portal 

Roll over image to view scene without light_portal (skydome_light only)

 

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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