Hello,
I’ve been working with the 4.16 FleX integration and I was wondering if there is any way to set up an angle of rest. There is already a sand particle component (Sand Castle & Sand Container) and some properties about friction, but it only slows down the collapse of the particles. It will only stop when the sand will be flat, even if they are collapsing really slowly. I would like to make them stop falling at somepoint. Otherwise, it is not realistic.
I have played a lot around the FleX containers properties, but havent had the to figure out where and how I can accomplish that. To set up an angle of rest.
is a part of video showing the FleX particle system using friction, compared to when not using friction. Obviously, I want a behavior like the second sand castle. Just to show approximatively what I want.
[video]Unified Particle Physics for Real-Time Applications (Nvidia FLEX) - YouTube
I’m guessing it is not an easy request, but if someone got an idea or if someone has some experience with FleX, any help is welcomed! 
Thanks a lot!
-Reelie