How to reduce a Liquigen sim rendering times.

[Jukyan]

Hi there,

I have to render a quite big water simulation done in Liquigen.
The built-in Liquigen render engine would be good enough for what I need but I need to render with a spherical camera, so I would render it in C4D+octane.

Problem is... switching to octane takes more than... 2min per frame ! (resolution is 6800x3540)
Liquigen renders in less than 2seconds per frame !
I am wondering why there is such gap between Liquigen & Octane. I just need a simple water shader with a reflection/refraction, no GI or HDRI required.

Does anyone have tips on how to simplify the rendering to the lowest possible rendertimes ?
Or how to render in another app or render engine entirely, who would use GPU rendering & spherical cameras, matching the look below.

Also another problem is : the first frame renders normally, then the rendering time increases significantly over the following frames...
Seriously... WTF ?!

I won't consider online rendering because the sim file would take a whole day to upload with my bandwidth...



Thanks in advance !

[bepeg4d]

Hi,

please share a screenshot of Kernel Settings panel.

Maybe you can speed up a little the render time per frame, but I suppose that a 240GB liquid sim at almost 8k resolution cannot be fast to be calculated, and you need a lot of GPU power.

ciao,
Beppe

[Jukyan]

Too bad there isn't a "biased speed rendering" option for octane :p

In this case it doesn't make sense to render with an unbiased engine but thats all I got... :/

Here are my settings :

[bepeg4d]

Ok, you cannot increase the rendering speed to much, but try these settings:

- Path termination power = 1
- Parallel samples = 32
- Max Tiles = 64
- Noise threshold = 0.05
- Expected exposure = copy-paste the Exposure value from Camera Imager node
- Group pixels = none

ciao,
Beppe

[Jukyan]

Thanks Beppe !
These few % difference will help & save a couple hours

[bepeg4d]

Great!

Happy GPU rendering!

ciao,
Beppe