> Another way, is to set the window,and the wall in witch it's set, as no_shadow.

Using no_shadow is the better way since this significantly speeds up an
indoors scene (often by 2x). Infact, extend that to include all walls not
casting shadows (read: every single wall + roof & floor if the room is just a
modified box).

As a rule of thumb one should always use the no_shadow keyword whenever it
doesn't break a scene.

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