26-03-2020, 12:06 PM
(This post was last modified: 26-03-2020, 12:13 PM by josemendez.)
(26-03-2020, 11:56 AM)Ronnie Wrote: In your video I saw a part called Diffusion which showed same sand as the kinetic. How to have that? And will that be mobile friendly
You mean in the promotional video? That would be the "Raclette" sample scene at 0:48, I guess?:
This particular scene runs at roughly 60 fps on a quad-core CPU w/hyperthreading, so unfortunately won't run as fast on an average mobile device.
Still, the viscosity shown is way lower than that of kinetic sand (the sand keeps its given shape much better). In addition to that, kinetic sand is a non-newtonian fluid. This means its viscosity properties change according to stress: if you gently push the sand, it will exhibit low viscosity, acting more fluid-like. If you compact it, or violently hit it, its apparent viscosity will increase substantially, behaving more like a solid. This trait is what allows you to compact sand then cut it with a knife, or gently pour it from your hands for a fluffy, soft look. Obi cannot simulate non-newtonian fluids: viscosity is fixed and independent of stress.
Don't even try to simulate this in a mobile device. Even in offline sims, using a powerful desktop computer, its quite hard and extremely costly to pull this off. It takes RealFlow (state of the art fluid simulator for VFX) around 10 hours to simulate just a few seconds worth of kinetic-sand like behavior. Doing this in a mobile device, in less than 16 ms/frame is... well, impossible.