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Niagra Beam Emmiter Start and End

I need to have a Beam particle system that gets a start and end point from 2 actors in the game.

I am trying to create a dynamic slice mechanism where on Mouse down I set the start point, and on mouse release I set the end point, and the particle beam is the slice that would have the collision /dmg. Basically, a non animation based slice.

I tried to do it with a spline, and was thinking that the beam particle might be the better route.

Any tutorials or guidance would be great!

Thanks so much for any pointers in the right direction.