This movie shows how PPassAB works in Thinking Particles.When PPassAB checks between Mole particle and Ground particles, if distances are closer then Ground particles go up higher. If Ground particles are outside of specific distance from Mole particle, they don't move.In this case, PPassAB searches only 10unit Radius.
There are 200000 particles on the ground. Each Ground particles are connected camera map node. Then they are assigned back ground image from camera.
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