[Sidefx-houdini-list] Mixing sss and refraction. Ouch.

Peter Bowmar pbowmar at gmail.com
Tue Aug 9 13:44:49 EDT 2011

Hi Christopher,

Actually, it should be fine but there is a trick!

For reasons best answered by SESI, they leave turned off and unexposed
a critical parameter for SSS.

In the SHOP that has the SSS, try this:

Dive inside, find the Surface Model VOP. RMB on it's icon and select
Allow Editing of Contents.
Dive inside the Surface Model, find the "if2" VOP that's inside the
grey SSS network box. Dive inside.
On the Physical SSS node, turn on Optimize Secondary Rays for both
Single and Multi scattering.

Now try rendering, you may find it finishes :)


Peter B

On 9 August 2011 10:07, Christopher Stewart <stonesoupdigital at gmail.com> wrote:
> Well, that'll learn me.
> In a rush to get a bit of my "learning Houdini" project out for
> SIGGRAPH,  I plugged in everything and just hit "go". Assuming that,
> if I waited long enough, brute CPU power would get me the frames I
> needed. Alas, it was not to be so.
> http://www.vimeo.com/27492063
> When the pasta hits the water, all progress ceases. Electrons stopped
> spinning, the birds hang motionless in mid-air. Well, the render
> didn't go any further anyway.
> I could still get a preview render to kick out a visual, but any sort
> of final just never stopped rendering. Turning off SSS cleared up the
> issue.
> Any suggestions to get around this? I'll be involving the pasta with
> more refractive fluids later in the sequence. I was also considering
> making the pot glass and taking a stab at pasta swirling in the
> boiling water...
> Thanks!
> Christopher
> ps. cv/reel at stonesoupdigital.com. I'm on the lookout for an entry
> level Houdini position!
> --
> ----
> Christopher Stewart
> Vancouver, BC
> 3D | VFX | IT
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Peter B

--No, I am not on Facebook.

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