Remaining sparklies

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Remaining sparklies

Postby moose69 » Wed Oct 25, 2017 2:37 pm

moose69 Wed Oct 25, 2017 2:37 pm
Hi All

Please see attached an image I have produced. I cannot seem to get rid of the last sparklies in the top of the 3 bottles. I have set Path tracing up as I see best from the manual but these settings no matter how high the Max samples remove them.

As I understand I have Upped caustic blur, reduced GI clamp and allowed adaptive sampling to do it's thing but to no avail. Any thoughts would be appreciated.

System 6 core i7 / 32GB RAM / 2x 1070 + 1x 1080, Octane 3.06 in C4D R18

settings.jpg

settings.jpg


Thanks
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mer group outside.jpg
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Re: Remaining sparklies

Postby bepeg4d » Thu Oct 26, 2017 10:54 am

bepeg4d Thu Oct 26, 2017 10:54 am
Hi moose69,
please update to 3.07-R1:
viewtopic.php?f=85&t=63700
About the noise in liquid:
what is your exposure value?
Could post a screenshot off the noise pass in that zone?
Did you tried to add a render region in that zone?
Are you using an HDRI for lighting?
ciao beppe
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Re: Remaining sparklies

Postby moose69 » Thu Oct 26, 2017 5:03 pm

moose69 Thu Oct 26, 2017 5:03 pm
Hi

exposure 1.8

yes HDRI

no render region as will be animating over 5 seconds

image attached showing noise

thanks
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noise.png
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Re: Remaining sparklies

Postby bepeg4d » Fri Oct 27, 2017 5:14 am

bepeg4d Fri Oct 27, 2017 5:14 am
Hi moose69,
please, always set the expected exposure as the same has the exposer value in the imager.
Sorry, it is possible to see the noise pass at the end of render time?
Are you using RGB Spectrum node in Absorption for coloring the liquid?
ciao beppe
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Re: Remaining sparklies

Postby moose69 » Fri Oct 27, 2017 10:15 am

moose69 Fri Oct 27, 2017 10:15 am
Thanks I will do another noise render.

What difference will the expected exposure make?

The liquids are coloured in transmission with roughness and no medium input
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Re: Remaining sparklies

Postby bepeg4d » Fri Oct 27, 2017 4:04 pm

bepeg4d Fri Oct 27, 2017 4:04 pm
Hi moose69,
about Expected exposure value, it’s a general rule when you use Adaptive sampling, otherwise leave the value at 0:
Expected exposure: The expected exposure should be approximately the same value as the exposure in the imager or 0 to ignore this setting. The default is 0. It's used by adaptive sampling to determine which pixels are bright and which are dark, which obviously depends on the exposure setting in the imaging settings.
If set to something not 0, adaptive sampling tweaks/reduces the noise estimate of very dark areas of the image. It also increases the min. adaptive samples limit for very dark areas which tend to find paths to light sources only very irregularly and thus have a too optimistic noise estimate.


About color in transmission, you can use a Gaussian color node instead of RGB color node, probably you should have less noise inside the liquid.
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Re: Remaining sparklies

Postby moose69 » Fri Oct 27, 2017 9:08 pm

moose69 Fri Oct 27, 2017 9:08 pm
Thanks

I reduced GI clamp, increased caustic blurring, reduced hot pixel value and changed the expected exposure as suggested and obtained a satifactory result.

Thanks for your help :-)
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