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Introduction

Introduction. Importance of the night sky Ambiance of night scenes Applications Films, planetarium shows, simulators, games. Sun 10 3 Moon 10 -3 Stars 10 -8. Zodiacal light 10 -7 Airglow 10 -8 Cosmic light 10 -10 Dim misc. 10 -8 10 -9. Sources of Illumination ( W/m 2 ).

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Introduction

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Presentation Transcript

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

  2. Sun 103 Moon 10-3 Stars 10-8 Zodiacal light 10-7 Airglow 10-8 Cosmic light 10-10 Dim misc. 10 -8 10-9 Sources of Illumination (W/m2)

  3. Model Overview

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

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

  6. 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

  7. Low Moon over cityscape

  8. Close-up of rendered stars

  9. Fish-eye view of a clear, moonless night

  10. Time-lapse rendering of stars

  11. Moon and stars over the Little Matterhorn

  12. Moon rising above a mountain

  13. Full Moon with thin layer of clouds

  14. Gibbous Moon

  15. Earthshine

  16. Quarter moon with daylight

  17. Zodiacal light

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