noise in vray 3.40.01

[liorsturlesi]

Hi,

While rendering an interior scene( with vray 3.40.01) i can't get rid of the noise coming from glossy reflection on the ceiling mat. of the room.

Even if noise is reduced to 0.001 and the max sub in dmc to 50 (mat. lights. sub is in on the locked mode as vray 3.40.01 default)

How can i remove this noise without losing details using the denoiser pass ?

 

thanks in advance,

Lior.

[Francisco Penaloza]

The simple way is just increasing your samples.

Create a sample rate pass and do a region rendering of the affected area, do a quick render, if you have noise and the sample rate is red, then you need more samples.

If you have noise and your sample rate is blue, then you need to reduce your noise level.

From your post your noise level is very low already, so increase your sample number and go from there.

Other things to consider.

Check the amount of lights in your scene, if your amount of lights is bigger than 16, you need to increase that number in the probabilistic light option. Put the same number of lights in your scene.

Depending how you lit your scene, if you are using VRay Sun/Sky, try to hide the VRay sun, do not put it behind a tree just chick the hide option.

If you are using an HDRI, you may need to increase the resolution value or reduce the burn intensity(inverse gamma), this sometimes create over bright pixels that are hard to clean.

You could use reinhard and the clamp option to reduce this over bright area, this way the Antialising will work better, but you also lose lighting information for post processing. For some people this is a problem for other it is not, is your call.

Let us know if this works.

[Bruce Hart]

I would suggest turning the Probabilistic Lights option off completely and see if that helps. It can introduce a lot of noise in interior scenes in more recent Vray versions. I think Chaos are addressing these issues in Vray 3.5

[liorsturlesi]

Thank you for your help

I have tried increasing the probabilistic light to the lights number value - around 30. It did had some minor influence but not major one. Disabling didn't help either

Only by reducing noise thresh. to 0.001 noise is cleaned from the image (mainly appearing on places like ceiling which direct light can't reach to) but obviously rendering becomes very slow.

In the earlier vray i could overcome noise coming from the portal lights by significantly increasing the sub of that portal plane of reflection sub. from the materials.

I can see that the sub of the light aren't locked, but i can't see the influence by raising there values from the other hand. Obviously glossy reflection materials are in locked mode.

I'm using HDRI only for the reflection Map slot and vray sun& sky (0.2 intes.) - Attached a screen shot.

[Francisco Penaloza]

Did you use the sample rate pass to find out where is the noise coming from??

You can disable the universal settings and go samples per element basis if you feel more comfortable that way.

If the ceiling is the only one still having noise, then you can do right click and go in to VRay properties and increase the sample rate for that object only.

Remember you have one universal control on the render panel, default is 6, for interiors I usually increase this to 10 or more depending.

Then if there is only one object messing things up, you can increase the subdivs only for that object.

Need less to say general subdivs and antialising should be some what related, for example, do not increase subdivs to 30 and leave AA samples to 6. For me the best combo for quality and speed is when both numbers and similar. 30-30 or 25-28.

Per object bases you can go further but if the number is too exaggerated, then there is something else wrong.

[SkylineArch]

what types of lights are in your scene? If you are using an emissive material it can create a lot of noise that is difficult to get rid of.