I'm trying to prevent my Particle Fluid Emitter from emitting particles in areas where there is already density, similarly to how the ‘Kill Inside’ works in a Source Volume DOP. According to the help for the Particle Fluid Emitter, ‘Density Test’ should do that, but from my experimentation that option doesn't seem to do anything. I've tested the functionality in 12.0, 12.1, and 12.5. Has anyone gotten this feature to work, and if so could you explain how you got it working?