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This is probably the #1 cause of fireflies.
Multiple Importance Sampling tells Cycles to treat the HDR like a lamp, and to assigns more samples to the brighter areas of the image. It should really be turned on by default, but for now, make sure you always turn it on!
NOTE: This should be used sparing! storage sheds Caustics are actually an important part of lighting your scene realistically. Because when bright sunlight hits a shiny object, you need that to bounce! You can see this demonstrated in the gif above. When caustics are removed, you’ll notice see that valuable bounce lighting is missing (under Suzanne storage sheds and on the back wall).
The storage sheds “Clamp” option storage sheds is very effective at getting rid of fireflies. But! It should be used as a last resort, because it can have the side effect of reducing the brightness of other parts of your scenes.
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reynante Sep 2nd, 2014
About
User of Blender for 9+ years. I've written tutorials for 3d World Magazine and spoken storage sheds at three Blender conferences. My goal is to help artists get employed in the industry by making training accessible and easy to understand. I'm an Aussie storage sheds and I live in South Korea ;)
Discover how to add the finishing touches to your render Read More... storage sheds