indeed they doesn't works. I must had misunderstood something in the past about the atomsphere settings.Whole Earth View
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FarGetaNik
- Posts: 484
- Joined: 05.06.2012
- With us: 12 years 5 months
- Location: Germany
My first release of Project Echoes is done, but Earth remained an odd case as it still didnt seem to fit in with my new more realistic renders of the major solar system bodies. I want to give an update on my most recent findings about rendering Earth in Celestia.
The BMNG data set is great as it is in high resolution (85k textures) but the coloring is off... I assume the filters used to compose the RGB images are far from what humans perceive as red green and blue. I found a map of the Earth in lower (12k) resolution featuring colors that matches what we see across several spacecraft imagery.
After a lot of image processing I was left with a map of Earth I was somewhat statisfied with. Next step was to update the atmosphere definition. Recently I found out that the Rayleigh, Mie and Absorption parameters in Celestia give the fraction of scattered light per kilometer. With this information and some digging I was able to get good estimates for the Rayleigh and Absorption parameter valaues. Not so much for Mie though. I settled with this atmosphere definition for Earth:
Leaving me with this view of the Earth that finally looks very realistic to me:
The BMNG data set is great as it is in high resolution (85k textures) but the coloring is off... I assume the filters used to compose the RGB images are far from what humans perceive as red green and blue. I found a map of the Earth in lower (12k) resolution featuring colors that matches what we see across several spacecraft imagery.
After a lot of image processing I was left with a map of Earth I was somewhat statisfied with. Next step was to update the atmosphere definition. Recently I found out that the Rayleigh, Mie and Absorption parameters in Celestia give the fraction of scattered light per kilometer. With this information and some digging I was able to get good estimates for the Rayleigh and Absorption parameter valaues. Not so much for Mie though. I settled with this atmosphere definition for Earth:
Code: Select all
Atmosphere
{
Height 100
CloudHeight 7
CloudMap "earth-clouds.*"
Mie 0.001
MieAsymmetry -0.7
MieScaleHeight 8.5 # Rayleigh scale height
Rayleigh [ 0.0054 0.0081 0.0167 ]
Absorption [ 0.0043 0.0027 0.0003 ] # assuming total absorbed fraction for 1 scaleheight
}
Leaving me with this view of the Earth that finally looks very realistic to me:
