To make a beam fx:

make a material for electric:

the beam emitter:

a smoother curvy beam:

 

What I learned:

1. use min and max to set target length according to the size of the level.

2.Target Strength value decide how much curvy of the beam.

3. InitialTime and Initial Size affect the beam look a lot.

(TargetStrength This is a vector distribution (can be a curve) specifying the strength, or how hard the beam tries to follow, the tangent leaving the target.

When using a curve, this is calculated by finding the value of the distribution for the RelativeLife of the beam particle. )

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