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 (shown in faded green). However, as the narrowing gets smaller, some of the particles start bouncing up and down rather than going thru (they are pooled up on the left). Is there a way to prevent that? Maybe an expression which would delete them if their movement in X is below a threshold?
Thanks