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

2. Overview
- Dividing the Atmosphere
- Approximation of Light-Intensity
- From Earth to Mars
- Drawbacks & Conclusion
> Peter Collienne > 20.09.2013www.DLR.de • Chart 2

3. 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

4. Bruneton‘s Approach
> Peter Collienne > 20.09.2013www.DLR.de • Chart 5

5. Rendering the Earth‘s Atmosphere
> Peter Collienne > 20.09.2013www.DLR.de • Chart 6

6. From Earth to Mars
> Peter Collienne > 20.09.2013www.DLR.de • Chart 7

7. 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/20050610
a/sunset_a489_gamma_2sub_800.jpg
www.DLR.de • Chart 8

8. Adjusting Parameters
> Peter Collienne > 20.09.2013www.DLR.de • Chart 9

9. http://www.jpl.nasa.gov/images/msl/20130315/pia16769.jpg
Parameter Estimation through Comparison
> Peter Collienne > 20.09.2013www.DLR.de • Chart 10

10. Parameter Estimation through Comparison
> Peter Collienne > 20.09.2013www.DLR.de • Chart 11

11. 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

12. 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

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