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I am working on my render and I have an hdr word background, I am trying to activate Multiple Importance Sampling like in previous Blender and I can't find it. Anyone knows where is it or what changed? thanks alot in advance.

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It is under the Properties Window > World Settings > Surface change Sampling from Auto to Manual.

Multiple importance sampling is only available for volumes, under Volume > Sampling change from Equiangular to Multiple Importance.

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    $\begingroup$ Hi, thanks a lot for your answer, yes but it doesn't have the check box for " Multiple Importance Sampling" does it comes activated by default? what has changed? is not clear $\endgroup$ – zensir Dec 4 '18 at 14:50
  • $\begingroup$ Before you only had the checkbox option, now you have the "Distance", "Equiangular" and "Multiple Importance" options. $\endgroup$ – Francisco Arleo Dec 4 '18 at 16:04
  • $\begingroup$ thanks a lot guys! now I have to learn what the new options do. is there any documentation on this? cheers! $\endgroup$ – zensir Dec 4 '18 at 22:05
  • $\begingroup$ Here is the Blender 2.80 Reference Manual docs.blender.org/manual/en/dev $\endgroup$ – Francisco Arleo Dec 4 '18 at 22:17

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