Want to find what's causing prepass when rednering

V-Ray V-Ray for 3ds Max General
1

I have a scene with no interpolation on my reflection/refractions. GI is turned off.

I am getting a pre-pass at the beginning of each rendering and I can’t figure out why. There are Vray2Sided materials in the scene -- will do they cause a prepass?

2

fast sss2?

3

I don’t think I have SSS2 in this scene. There are so many materials though and maybe I missed something. Is there a fast way to find out?

Update: I tried to render with the automatic override material set to a Standard material. I still get a slow pre-pass phase.

If I turn off reflections/refractions in Vray global settings, it will get rid of the pre-pass. But I don’t understand how I can have any reflection/refractions if the Override material is set to standard.

This is very confusing.

4

I think it was just interpolation after all -- buried in one of dozens of multimats that was difficult to find. Although I’m curious why the override material wouldn’t have voided that out.

5

for future perhaps use Olly’s VMC script. You can get rid of interpolated (and most) other settings in a couple of seconds, even in complex scenes. It has saved me headaches in similar scenarios…

6

Definitely have to second that ^

It’s a brilliant script.

7

That’s very interesting - we could investigate what is the exact reason for the mystery prepass if you are able to share the scene with us.

8

VMC is a great script, that’s true!
And combined with Zorb Modifier script, together they will let you manage everything in 3 clicks.