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> Peter Collienne > 20.09.2013 Physically Based Rendering of the Martian Atmosphere www.DLR.de • Chart 1

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Page 1: Physically Based Rendering of the Martian Atmosphere

> Peter Collienne > 20.09.2013

Physically Based Rendering of the Martian Atmosphere

www.DLR.de • Chart 1

Page 2: Physically Based Rendering of the Martian Atmosphere

Overview

- Dividing the Atmosphere- Approximation of Light-Intensity- From Earth to Mars- Drawbacks & Conclusion

> Peter Collienne > 20.09.2013www.DLR.de • Chart 2

Page 3: Physically Based Rendering of the Martian Atmosphere

Dividing the Atmosphere

> Peter Collienne > 20.09.2013

Air

Gas molecules Particles (Aerosols)(Dust, Water droplets)

(Rayleigh Scattering) (Mie Scattering)http://apod.nasa.gov/apod/image/1104/yuriearth_iss_3032.jpgv

www.DLR.de • Chart 3

Page 4: Physically Based Rendering of the Martian Atmosphere

Bruneton‘s Approach

> Peter Collienne > 20.09.2013www.DLR.de • Chart 5

Page 5: Physically Based Rendering of the Martian Atmosphere

Rendering the Earth‘s Atmosphere

> Peter Collienne > 20.09.2013www.DLR.de • Chart 6

Page 6: Physically Based Rendering of the Martian Atmosphere

From Earth to Mars

> Peter Collienne > 20.09.2013www.DLR.de • Chart 7

Page 7: Physically Based Rendering of the Martian Atmosphere

The Martian Atmosphere

- Less dense than Earth‘s atmosphere- Rayleigh Scattering has close to no impact

- Iron oxide dust is reason for color of the atmosphere

- Mie Scattering doesn‘t account for colored particles

> Peter Collienne > 20.09.2013

Adjust Parameters http://marsrovers.jpl.nasa.gov/gallery/press/spirit/20050610a/sunset_a489_gamma_2sub_800.jpg

www.DLR.de • Chart 8

Page 8: Physically Based Rendering of the Martian Atmosphere

Adjusting Parameters

> Peter Collienne > 20.09.2013www.DLR.de • Chart 9

Page 9: Physically Based Rendering of the Martian Atmosphere

http://www.jpl.nasa.gov/images/msl/20130315/pia16769.jpg

Parameter Estimation through Comparison

> Peter Collienne > 20.09.2013www.DLR.de • Chart 10

Page 10: Physically Based Rendering of the Martian Atmosphere

Parameter Estimation through Comparison

> Peter Collienne > 20.09.2013www.DLR.de • Chart 11

Page 11: Physically Based Rendering of the Martian Atmosphere

Drawbacks

> Peter Collienne > 20.09.2013

- Rendering the atmosphere costs about 10% of framerates- Artifacts can appear over the horizon due to numerical instability

- Correcting this using interpolation results in performance-loss

- Shape of the planet is assumed to be a perfect sphere- Limited to constant density per radius

- ‚Clear-Sky‘-Model is not the perfect approximation

www.DLR.de • Chart 12

Page 12: Physically Based Rendering of the Martian Atmosphere

Conclusion

- Interactive visualization of the martian atmosphere

- Using a set of parameters derived from a physical approach and partially validated by available imagery.

- Implemented as a plugin to work with arbitrary planetary rendering frameworks

> Peter Collienne > 20.09.2013www.DLR.de • Chart 13

Page 13: Physically Based Rendering of the Martian Atmosphere

> Peter Collienne > 20.09.2013www.DLR.de • Chart 14


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