V-Ray, long time drafts renderings

[rubensabou]

I'm quite new with v-ray so I want to know which are the best settings for drafts render? My last draft render took 30 minutes, 640x480px. I'm using a HDRI map in a V-ray Dome light. I have to mention that i have a lot of glass, but the model is quite simple. I tried to get the settings as low as possible. I attached my v-ray settings.

 

My specs:

i7 - 2.7GHz, 2 cores, 4 threads.

Video - 2GB.

RAM - 8GB DDR.

 

Edited July 3, 2014 by rubensabou

[Zdravko Barisic]

Some weird glass subdivids? Like 128?

Do you have some displacement in scene?

...

Maybe its just due to HDRI, it takes a lot of ram, and you are only on 8GB, so its swaping, maybe.

[RyderSK]

Well, glass isn't quick, and you have unfortunately quite weak cpu, it's laptop right ?

Tick sub-pixel ON, it will save you time with lot of reflective surfaces. Also Clamp (either to 1 if you won't be doing drastic post, or 3-4 if you plan), it help you do less AA calculations on edges.

You can alternatively try limiting reflection/refraction bouncing just enough to avoid artefacts, so like 4 for glass, and maybe 2-3 for glossy mats.

 

I would advice to bring the AA min/max back to reasonable ratio of 1/8.

[rubensabou]

Some weird glass subdivids? Like 128?

Do you have some displacement in scene?

...

Maybe its just due to HDRI, it takes a lot of ram, and you are only on 8GB, so its swaping, maybe.

 

Subdivs for all glass materials are 8 and 4. No displacement.

For HDRI i used a VizPark HDRI Skydome, so it's big, 200-250 mb.

[Chris MacDonald]

Those settings are not a million miles away from my draft settings (in fact, mine are slightly higher quality in places), and I'd imagine a scene like that to have rendered in about a minute or two. I'm with Juraj on this, the processor isn't very quick.