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OpenVDB 9.1.0
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v@P += v@v * dt; writes to the position attribute of the points `v@P`. Whenever position is written to in this way, the AX PointExecutable will move (re-bucket) points in PointDataGrids.float@density would imply a float volume called density. surface_a, will only be updated in surface_a's topology. Should we want a combined blend of non overlapping areas of both surface a and b, we would need to activate a's topology with respect to b first.