Render advice !

[sherifelshorbagy]

Hi all,

I am working on an interior project of a bedroom. Is it normal that rendering takes days to get done ?!! my machine is:

AMD A8 3.2 GHz 8 GB RAM win 64

and my render settings:

Resolution 2000x1126

adaptiv sampler min1 max8

noise threshold 0.001

Amb. occlusion subdivs. 42

Irradiance map min rate-6 max rate-1 subdivs 70

light cache subdivs 1000 nad size 0.002

All lights subdivs 400

all materials reflection/refraction subdivs 100

thanks in advance

[Scott Schroeder]

Your settings are completely out of whack. 400 light subdivs? 42 AO subdivs? 100 material subdivs? Where did you get these numbers?

 

Start here: http://docs.chaosgroup.com/display/VRAY3MAX/Universal+V-Ray+Settings

 

Though note that the 1/100 is really overkill. You can get by with 1/24 and a color threshold of .01. You'll have some noise, but unless you are super picky about that, you can gain speed at the cost of very slight noise. Noise that can be easily cleaned up in seconds in Photoshop using the de-noise tools in camera raw.

 

More good stuff:

http://www.peterguthrie.net/blog/2014/7/hdr-sky-lighting-for-interiors

http://www.peterguthrie.net/blog/2014/3/not-quite-so-universal-settings

[sherifelshorbagy]

Thank you again sir Scott, I tried each number on its own to identify its effect and completely clear away all the noise. When I reduce any of these numbers I start to get noise that cannot be ignored!.. but I will check the links you kindly provided and see how things will go !

[sherifelshorbagy]

I checked the links and kept tweaking things until render time is ok, but noise is very visible even when reduced in photoshop !

Edited January 11, 2016 by sherifelshorbagy

[Francisco Penaloza]

Noise in V-Ray depend of a few factors, with the latest release Chaos group tried to simplify the whole setup process but in certain scenes some manual work may be need it.

What type of scene are you working on? is there many glossy objects, or frosted glass?

What type of illumination are you using? do you have active DOF in your camera?

[ignaciofernandez]

Maybe you can share the image you are working on, so we can take a look at what is most likely happening. As Scott pointed out, those settings are just beyond reason.

 

Another question on the list: which V-Ray version are you using?

[sherifelshorbagy]

Here is the noise in my scene I am talking about. A little in the shadows, a little in the reflection glossiness. DOF is not activated. I use vray plane lights, and vray sun. I use vray 3.008.

Edited January 12, 2016 by sherifelshorbagy

[TomasEsperanza]

They don't look particularly noisy to me. I wonder he was expecting too high a quality from too small an image size. How big was the image? Perhaps it just needed to be larger?

[michaelgolden]

seconding scott schroeder and thomas hope's comments. there is no circumstance to ever use the settings that you are using. it really just looks like you are rendering things at too low of a resolution, and the noise that you are bothered by is just a matter of the fact that the image isnt high enough resolution. id go back to default settings, double or more your resolution, and set noise threshold between .005 and .01 and see what happens. i suspect the main culprit of your render times is the .001 noise threshold. as far as ive ever been able to tell, below .005 is never noticeable visually, but will multiply render times over and over. your settings look like you are just upping settings for the sake of upping settings in hopes that something will work. go back to default settings, enable some render elements, and figure out what is creating noise, and tackle things that way. i really think, based off your attachments, that your problem is resolution, not render quality.

[sherifelshorbagy]

Thank you sir Thomas hope, and sir Michael Golden for your response. My final render is at full HD resolution, and I still can see this sort of noise. When I use default settings I get a very noisy image. What I do is checking the effect of the GI only turning all direct lights off, and use a gray override material; and keep tweaking the GI until I get a smooth result. Then I turn all the lights on, and keep tweaking them until I get smooth result. Finally tweaking the materials subdivs. This is the workflow I use. Is this right to do this ?

Edited May 12, 2016 by sherifelshorbagy

[Chris MacDonald]

I'm not seeing any noise. You're going mental.

[John Dollus]

I think you need to adjust your expectations more than your render settings