Extremem Noise in VRay Lights

[Guest dialog]

Ok, so I have an interior night scene (I have a bunch of day scenes with the same model that are lighting just fine).

 

I have a mix of VRay Plane, sphere and IES lights. The IES lights on their own render fine with no noise. The Dome light HDRI I am using renders fine with no noise. I have narrowed the issue to all the other lights. When any of them are enabled I am getting really bad noise. I have never seen this problem working in vray to this degree. I am on the VRay Beta 3.4 release. I dont think its my global settings, yet I have tried increasing sample on each light to see if that helps (Which is what I did for the interior day scenes and corrected my problems)

 

Typically I dont need to go as high as I have in light cache Subdivs, IM Interp. Samples, or even the individual light subdivs....

 

Im at a loss for what could be causing this.

Edited January 24, 2014 by dialog

[himanshuchoudhary]

Is there any object with vraylight material applied to it in the scene? I faced a similar issue a couple of days ago, and had to just change this vraylightmaterial to vray mesh light.

[Guest dialog]

There are a few yes...but right now I am have an override material on it to eliminate any material issues. I have found that each light when rendered separate is fine and I can adjust samples per light to get rid of noise. As soon as I start combining any lights that (except the IES and Dome) I start getting the noise.

[himanshuchoudhary]

For some reason, the override material did not change anything regarding the noise with vraylight materials. I also think your lights might be tooo strong.. you might want to try working with the camera exposure? Just a suggestion.. not sure if it might help.. What are your vray dmc sampler settings by the way? Increasing material reflective subdivs helps too in few cases.

[himanshuchoudhary]

When dealing with noise, rather than just jack up your imap resolutions, check your Hsph and Interp samples.

 

You generally want to be around 20-50 Hsph and 20-100 Interp samples. Start with 20 Hsph, and gradually increase your interp samples until you reach 100. If you still see noise, set your Hsph to 30 and gradually increase your interp again. There is no secret sauce for this as we all have different needs and different visible noise thresholds for our renders.

 

From another post...

[Guest dialog]

I will try this...although Its not making sense why the lighting is doing what it is doing. the 2 IES and Dome all work fine together. Once I turn on any other light all hell breaks loose... although when that 4th light is rendered all alone its fine.

[Guest dialog]

From another post...

 

This didnt work. I am beginning to question whether or not this is a big in the Beta version. All my other files are fine

[heni30]

Can you post the image showing the noise problem?

[Guest dialog]

Can you post the image showing the noise problem?

 

Here is the ray light pass

[RyderSK]

Here is the ray light pass

 

I see foremost IR problems. Big ugly IR splotches everywhere. Hsph subdivs should be the first value to tweak higher.

 

Did you try Scott's advice properly ?

 

Anyway, I am fan of different approach to IR. I never lift Interpolation samples higher than 30 because the blurriness is already out of hand and DetailEnhancement becomes a must. I see no problem lifting HSPH to 100 and higher once "GI unfriendly" (as I call them..) lights get introduced (light materials,emmissives, IES,etc...) into complex scene setup.

 

It's definitely not a bug of Vray (even if it's beta 3.xx) so why are you using "expert" mode again ? 3.xx has a preset slider with interiors, try using that first.

 

Other things to do:

 

Since IR subdivs is also governed by DMC sampler, you can lower the adaptive to 0.6 for example instead of default 0.85.

You can also try raising minimal samples to 128-256.

 

And last, tick "time indenpedant".

 

One more general tip I noticed from your picture: When you use "Override", hide glass in windows.

Edited January 24, 2014 by RyderSK

[Guest dialog]

I see foremost IR problems. Big ugly IR splotches everywhere. Hsph subdivs should be the first value to tweak higher.

 

Did you try Scott's advice properly ?

 

Anyway, I am fan of different approach to IR. I never lift Interpolation samples higher than 30 because the blurriness is already out of hand and DetailEnhancement becomes a must. I see no problem lifting HSPH to 100 and higher once "GI unfriendly" (as I call them..) lights get introduced (light materials,emmissives, IES,etc...) into complex scene setup.

 

It's definitely not a bug of Vray (even if it's beta 3.xx) so why are you using "expert" mode again ? 3.xx has a preset slider with interiors, try using that first.

 

Other things to do:

 

Since IR subdivs is also governed by DMC sampler, you can lower the adaptive to 0.6 for example instead of default 0.85.

You can also try raising minimal samples to 128-256.

 

And last, tick "time indenpedant".

 

One more general tip I noticed from your picture: When you use "Override", hide glass in windows.

 

I changed for the 4K render some of the lights in the scene and made them bigger and more powerful. Not sure if some of the small odd lights I had may have contributed to this.

 

I used 60/30 (if I need to bump to 100 instead of 60 I will know on Monday)for the IR and changed the DMC to 0.75 and 0.001. Samples I left at 8 for now...I will see how they look Monday.

 

I have 2 passes for the override..one with the glass and one without...I just wanted to see how the interiors alone were contributing to my scene.

 

I always open Expert mode to see whats going on..I think its more my OCD than anything haha.

 

What is the "Time Independent" checkbox for? Never have used that one.

 

 

Thanks for the help everyone!!

[notamondayfan]

Time Independent is for animations, and how the noise is produced from frame to frame, nothing to do with the amount of noise.

 

Can you post a screen grab of your viewport, showing the position of the lights? One thing to really check is that the vray lights aren't intersecting anything, even other lights, as this will throw a lot of noise into the scene (it does on Vray 2.4 anyway). No matter how high your subdivs are, if one light is intersecting, you'll always have more noise.

 

Dean

[Guest dialog]

Time Independent is for animations, and how the noise is produced from frame to frame, nothing to do with the amount of noise.

 

Can you post a screen grab of your viewport, showing the position of the lights? One thing to really check is that the vray lights aren't intersecting anything, even other lights, as this will throw a lot of noise into the scene (it does on Vray 2.4 anyway). No matter how high your subdivs are, if one light is intersecting, you'll always have more noise.

 

Dean

 

 

I ended up re-lighting the scene and got rid of my smaller lights that were of very small proportions and high intensities and weird shapes. Seemed to fix the major issue of noise. I wonder if one of my lights might have been intersecting from before. Either way, with the new light set up and taking advice from some of the higher settings in here...the noise was pretty much eliminated, or at least to a manageable level.

[Guest dialog]

I ended up re-lighting the scene and got rid of my smaller lights that were of very small proportions and high intensities and weird shapes. Seemed to fix the major issue of noise. I wonder if one of my lights might have been intersecting from before. Either way, with the new light set up and taking advice from some of the higher settings in here...the noise was pretty much eliminated, or at least to a manageable level.

 

Here is the beauty pass...no noise