Скачать или смотреть UE4 GPU Particles: Water Shower

A quick test of using GPU particles for a flowing water shower. It's really not that bad. There are some limitations: GPU particles will fall right through any area that is not visible onscreen, whether it's hidden behind another object or simply not in view of the camera. So if you're planning on making a river flow like this, you can't just have one system at the top of the river and expect it to flow down. But for rain, small simulations, and overall appearance, yeah, it works great!

This video was recorded in realtime 1080p on an NVIDIA GT 640 (~27 frames per second, in-editor). I get a performance boost to 42 FPS when playing at half the native resolution, also in editor. I can probably increase the performance to 50-60 if I got rid of the foliage.

Collision Resilience - 0, or a low value below .05. Water should flow, not bounce
Collision Friction - 0. More friction results in more viscosity, but should be kept low to allow flow.
Collision Response - Bounce
Drag - 0-0.7 works great. More drag results in more viscosity, and a "heavier" appearing liquid. Water is pretty heavy, but it's not sludge, and has little air resistance.
Const Acceleration - -400 in the Z direction works nicely. A lower value would increase the force of gravity, but then the particles move too quickly.

Screen Alignment - PSA Velocity
Size by Speed, Speed Scale - 0,1
Size by Speed, Max Scale - 0,2

I spawned at a rate of 10,000 particles per second with a lifetime of 3 seconds.