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Bright spots when using night HDRIs

Unread postPosted: Thu Jun 25, 2020 2:50 pm
by Karen_Jonhson
Bright spots appear when using concrete_slab material from Megascans and lighting it with night HDRIs from HDRIhaven.
When it's a flat environment light (no IBL), or the IBL is daylight, I don't see the bight spots.
The HDRI texture map is defined in File color space as [Utility - Linear - sRGB]
Any idea what might be causing these?
I attach screen prints of the night HDRI render (using moonless golf HDRI), then the day HDRI render with no issues, then the original material from megascans.

Re: Bright spots when using night HDRIs

Unread postPosted: Thu Jun 25, 2020 2:53 pm
by Karen_Jonhson
more renders with night HDRIs (satara night, Hansaplatz, Kloppenheim 02)

Re: Bright spots when using night HDRIs

Unread postPosted: Thu Jun 25, 2020 3:48 pm
by dboude
Hard to say,

Maybe a specular lobe with no roughness in the material.

Could you share your project please ?

Thank you

Cheers

Re: Bright spots when using night HDRIs

Unread postPosted: Tue Jun 30, 2020 12:09 am
by esmith
Check some aovs like Glossy and Specular to find out what these are. I can't tell from the image if it's just a sample issue or what.

But you can try this quickly to see if it helps you
https://www.clarissewiki.com/4.0/firefl ... ering.html