Vray Proxy from Frost, crazy render times with Refractions

[fkfx]

Hi,

in my scene, there is a water surface, created using Thinkbox Frost. I have applied a VRay material with settings for water and with Frost it renders about 15mins per frame.

As we have this mesh in several scenes and passes, I wanted to cache this mesh as Vray Proxy, so Frost won't calculate a new mesh for every frame in each pass over and over again. So I created a vray mesh from the animation, which takes ages but works.

I loaded this vray mesh as Vray Proxy back into my scene and everything is working fine as long as I don't use any refraction with my material. If I do so, the rendering times per frame (from 15mins with Frost object) go up to 2 hours.

So I am wondering what's going on there. If anyone could point me into the right direction, this was great!

[super gnu]

could this be related to the multithreading issue some other people have mentioned with proxies? do you have a machine with a load of cores?

[fkfx]

Yup, 24 Cores (2*12 using a X5690 dual CPU machine). But why's that only in the refraction, then?

[super gnu]

no idea.. just remember somebody else complaining about slow rendering in a scenario like this.. i could dig out the thread , but i remember one hack/;workaround was to render 2 frames simultaneously on the machine using half the cores for each...

having said that maybe see if anyone else can shed more light..

[vlado]

You can email to vlado@chaosgroup.com for a build that hopefully works better.

Best regards,
Vlado

[fkfx]

Thank you very much, Vlado. I sent you an email but your autoresponder told me you were out of office until next week.