Render settings - glass, water, volumetrics [redshift]

[art3mis]

Created kind of a render torture test. All that is missing is caustics!

Would appreciate some expert RS feedback on some starting settings to try for a quality render. Assume I will be enabling motion blur on the water droplets as well.

In this simple scene are there any advantages to setting samples at the Material level (water, glass)?

Using 2 Dome Lights, a Volumetric Spot and slight accent with backlight area.

glass_water_volumetric.mp4

Edited December 16, 2019 by art3mis

[flcc]

In this kind of scene just use global settings. No need to go too high.
4 64 or 128 could be ok.
As the scene is dark, set adaptative error threshold to 0.005.
Eventually if the Volumetric spot is two noisy, cranck up the volume sample in the light. 512 or 1024.
For caustics I never use it. But take a look at the doc here. It's very well explain.

by the way your sample movie is a bit small to be able to see nois artifacts and/or give advice.

[art3mis]

Thanks. Will try and post a higher res frame once I am closer to completion. So I assume no need for GI?

[flcc]

Your scene is just matter of reflexion and refraction. So GI don't really help here.
For caustics I'm not sure, but it seems to me that it is.

[art3mis]

OP

Edited post to include 2 images.

 

Getting a lot of noise and fireflies in the reflections.

Again 2 dome lights

1 volumetric spot with 1024 samples ray contribution

Uniform Settings

16 min

512 max

Adaptive error .01

Sample Filtering Gaussian

2,4,4

 

GI disabled.

[flcc]

 

With 16-512 samples, getting so much noise, It means that there is something wrong.
It seem the noise come from volume.

 

25 minutes ago, art3mis said:

1 volumetric spot with 1024 samples ray contribution

Is this sample setting is the one in the volume tab of the light (not the main one) ?

Fireflies is the worst problem. Very difficult to get rid with just render settings.
Better to find what trigger them.

If you can "frozen" one frame, I cant take a look.

Edited December 16, 2019 by flcc

[art3mis]

Yes the Volume Tab. AFAIK for a Spot light its the only place you can enter Samples.