VRay Blend material for dispersion and VRay-RT. 16 GB memory usage!

[cecofuli]

Hi Vlado,

I've a problem. I've a simpli scene. A diamond with a ring.
I'm try to use VRay-RT. If I use a simply glass VRay material all work fine. If I try to use this shader (blend shader for dispersion), vray.exe (in the task manager) use a bout 14 GB of memory and Windows freezes (or crash). It's a bug?

SHADER

[vlado]

What is your trace depth set to in the V-Ray RT settings?

Best regards,
Vlado

[cecofuli]

Hi Vlado,

It's 30. And yes,see next:

trace 5 = 1.65 GB
trace 6 = 2.37 GB
trace 7 = 4.22 GB
trace 9 = 9.6 GB
trace 15 = freeze > 16GB

and more trace, less interactivity and speed in the RT viewport update.

But 10 it's very low setting. Usually, in VRay 1.5 we use somethink like 20-30.
So, 5 it's the correct value? With Bland shader we can't use 10 or 20. It's correct?

[vlado]

It is only a problem for the fake dispersion shader, because the rays are split into 3 parts each time, leading to an explosion of rays... this is not a particular problem for the regular V-Ray, but it is an issue for V-Ray RT currently.

Best regards,
Vlado

[cecofuli]

Ah, ok. Just for test, trace = 5 in VRay-RT is perfect . Anyway, the dispersion fake shader... wow, it's very slow... And I think because the rays are split into 3 parts each time, as you write.