How to improve render times

[TeoRossi93]

Hey guys!
I'm working on a simple animation but render times are going to be huge, each frame is taking about 10 minutes on my workstation (i9 13900k).
As you can see the scene is simple, just a spray bottle, few lights and dark background.
The render is slow because of the liquid inside that is made with volume.
Any tips on how to optimize settings to speed up the render?

Cheers guys

[Beanzvision]

At a guess, I would say that the volumetrics of the plastics is causing this. You could try to increase the directionality.
https://support.chaos.com/hc/en-us/articles/4528339318289

[TeoRossi93]

At a guess, I would say that the volumetrics of the plastics is causing this. You could try to increase the directionality.
https://support.chaos.com/hc/en-us/articles/4528339318289

Yes sure, volumetrics is 100% the issue here, can't turn it off because the real product is like this.
Increasing directionality would modify the look of the liquid I guess

[Beanzvision]

There's only one way to find out ;)

[Beanzvision]

Another thing you can try is to disable ''Single bounce only''. There are some trade offs for this which are mentioned in the article above. I hope this helps.

[TeoRossi93]

Another thing you can try is to disable ''Single bounce only''. There are some trade offs for this which are mentioned in the article above. I hope this helps.

Alright, I will test some frames without the single bounce.
In the meanwhile I started rendering with a cropped frame, activating c4d render region and excluding all the black areas on the sides. This simple thing kills render times, each frame now takes less than 5 mins to render.
Pretty weird considering that the black area around the spray is just blank, nothing happening there.

[Beanzvision]

Maybe the ''Render selected'' option might be useful to you? Add what you want rendered and you'll get just that. ;)

[TeoRossi93]

Maybe the ''Render selected'' option might be useful to you? Add what you want rendered and you'll get just that. ;)

I use render select often, it does kill the render times but not that much. Render region works way better :)