light_portal

portal 

Rollover 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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