Question: Why does Vray do a double pass?

[Dmerc]

Some explanation would be highly appreciated: I am trying to get out a bunch of quick previews. Vray is rendering in 2 passes - even in progressive mode with BR/BR. What is the first pass for? Is there a way to turn it off?

Thanks in advance!

[hermit.crab]

Maybe Photon Map Caustics are active?

[Dmerc]

Just checked - good idea, but no. It seems to only happen in GPU-Mode.

Basically it looks like it's going to render but then starts over after a few passes.

[Buck]

that might have to do with the embeded passes, the embeded passes don't show up as quickly as the RGB pass does. Just a guess.

[hermit.crab]

Is there anything in the log that might indicate the nature of the pass?

[kosso_olli]

Maybe the ancient reflection glossiness interpolation imported from a very old material?

[M.Max]

I think you are talking about the first 32 passes that vray do in order to perpare the adaprive lighting iirc . after that vray will start again from 0 but usually the render is faster now .

[Dmerc]

Thanks for the answers. M.Max I think that must be it, because I did not have any other prepasses. Good to know! Thanks!

[^Lele^]

Indeed, it's the preparation of adaptive lights, the log will say so as the render progresses.

[Dmerc]

A very belated thanks, Lele! I never came around to appreciate your effort. But the question just popped up again . Have a good weekend!