Isotropix Forums

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.

more renders with night HDRIs (satara night, Hansaplatz, Kloppenheim 02)

Hard to say,

Maybe a specular lobe with no roughness in the material.

Could you share your project please ?

Thank you

Cheers

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