Noise in specular material

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Noise in specular material

Postby jbkrauss » Thu Jan 11, 2018 12:28 am

jbkrauss Thu Jan 11, 2018 12:28 am
Hello everyone,

I'm having a bit of an issue with a render of a diamond. Here's what it looks like :
https://imgur.com/a/OiExY

As you can see there's quite a bit of noise in the diamond. I've attached my render settings as well, maybe someone can give me an input?
Thanks !

PS: i tried with GI clamp=2. and it yielded the same results.
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Re: Noise in specular material

Postby bepeg4d » Thu Jan 11, 2018 11:00 am

bepeg4d Thu Jan 11, 2018 11:00 am
Hi jbkrauss,
if you enable the dispersion in specular materials, 1200 sampling are not enough.
Note that reducing the GI Clamp value you are also cutting all the caustics effects.
My suggestion is to increase a lot the max sampling, and enable the Adaptive sampling option, or, even better, switch to PMC kernel for this kind of scenes.
ciao beppe
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Re: Noise in specular material

Postby jbkrauss » Thu Jan 11, 2018 7:54 pm

jbkrauss Thu Jan 11, 2018 7:54 pm
bepeg4d wrote:Hi jbkrauss,
if you enable the dispersion in specular materials, 1200 sampling are not enough.
Note that reducing the GI Clamp value you are also cutting all the caustics effects.
My suggestion is to increase a lot the max sampling, and enable the Adaptive sampling option, or, even better, switch to PMC kernel for this kind of scenes.
ciao beppe


hello bepeg4d,
here is another album of the same render, in pathtracing @2000 samples. I was tweaking things around, and when I changed the sun size of my octanedaylight the noise disappeared.
I changed the sunsize from 20 to 1 (default I believe). Maybe I was overexposing stuff?
https://imgur.com/a/oa8cw
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