rendering optimization for foam?

[hammerbchen]

Hi,

(Not sure where should I post this topic)
I am rendering this lighthouse scene with lots of foam, but rendering time a bit too long (1024X768 resolution, 5~8hrs per frame). My specs: HP ZBook 15u G2 laptop, Intel Core i7-5500U 2.4GHz, 16GB DDR 3L.

My goal is to render a still image, reduce the grainy-look for the foam, make it as silky as possible. Here is my reference image and two of my rendering images.






What I have tried:
- reduce Foam rate to 1.0, Pattern Stregnth = 5
- Point mode for PHXFoam001 instead of bubbles
- turn off GI, only use dome light as fill light
- uncheck image filter
- Image sampler/adpative, min shading rate = 2, Min Subdi =1 Max Subdi = 3
- Reflec/Refrac Overide depth = 2
- turn on motion blur

It would be glad, if I can get some help, tips or hints on this.


Chen

[Ivaylo Katev]

you can try to render separately the foam, foam + water requires much more time than only foam and only water. to not lose the water tint effect, you can use the tint option of the foam shader, it introduces the tint without geometry presence in the rendering

[Svetlin.Nikolov]

Hey - first things that come to mind:
- grab a latest nightly - PHXFoam in point mode should render about 30-40% faster these last couple of days.
- Render foam separately from the liquid surface in separate passes - you can use two PHXFoam shaders with differing subgroups - one for the foam above water and one below the surface. This should improve the render speed dramatically, but you have to comp it later.

Cheers!

EDIT: Re-posted with Ivaylo, but still - check the latest nightly.

[hammerbchen]

thank you all.

much faster now!

[Paul Oblomov]

You can try exporting this to abc and load with vray and render in point mode with vray point shader applied. Much faster, than phx.

[hammerbchen]

You can try exporting this to abc and load with vray and render in point mode with vray point shader applied. Much faster, than phx.

thank you, will try that also