Introduction Importance of the night sky Ambiance of night scenes Applications –Films, planetarium...
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Transcript of Introduction Importance of the night sky Ambiance of night scenes Applications –Films, planetarium...
![Page 1: Introduction Importance of the night sky Ambiance of night scenes Applications –Films, planetarium shows, simulators, games.](https://reader035.fdocuments.in/reader035/viewer/2022062516/56649da15503460f94a8d640/html5/thumbnails/1.jpg)
Introduction
• Importance of the night sky
• Ambiance of night scenes
• Applications– Films, planetarium shows,
simulators, games
![Page 2: Introduction Importance of the night sky Ambiance of night scenes Applications –Films, planetarium shows, simulators, games.](https://reader035.fdocuments.in/reader035/viewer/2022062516/56649da15503460f94a8d640/html5/thumbnails/2.jpg)
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
![Page 3: Introduction Importance of the night sky Ambiance of night scenes Applications –Films, planetarium shows, simulators, games.](https://reader035.fdocuments.in/reader035/viewer/2022062516/56649da15503460f94a8d640/html5/thumbnails/3.jpg)
Model Overview
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Moon Position
• ~ 59% of the Moon is visible from the Earth• Rotates around itself at the same speed as around the
Earth• Elliptical orbit
![Page 5: Introduction Importance of the night sky Ambiance of night scenes Applications –Films, planetarium shows, simulators, games.](https://reader035.fdocuments.in/reader035/viewer/2022062516/56649da15503460f94a8d640/html5/thumbnails/5.jpg)
Modeling the Moon
• Geometric model– Albedo map– Elevation map
• Illuminated by– Sun (black body)– Earth (earthshine)
• Specialized BRDF
Data from the Clementine project
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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
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Low Moon over cityscape
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Close-up of rendered stars
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Fish-eye view of a clear, moonless night
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Time-lapse rendering of stars
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Moon and stars over the Little Matterhorn
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Moon rising above a mountain
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Full Moon with thin layer of clouds
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Gibbous Moon
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Earthshine
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Quarter moon with daylight
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Zodiacal light