Particles collide with PhysX Shape?

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Any particles that you want to collide with PhysX particles must also be PhysX particles themselves....unless you're fine with simple radius-based collisions, at which point the Particle Physics operator will be fine.

However, if using Particle Physics, make sure you uncheck "affect this event only", so it considers particles from other events for its calculations.

I am trying to sim fine sand, so i'm looking at millions of particles. So it's fine they just have a collision radius, they don't need a complex collision shape. So wouldn't the PhysX particles be way harder to simulate if i'm trying to simulate so many particles? But guess that's the only option if there is no way to have PhysX particles collide with normal particles, i just feel like i'm missing something. Like if you have a box of sand and drop chunks of rocks into it. How would you simulate that then? Just all PhysX?

Look at the snowman example I uploaded to the Gdrive folder. Its a starting point.

But the easiest way to do would be a cascading sim: First sim the physx particles, then sim the grain and simply pick the physx flow as collision shape.
As long as the physx particles are much heavier than the grain particles and are not being influenced too much by the grain, it should look fine.

But two way interaction between physx particles and particle bind particles is not supported so far (and also might not in the future).