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How to keep particle beams fixed to their source and target points

I am trying to fix a particle beam to two points in order to make a laser pointer for VR, but the laser won't stay completely fixed to the two points I am fixing it to on every tick.

This video shows my issue: https://drive.google.com/open?id=19kaXSNycBgdFrzPHHMiwIOQbYQbvkc30 alt text

Product Version: UE 4.19
particlesystem.png (121.8 kB)
bp.png (441.1 kB)
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asked Jul 17 '18 at 01:08 AM in Blueprint Scripting

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