Am 03.04.2017 um 03:08 schrieb Mike Horvath:

> Forgot to mention there are strange square shaped artifacts in the blue
> end caps of the scene. They exist in the source images as well. I don't
> know what causes them.

Looks like radiosity artifacts to me.
Your scene may need a more exhaustive radiosity pretrace.

Make sure you have `always_sample` set to `off` (or not set at all).

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