Introduction Importance of the night sky Ambiance of night scenes Applications –Films, planetarium shows, simulators, games.

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Presentation transcript:

Introduction Importance of the night sky Ambiance of night scenes Applications –Films, planetarium shows, simulators, games

Sources of Illumination (W/m 2 ) Sun10 3 Moon Stars10 -8 Zodiacal light10 -7 Airglow10 -8 Cosmic light Dim misc

Model Overview

Moon Position ~ 59% of the Moon is visible from the Earth Rotates around itself at the same speed as around the Earth Elliptical orbit

Modeling the Moon Geometric model –Albedo map –Elevation map Illuminated by –Sun (black body) –Earth (earthshine) Specialized BRDF Data from the Clementine project

BRDF of the Moon Low albedo (7%) Reddish color Backscattering (much brighter at full moon) No limb darkening (uniform disc at full moon) Constant across the surface We decouple BRDF, spectral properties and albedo Photo by Antonio Cidadao

Low Moon over cityscape

Close-up of rendered stars

Fish-eye view of a clear, moonless night

Time-lapse rendering of stars

Moon and stars over the Little Matterhorn

Moon rising above a mountain

Full Moon with thin layer of clouds

Gibbous Moon

Earthshine

Quarter moon with daylight

Zodiacal light