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

2. Sources of Illumination (W/m 2 ) Sun10 3 Moon 10 -3 Stars10 -8 Zodiacal light10 -7 Airglow10 -8 Cosmic light10 -10 Dim misc.10 -8 10 -9

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

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