LONG Render Time - 30+ Hours - Single Frame/Image

[tasi55]

Hi Guys,

Doing a render for portfolio, all is done, just need to know if this is normal. Im in the process of renderinf my first 'Final-High Settings' image out of Vray.

Here are the settings:

Output Resolution: 1920 x 850

Adaptive DMC
Vray Lanczos Filter
Min SubDivs: 2
Max SubDivs: 20
Clr Thresh: 0.001

Primary: Brute Force @ 16 Subdivisions

Secondary: Lightcache @ 1600 Subdivisions w/ Glossy Rays checked

Its and interior shot of an open space with glass and glossy wood but is it normal to see a render like this take up to 30 Hours to render?????

I have an I7 system with 12Gigs Ram. Its rendering as I write this, but the estimated time is climbing close to 40 hours. PLEASE HELP!!!!

[jucaro]

It should climb. What you are doing is trying to sharpen a noisy sampling(brute force) with a clr threshold of .001(to eliminate the noise) with a 2x20 image filter to smoothen it. .001 is very steep
Try 4x16 min max and .01 clrthresh.

If you can, post the rest of the parameters, and a sample of the render.

[WAcky]

Just out of interest, why the BF and LC combination?

[tasi55]

Originally Posted by WAcky

Just out of interest, why the BF and LC combination?

From reading tutorials and so forth, says that Brute Force is more accurate especially when you have blurry, glossy aspects which I have a lot of. But I must say I have tried the Irradiance Map + Lightcache combo and I can deal with the slight noise in the blurry reflections. Got it down to 9 Hours for a 1900 x 850 render. I think the reason why it could be taking so long is because its an interior night shot with heaps of IES lights.

[tasi55]

Originally Posted by jucaro

It should climb. What you are doing is trying to sharpen a noisy sampling(brute force) with a clr threshold of .001(to eliminate the noise) with a 2x20 image filter to smoothen it. .001 is very steep
Try 4x16 min max and .01 clrthresh.

If you can, post the rest of the parameters, and a sample of the render.

Cool, but do you think its normal for it to be taking 25+ hours for a 2000 x 900 image to render out. My machine aint slow, hard for me to know because this is my first proper Vray render. Thanks for the advice though, will give it a try.

[rmccoy]

I would switch from brute force to irradiance map

[STRAT]

your problem is lack of experience with vray. those AA settings are too funny

IRR+LC (or BF even) will give you exactly what you want in a fraction of the time. just have a play and experiment. dont just throw it into high settings mode and hit render else you'll suffer and end up in here looking for a way out.

[ihabkal]

I would steer away from using Brute Force for primary.

[ilovegooddesign]

I would steer away from using Brute Force for primary.

very good advice. Brute Force is realy more accurate, but you can use high settings for IR map and Image Sampling, so nobody see the difference.