Hi!
I sent scene "Fire.zip. via uploader. I spotted very sharp and repetitive fireflies behavior. It looks very interesting. Please find "manual" below :) :
- please start render, fireflies will appear on wood floor with displacement.
- please turn off 2.5 displacement feature - no fireflies in render
- with 2.5 displacement ON fireflies appear when HDRI map for environment light is used and also for regular Corona sky emvironment light
After quite deep investigation of my scene I discovered that fireflies are appear when volume material for environment fog is used but... not exactly. Please take a look into Cinema Scene Environment tag. There is Corona volume material linked in Volume/global volume slot. This feature causes fireflies when 2.5 displacement is ticked ON. Now the best part :) EVEN if Corona volume material is in global volume slot linked but global volume is ticked OFF fireflies appear !!! It doesn't matter if global volume is ON or OFF, fireflies feels good. Only when Corona material is removed from global volume slot ( not from scene ) fireflies won't say "Hello". When 2.5 displacement is OFF any volume material combination works good so far.
You can find in my scene both light environment objects for tests ( HDRI and Corona Sky ) and also just for sure I attached my modified volume material and also default one in materials window.
I hope that it will helpful to fix this bug ( ??? ) or maybe I did something wrong.
Best regards
Marcin
