thinkingParticles inMesh tricks

by Hammer Chen

(This article is based on thinkingParticles sample scene file "inmesh.max") Imagine you have particles scattering on floor, a moving sphere pass through the floor. You want particles outside of sphere color red, those inside of sphere color blue (with inmesh operator). If you only use one inMesh operator, those particle remain blue even if they are not longer inside of the sphere. You need two inMesh operators to control those who inside sphere shows in blue color, once they are outside of sphere, turn back to red.

Those outside particles once inside of sphere mesh, put them in "inside" group

those "inside" particles are NOT inside of sphere mesh, put them in "outside" group.

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