I am currently creating particle systems and scripts to generate giant explosions of varying sizes.
One of the effect I am trying to create is dust rising from the ground as the explosion nears. I am currently doing that with a very fast particle emitter, emitting thousands of invisible particles that generate a dust spray on collision. The results are however unsatisfying. To create nice effect, I need tens of thousands of invisible particles, which is way too much.
I am looking for a way to simply extend the spawning zone of the particle emitter, and that it automatically emits dust on every surface available.