Noise, Artifacts...whatever.

[blowback]

I have a problem that I cannot isolate, or fix. I have circled the problem. Were is this noise coming from? What the f? I can't get rid of it. Does it have something to do with the material?

 

Here was my settings.

 

Adaptive DMC

min 3 max 6 cl thrsh .002

 

clr map

Reinhrd

MULT1

Burn.85

GAMA2.2

 

IR map

 

Med

50 / 50

 

Light Cache

 

1200

 

DMC

 

noise thrsh .002 16 samples

[Nic H]

you got a vray sun or hdri in there for lighting?

subpixel and clamp output ticked?

[blowback]

VRray sun/sky and phys camera. I don't have the clamped output checked. I am trying not to use it, if I can help it.

[Nic H]

why not? are u rendering to exr or something?

[blowback]

I read....(not sure... chaos forums maybe) that if you use that option the render engine behaves "less physically real."

[Nic H]

lol

unless you are a scientist dont bother, just check the boxes and get rid of the artifacts!

[Brian Smith]

I read....(not sure... chaos forums maybe) that if you use that option the render engine behaves "less physically real."

 

who cares if it's physically real or not. you can great equally realistic results with standard lights and photometric lights...standard cameras or vray physical cameras ...linear color mapping or exponential color mapping...and so on. whether a setting or feature is based on real world physics should be one of the least important things driving your workflow... and unless every single aspect of your scene is perfect, having real world settings is worthless.

 

definitely enable clamp output and subpixel mapping on every scene by default. that will probably fix the problem. believe it or not, doing so can sometimes speed up renderings. these dots are caused by bright pixels being located next to dark pixels and the bright pixels wanting to be displayed at a value higher than 765 (255x3) and not being 'clamped' at 765 before being averaged with surrounding pixels by the image sampler. and the reason it wants to be display higher than 765, as nicnic mentioned, is extremely high intensity light sources...like hdri's or the vray sun

 

btw, that 0.002 setting for your image sampler is a waste...the lower you drop it the less adaptive the image sampler becomes and the less it will take advantage of the min value you use. if you use a value of 0.000, then the 3 is completely ignored because 0.000 would be requiring a perfectly noiseless image (which any min rate would be incapable of). besides that, a max value of 6 could almost never achieve that noise level either. try a value of 0.005 or maybe as low as 0.003 when you just don't care much about render times.

[blowback]

I feel like I just in trouble from the teacher ....

 

Thanks. My work flow has been all over the map this year. Some good some.....not so good. I don't know why I was so hung up on the CLAMP..... physically real....stuff. Sometimes you need to be straitened out! lol That Nic Brian....I needed that

[gfa2]

Christopher, unless you are doing some serious compositing with your images you won't even notices the clamping. It just keeps any color from being brighter that pure white. So unless you need that for compositing...don't sweat it...just clamp it.

[blowback]

Thanks Gary,

 

I will. I should have looked into that a little further. So much to know.....you read stuff every day, check tutorials, etc.....mash it all together to make your own workflow.......

 

Brian,

Should I be more concerned with my max and min settings than noise thrshld?