Utility script hooks user motion (from depth camera) to fluid sim timescale with a fairly quick smoothing/falloff - so a bit like SuperHot, where the sim only updates/moves when you move.

Scaling and threshold values I chose on laptop aren't working fully on big screen, as the sim timescale isn't dropping completely to zero (fully pause) when I stand still - I'm further from the depth camera than when test on laptop so there's enough noise in the depth readings that it always registers that I'm moving.