My second Houdini sand experiment. Still a lot of things to improve, but also a good starting point.

Houdini version: 12.5.316.22
Particles count: 500k
Simulation time: 2 minutes (Intel Core i7 2675QM)
Rendering time: 89 minutes (same CPU, Mantra PBR with DOF and m.blur)

Loading more stuff…

Hmm…it looks like things are taking a while to load. Try again?

Loading videos…