This compound reduces the number of particles that are emitted based on the luminance (brightness) values (using an image or sequence) of a texture map on the emitter object: the darker the area of the texture map, the more particles are blocked from being emitted.
Make sure to first create a texture map for the emitter object (Get Property Texture Map).
Plug this compound's Execute on Emit output into an Execute on Emit port of the Emit compound or into a port on the ICETree node. If you do the latter, the emission is updated at each frame.
For more information, see Filtering Particles Based on a Texture Map [ICE Particle Simulations].
Tasks: Particles/Emission Control