To make a Laser cutting track fx:

 

First, prepare two textures as blow in PhotoShop:

 

Next, using the textures to make a material as blow in Unreal:

Then, using the material to make Particle system as blow:

What I learned:

1. Using alphaOverLife of Vector color to creat a process of movement.

(AlphaOverLife is a float distribution (should be a curve) specifying the alpha values to use for the particles.

This is calculated by finding the value of the distribution for the current RelativeLife of the particle. )

 

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