Autodesk 256B1-05A761-1301 - AutoCAD Revit Structure Suite 2010 User Manual page 1269

Setting
Daylight Portal Options (only applies to sunlit interiors): These settings are available only for interior views that include
daylight. See Daylight Portals
Windows
Doors
Curtain Walls
Daylight Portals
During the rendering process, daylighting is performed automatically. For advanced lighting quality in
interior views, you can enable daylight portals, if needed. Daylight portals improve the quality of light that
shines through windows, doors that contain windows or glass, and curtain walls.
Rendered image without daylight portals
Rendered image with daylight portals
Daylight portals are useful only for interior views that include sunlight. That is, on the Rendering dialog,
under Lighting, the selected Scheme must be Interior: Sun only, or Interior: Sun + Artificial. (See
Lighting in a Rendered Image
By default, daylight portals are turned off. If a rendered image shows sunlight reflecting off surfaces, and
the sunlight is speckled or splotchy, you may be able to improve the image by turning on daylight portals.
NOTE The use of daylight portals can significantly increase render time.
Description
on page 1227.
Whether the rendering engine calculates daylight portals for windows.
By default, this setting is turned off.
Whether the rendering engine calculates daylight portals for doors
that contain glass. By default, this setting is turned off.
Whether the rendering engine calculates daylight portals for curtain
walls. By default, this setting is turned off.
on page 1228.)
Controlling
Defining Render Settings | 1227