Houdini 18 Adaptive FLIP solver

Some incredible works by Igor Zanic with Houdini 18.
Adaptive FLIP pressure test system:
CPU: 2xXeon E5 V4 – 14core/28HT – 3Ghz
OS: Ubuntu Mate 18.04.3
The pressure field is solved on an adaptive (octree) background grid to significantly improve performance over solving with a uniform grid

In order to maintain high resolution details in the simulation, a band of fine grid cells are constructed along the boundaries of the fluid. The grid is then progressively coarsened into the interior of the fluid. To minimize the difference between the adaptive and uniform grid pressure solves, the adaptive pressure is up-sampled and smoothed back to the uniform grid before updating the velocity field.

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