Too much noise?

[Dink]

I am rendering my last creation with VRAY for Rhino 4.

It seems ok but there is too much noise...how i can reduce it?

Thanks very much

ps: any other soggestion for make it better in general?

[dalomar_cg]

Re: Too much noise?

Lower the Noise Threshold. By Default its at .01, which is fine for preview/medium quality, but not so good for finals. Kick it down to .005 and see if that works for you. If not try lower and lower (by .001 increments) until you reach .001. Beyond that your looking at crazy render times, and with that scene I'm pretty sure .005 should take care of it for you.

Also, check your AA settings. Sometimes increasing the AA settings can help smooth out the noise as well.

[Dink]

Re: Too much noise?

I set .005 i think it's quite good, but the white material is already noise..mmm maybe it's the material? mmm what setting i must decrease/increase of material?

[dalomar_cg]

Re: Too much noise?

If there are reflection/highlight glossies on it, then you can increase the subdivisions of the material from 8 (the default) to maybe 12 or a little bit more. If you don't have glossies on it then the only thing that you can really do is decrease the noise threshold even more (to .0025 lets say). I actually think that you may be able to smooth that out by adjusting your Anti-Aliasing (Image Sampling) settings. If you could post those, that would be helpful in telling whether that would help or not. If your using QMC for primary bounces, then I really suggest using Adaptive QMC for AA. I think a good final quality AQMC setting is from about 1 to 24 and up. If you've got it at something like 1 to 8 or 12, then you can definitely smooth that out with AA settings

[Dink]

Re: Too much noise?

These are my settings

[dalomar_cg]

Re: Too much noise?

I would move from Adaptive Subdivision to Adaptive QMC...I typically like Adaptive Subdivison, but when I use QMC for primary bounces I've found that using Adaptive QMC works better. As I said I would recommend 1 to 24 as a good starting quality setting. It will be slower than adaptive subdivision, but not as slow as lowering the Noise Threshold to get rid of the remaining noise.

[Micha_cg]

Re: Too much noise?

I recommend this setup, good for most cases most:

Image sampler
adative QMC 1/4
aliasing filter area 1.1

QMC sampler
amount 0.85 + noise 0.01

Indirect Illumination
primary GI: IM
sec GI: LC + multiplier 0.8

Light cache: 1000 subdivs + size 0.01 + use for glossy rays
Irradiance map: max rate -1 (for small details 0) + no multipass + subdivs 66 + samples 20


Set all rect lights subdivs at 16 and use for glossy reflections/refractions material subdivs:
0.9 -> ~22
0.8 -> ~33
0.7 -> ~44
.
.
.

So my general basic setup, you should get a fast and clean rendering.

[Dink]

Re: Too much noise?

i'm tryng.

I didnt use before the light cache...... i use irradiance map and quasimontecarlo...

[dalomar_cg]

Re: Too much noise?

Yea... Thats going to be your noise right there. This whole time I thought you had QMC for Primary bounces. Typically QMC for secondaries doesn't have that much noise. Anyway, once you switch to LC for secondaries you can probably put the Noise Threshold back to .01

[siggi40]

Re: Too much noise?

Dear Micha, can you give the options you've mentioned in a file ? Its hard to find every option for an amateur I will load the option file to examine.. Thanks.

[Micha_cg]

Re: Too much noise?

A little problem is, that the option file override you environment settings. So must set your HDRIs at the env options again.

[siggi40]

Re: Too much noise?

HDRI to be used (if desired) both for GI and Background ?
and should I use the multiplier as 1 or increasing it would be better for the interior scene ?

[dalomar_cg]

Re: Too much noise?

Your multiplier is going to be based on the actual intensity of the hdr itself and your desired effect. Typically, because interiors have fewer openings to the environment, it is customary to increase the intensity of the hdr so that it adds more light to the interior (how much depends on how open the interior is). Keep in mind though that if you have anything outside (like a car in the drive way or something) that it will be very bright because it is open to all of the GI, so you'll have to deal with that one way or another. Also if your doing Exterior shots from the same model you will have to change the hdr's intensity because it will be far too bright from the outside.