I want particles to grow along a oil slick on the ground. I thought I could lay down a decal that shows the growing oil slick and from that mask I could also emit fire particles? But I haven’t been able to figure out a way to get particles emit from a material. Is it possible?
not directly, no. one trick that may work is to use the same texture mask in the particle material and use it to scale the particles so they become invisible. using it to affect opacity would work as well, but that obviously has unnecessary overdraw.
Pretty sure you can do that using PopCornFx plugin for Unreal.