Dynamic Paint particle growth
For this animation I used a dynamic paint canvas on a plane that emits hair particles based on a wet map. I used another particle system as the dynamic paint brush
you can download the blend file here
See also:
blender particle experiments - dynamic paint pseudo-reactor particles
AN experiment - force field curl clusters
twisted torus particles
particle density volumetric material
Volumentric emission shader
AN experiment - force field curl clusters
twisted torus particles
particle density volumetric material
Volumentric emission shader