Resolution is 29.6MV. I did clean run without any possible background software using opencl, that didn't help. Also tried reducing Parallel Samples. I have attached project file, maybe it would help to recognize what's the reason (test at frames 110-170 where are more volumes). For now, my problem ...

@Nullifier:
I think you don't mind what happens to render speeds on smaller Step Lenghts. It makes smaller volume steps for dividing volumes and causes higher calculations. After some value your driver and Octane becomes unresponsive due high calculation. There is a TDR topic how to increase this ...

@Nullifier:
I think you don't mind what happens to render speeds on smaller Step Lenghts. It makes smaller volume steps for dividing volumes and causes higher calculations. After some value your driver and Octane becomes unresponsive due high calculation. There is a TDR topic how to increase this ...

UPD: Seems that issue is gone when I use my SSD drive instead of Hard Drive for TFD cache.
UPD 2: Issue is back, can't find any workarounds. Constant freezes, display driver errors.

I've got an issue. When I use low "Volume step length" settings, like 0.05-0.3, and try to render TFD simulations ...

MoGraph nested layers and Turbulence FD support is much awaited here! Thank you for your hard work aoktar.

jate wrote:What did you do for the foam in the coffee?

It's just a random texture of coffee with normal map generated from nDO, and simple specular map drawn above black spots. Also, slight sculpting on the mesh to give visual volume for foam.

Yes possible.
A trick to illuminate and detect noise sources: Everytimes use clay modes and different scenarios to see differents. Check different materials and light sources to found better ways. Also a reflective material can cause strange noises. Check materials and try with diffuse type to test ...

I don't think that time seems too long. He's only using a single card and heavy DOF takes a long ass time to become this clear at larger resolutions.
don't agree. Surely has weaker gpu and big res, anyway it should be possible to get much lower times. I say that because i can do it some appropiate ...

Nice but too long render time. Try to use coherent ratio, gi_clamp, causticblur=1, etc.. it should clean much faster
Thanks aoktar. I used coherent ratio=0.3, and others by default. I'll try to play with them next time. Also gpu was set on use Priority, so maybe it wasn't going for its max ...

Go and get your cup of coffee now.

Made using Cinema 4D, Turbulence FD for smoke (separate pass), Photoshop for texturing and compositing (no color correction was done on the main image at all), UVLayout for bean texturing process.
GTX 760 - 2 hours 30 minutes. Pathtracing still leaves a little ...