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I have a scene with a Boolean modifier cutting into geometry with difference, when appending both the cutter and base mesh to a different scene the Boolean works as expected. Viewport cycles render displays expected result as well. counterclockwise starting at the bottom is the other file's cycles render, then the cycles viewport native file render, then cycles f12 render native file.

Does anyone know what the issue could be?

enter image description here

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    $\begingroup$ At first glance I'd say, the cutting object is set to be invisible in the 3D viewport, but not for rendering. $\endgroup$
    – Gordon Brinkmann
    Commented Jun 16, 2021 at 13:25
  • $\begingroup$ if Gordons answer doesn't help, please provide blend file so we can check it out $\endgroup$
    – Chris
    Commented Jun 16, 2021 at 13:47
  • $\begingroup$ @GordonBrinkmann Unfortunately not the issue as I the picture from the other file has perfect operation performance. I assume it to be a bug relating to file size. $\endgroup$
    – HauptmannPingu
    Commented Jun 16, 2021 at 14:59
  • $\begingroup$ Are you applying any modifiers before the boolean that results in a different viewport vs. render poly count? e.g. Subsurface $\endgroup$
    – Lowlande52
    Commented Jun 16, 2021 at 16:26

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Problem is due to Blender being unstable at render with high polygons. Probably best to wait for a newer 2.9.3 version.

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