I have no idea why, but this keeps happening to my renders, most of the time, when volumetric lighting is involved, sometimes not. But is there any way to fix it?

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These are sometimes called fire flies. This can be eliminated by setting the "clamp indirect"value to 1, found in the "sampling" section in the "render" tab.

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  • $\begingroup$ I don't think OP is asking about fireflies, but hidden objects. $\endgroup$ – Luciano Dec 9 '19 at 13:54
  • $\begingroup$ Sorry, miss understood the question then. Still worth a try though, you never know. $\endgroup$ – Franck Louis Dec 9 '19 at 13:57
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    $\begingroup$ Fireflies are significantly smaller, I would hate to find a firefly that big! $\endgroup$ – Moog Dec 9 '19 at 14:45
  • $\begingroup$ @Moog maybe it's just a different type of firefly that you haven't seen before firefly.org/types-of-fireflies.html $\endgroup$ – Luciano Dec 9 '19 at 15:10
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    $\begingroup$ Its possible its a mutation. $\endgroup$ – Franck Louis Dec 9 '19 at 15:27

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