these are really nice looking
.https://playground.babylonjs.com/#NIHF76#2
here is a video and playground for using the nme to create particles.
Besides the NME video and example, there is also a 3 part series on the babylon youtube channel for the particle editor.
here are some reference images of sparks. your pg kind of reminded me of industrial style sparks, so that was kinda what i was going for.
google search “weld”
google search “metal saw sparks”
