08-12-2020, 02:47 PM
Did you consult the docs and also look at the official particle groups sample scene that explains how they affect PhysX sims? 
I can see from your screenshot why the simulations would be different...
Sim groups work the same as collision flags in Unity, if you are familiar with that. Particle groups must overlap in order to collide. It's an easy way to filter out specific collisions for particles.
I can see from your screenshot why the simulations would be different...Sim groups work the same as collision flags in Unity, if you are familiar with that. Particle groups must overlap in order to collide. It's an easy way to filter out specific collisions for particles.