PhoenixFD + Vray issues

[Svetlin.Nikolov]

Hey,

So a few more updates:

- Seems like the cause of the slowdown is V-Ray Progressive + Volumetric Geometry - in this case 'Use Probabilistic Shading' does not work well and must be re-thinked for volumetric geometry, and unfortunately this is not a quick fix.

- I rendered the scene in 13 minutes with: Bucket Sampler, Min shading rate = 1, Min subdivs = 2, Max subdivs = 4, Noise threshold = 0.0; Light Cache enabled for all Phoenix simulators and Light Cache Speedup =0.999 for all Phoenix simulators; All the leftmost smoke opacity diagram points are moved to 0.001, and using the new build with the optimizations to modulating smoke opacity with a texture - forcing new nightlies right now and they should be out in an hour.

- My colleague working on GPU render elements might be a few days away from getting the zdepth element working with V-Ray Next GPU. We are yet to confirm this though, there might be issues until it's in the V-Ray nightlies.

Cheers!

[TomGore]

Thanks, I still have some debris to do before render, perhaps I will catch the nightlies before final render! What CPU you've been using with 13 mins' render time?

[TomGore]

I attach current state - 6 minutes per frame, volumetric only. Here I can handle it without postproduction at all, I guess:

[Paul Oblomov]

So it works in bucket mode or not ? Just wondering...

[Svetlin.Nikolov]

Paul Oblomov , yup, the problem is only with the combination of progressive + volumetric geometry. So far the drill was that if you are using progressive, you must disable Phoenix light cache, enable use probabilistic shading and render, but this is fast with volumetric and slow with volumetric geometry. So the workaround is that if you need volumetric geometry, you better switch back to bucket sampler, use Phoenix light cache and boost the light cache speedup.

TomGore , gonna send you the edited scene file in a minute - with the edits to the V-Ray settings and the Simulators' settings. My CPU is an i7-6800K at 3.4 GHz. Just got 12:35 with changing the Min shading rate from 1 to 3 like in your original setup, so now the sampler settings should match.

Hope this helps!

[TomGore]

Sure, waiting for files,
best

[Svetlin.Nikolov]

Hey, already sent them to the gmail you shared the original scene and caches from.