I'm working on an archiviz scene, multiflat house with a little garden. In the garden, I'm adding a small pool, created in a separate file and then imported in this. During the pool creation, I played a little to set up caustics and I got a pretty good result, done in 5 minutes render in fullhd.

Now, in this scene, if caustics are activated, render time, from 10/12 minutes, render time goes up to 20-40 hours.

Is there any known bug by a chance?


  • $\begingroup$ They're just very calculation heavy in an unbiased path tracer $\endgroup$ May 26 at 13:49
  • 1
    $\begingroup$ i guess the issue here is that you have a much more complex scene between your lone pool and your full house with garden. If Blender tries to do caustics everywhere,that explains it. Maybe try to isolate your pool in a layer or even a scene and enable caustics only on that layer/scene and assemble everything in comp. $\endgroup$
    – L0Lock
    May 26 at 15:02


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