Ive tried everything turning off caustics, ive turned on simplify, denoising is on, multiple importance is on, increased transparency, filter glossy all the way up to 10 (although there isnt glossy objects).

This is with denoising:

enter image description here

This is without:

enter image description here

  • $\begingroup$ How many samples are you using? However many you are using now, use more. Denoising is not always perfect, and is not a one size fits all tool for all scenes. $\endgroup$ – Timaroberts Mar 24 '18 at 5:13
  • $\begingroup$ I was using 250 so o guess I'll go up to 500 $\endgroup$ – Alex Pensotti Mar 24 '18 at 5:19
  • $\begingroup$ Are you just trying to get the glare from the bright lightening? If so, how about a ‘fog’ glare node in the compositor? It would be much less noisy and far faster to render. $\endgroup$ – Rich Sedman Mar 24 '18 at 10:54
  • $\begingroup$ There's a volume scatter surrounding the trees and lightning so there would still be noise right I'd just be adding an effect on top to hide it $\endgroup$ – Alex Pensotti Mar 24 '18 at 12:21
  • $\begingroup$ Yes - I was thinking instead of the volume scatter. If you wanted the trees to be infront of the 'glare' then you could render them on a separate layer and composite them together. $\endgroup$ – Rich Sedman Mar 24 '18 at 17:53

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