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Introduction
• Importance of the night sky
• Ambiance of night scenes
• Applications– Films, planetarium shows,
simulators, games
Sources of Illumination (W/m2)• Sun 103
• Moon 10-3
• Stars 10-8
• Zodiacal light 10-7
• Airglow 10-8
• Cosmic light10-10
• Dim misc. 10 -8 10-9
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
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