Post on 26-May-2015
> Peter Collienne > 20.09.2013
Physically Based Rendering of the Martian Atmosphere
www.DLR.de • Chart 1
Overview
- Dividing the Atmosphere- Approximation of Light-Intensity- From Earth to Mars- Drawbacks & Conclusion
> Peter Collienne > 20.09.2013www.DLR.de • Chart 2
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
Bruneton‘s Approach
> Peter Collienne > 20.09.2013www.DLR.de • Chart 5
Rendering the Earth‘s Atmosphere
> Peter Collienne > 20.09.2013www.DLR.de • Chart 6
From Earth to Mars
> Peter Collienne > 20.09.2013www.DLR.de • Chart 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/20050610a/sunset_a489_gamma_2sub_800.jpg
www.DLR.de • Chart 8
Adjusting Parameters
> Peter Collienne > 20.09.2013www.DLR.de • Chart 9
http://www.jpl.nasa.gov/images/msl/20130315/pia16769.jpg
Parameter Estimation through Comparison
> Peter Collienne > 20.09.2013www.DLR.de • Chart 10
Parameter Estimation through Comparison
> Peter Collienne > 20.09.2013www.DLR.de • Chart 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
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
> Peter Collienne > 20.09.2013www.DLR.de • Chart 14