To make a Enlarge outwards fx:

First, creat a texture with alpha channel:

 

   

Next, use the textures to make materials: #1. material forenlarge circle

Materil parameters :

Then, make a single particle using the material above

What I learned: texture coords 1 and 0, Frac, and Abs, with a gradient map to enlarge a texture form center out.

 

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