What is the best way to create a grid of lines (like power-lines) in 3D and showing the movement (direction) of the electricity.
Simple example: https://i.stack.imgur.com/cgdrG.gif
I’m new to playcanvas, so go easy on me 
Easiest way would be to create a mesh outside of PlayCanvas and map UVs in a way to make texture follow the path. Then just put the texture in emissive slot of the material and increment material.emissiveMapOffset in a script.