?) -> Connectivity ->Trail(recompute_velocity)

do you have any way fo this case?


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