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Eliminate problem particles?
Hi all:
I have an animation where I am using particle playground to send particles down a curved tube – to represents platelets in an artery.I have a mask to contain the flow. The mask is animated to make a narrowing in the artery and the particles follow it pretty well. I have a gradient to speed them up as they go thru the narrowing. However, as the narrowing gets smaller, some of the particles start bouncing up and down rather than going thru. Is there a way to prevent that? Maybe an expression which would delete them if their movement in X is below a threshold?
Thanks.
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2 Replies
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Never used Particle Playground in all my years. Foam uses gradients to control particle flow and it requires shades of gray to do the task. The reason is that the shades have a gradual effect on velocity and direction. control layers that have only black and white areas do not interact with particles gradually. A particle can, for instance, move across the white area and hit the black area going to fast for it to be redirected or slowed down.
But that’s how Foam works.
I don’t know of a way to address individual particles with scripts or expressions.
bogiesan
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Thanks for the response. I haven’t tried foam, but reading the help file, it doesn’t seem like you can animate the shape being filled w/the foam particles. Is there a way to do that? Basically I want the particles to flow down a curved tube (cut in half the long way) and then pinch the tube and have the particle flow thru the pinched part and speed up as they do, then slow back down after they’ve passed thru the pinched part.
If you know of a way to pull that off, I’d appreciate it.
Thanks.
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