POP particles moving between two points

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Hi!

I have a little struggle with pop setup - I have a two points ("a" and "b") and I want to spawn a partilce in point A and moves to the point B and then dies, at the same time I want to particle that spawns in point B move to point A and then dies. I've manage to create basic setup(adding a pop attract with match method "point per particle"), but my problem is how to kill particles when they are close to the goal?

Thanks in advance!
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Adding a "popproximity" node to the particle sim which will create a "nearestdist" attribute on each point/particle that can be read using a "popwrangle".....if its in range etc then set the attribute "life" = 0 or "dead" = 1 to kill the particle.
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It works perfectly! thanks!
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