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Left: without light_portal (skydome_light only). Right: with light_portal.


Skydome lights can use light portals to reduce noise for interior scenes, where the light comes in through relatively small openings. Instead of emitting light, they can be used to guide skydome light sampling. Light portals must be placed to cover all windows, doors, and other openings through which skydome light comes into the scene.

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The skydome_light also has a portal_mode parameter with options off, interior_only and interior_exterior to respectively turn off portals, block any light outside portals for interior only scenes, and let light outside portals through for mixed interior and exterior scenes. Blocking light outside portals more predictably reduces noise for interior-only scenes.

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