Noisy Vray Renders

[ryanmcauley]

Hey Architects.

 

I recently upgraded to VRAY at work and have been loving the textures and renders however i noticed that lately when using metallic materials i am getting a lot of noise on them. I was wondering if you guys could give me some tips and tricks for making them crisp and photo-real. I have attached a render for your viewing pleasure to illustrate my issue.

 

 

also i was wondering if you guys could share some of your finished render setups for doing max quality renders. i have been using 50+ subdiv on lights and my light cache is at 2000 but my renders are still going fast, ~2min a piece and i am concerned that i am not getting the potential from this program considering i hear people having high quality take 20min -1hour.

 

My specs are:

- 64 bit Windows 7

- 12gb ram

- nvidia Quadro FX 5800 graphics card

- Intel Xeon x5690 3.7GHz 12core processor

 

not sure if any of this is what you guys need but trying to give as much info as possible. as i said, i am new to vray so im sure any and all help will be appriciated!

 

Thanks,

Ryan

[ryannelson]

I highly suggest looking at some beginner tutorials to learn the theory of how Vray works. 50+ shadow subdivs is not high, light cache at 2000 is average range for high quality. I'm surprised you're getting 2min per render with your (assumed default???) AA settings though, the default settings are so horribly not optimized. 20 min renders are test quality...

 

We need to know ALL your settings: vray settings, lights, and materials in order to help. We can make suggestions with vague information based on visuals, but it helps to have the breakdown. That being said, the biggest help is for you to do some legwork of your own in an attempt to learn how the program functions. This may sound blunt, but the fact of the matter is that you can most often help yourself if you have an idea of what is going on and what is contributing to each component of the render.

 

If you are seeking increase in quality, the computer specs affect the render in no significant way (unless you're crashing due to lack of ram or something). Faster machines affect the speed, not quality.

 

Your AA sample rate is probably too low for your min/max subdivs. Are you using HDRI to light, or what are you lighting with? Your material subdivs are probably default at 8 in the reflections? These are pretty basic things to make a crisp image... but there's not universal settings you can apply to make it look good. Each scene is different and its important to understand how to apply the theory. The answers are at your fingertips.

[Nic H]

is that burger really big

[ryannelson]

is that burger really big

 

It's actually a chair.

[Nic H]

its a good chair IMO

buy on sight. can you get them from design connected ?

[TomasEsperanza]

Here are some quick pointers / things to try: in vray material settings, turn on fresnel for all materials. Use "Ward" for metals. Use a blurry hdri lightdome, and a v-ray sun, as well as your interior lighting. Add reflectivity to everything and moderate it by making it blurrier. The blurrier you reflection glossiness is the more samples that material needs, so feel free to bump up the materials reflection glossiness samples to 32,64, or 128. Consider the roughness values in the shader too: perhaps 0.1 for plastic, or 0.8 for bread, etc. Set up two render presets, one for fast tests another for highquality. The irradience map setting can be on very low with 50&20 subdivs for tests, then for quality render set preset only to medium but go higher with subdivs, 150&50. Lightcache could be as low as 128 for fast and more like 2 or 3k for quality. Tick Use lightcache for glossy rays. Use region render at a higher quality to work on a rendering artifact. Set up vray render passes, just select them all if not sure, and view these inthe frame buffer dropdown to see which componants of your render are contributing noise etc. In short don't rely on AA for cleaning everything. I often stick to Area 1.5, it is fine. I set Adaptive DMC multiplier max to about 3 for tests, and 16 for final. Use the Clr thresh: 0.05 for fast, 0.015 for quality. Keep the noise threshold very low (eg 0.002). Adaptive amount can go higher, say 0.98. Often noise is from lights not materials, you can see in passes, so bump up the lighting subdivs if nes, don't be afraid to go high. Add subtle quad chamfers and noise modifers to geometry. Use DR if machines are available, then you can up settings, and still get quick feedback. These are just off the cuff throwaway tips but, ive been useing vray for a couple of years now. Hope it helps, sorry if you know a lot of it.

 

Nice Burger, I know what I'm havin for lunch :-)

 

 

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Edited February 21, 2015 by TomasEsperanza

[ryanmcauley]

Thanks everyone for your help! I will be sure to try out all your suggestions when i get the chance.