Speeds and other numbers

[anarion9]

I'm trying to set a more realistic Venus, adding a map for the surface (modifing the parameter for Texture and adding a CloudMap parameter in Atmosphere) and setting the height and motion of the clouds.
The day on Venus lasts about 243 of our days, but clouds run so fast that you can see them rotate in only 4 of our days, it's quite impressive think about winds there.
So I want to set the values for CloudHeight and CloudSpeed (like for Earth), but I don't know if they are in 10E3 Km and Km/h or whatelse....
Can anyone give me a suggestion?
Thank you
Anarion

[chris]

The units for cloud height are kilometers (above the surface of the planet), and the units for cloud speed are degrees per Julian Day (24 hours.) So, if the clouds on Venus rotate around the planet in about 4 Earth days, you should set the CloudSpeed to 90.

--Chris

[Guest]

Thank you, I made my corrections.
Now my Venus has theese parameters:

Code: Select all

"Venus" "Sol"
{   Texture "venusmap.jpg"
   # BumpMap "venusbump.jpg"
   HazeColor [ 0.5 0.35 0.2 ]
   HazeDensity 0.35
   Radius 6052
   Atmosphere {
      Height 60
      Lower [ 0.8 0.8 0.5 ]
      Upper [ 0.6 0.6 0.6 ]
      Sky [ 0.8 0.8 0.5 ]
      CloudHeight 40
      CloudSpeed 90
                CloudMap "venus.jpg"
   }
   CustomOrbit "venus"
   EllipticalOrbit {
      Period            0.6152
      SemiMajorAxis     0.7233
      Eccentricity      0.0068
      Inclination       3.3947
      AscendingNode     76.681
      LongOfPericenter 131.533
           MeanLongitude    181.979
   }
   RotationPeriod  5832.444
   Obliquity       177.4
   LongOfRotationAxis 302.07
   Albedo            0.77
}


The file Venusmap.jpg is a radar map from Magellan spaceprobe, and the file venus.jpg is the original image.
Going closer to the planet I saw that it seems that the cloud texture altitude isn't 40 km, but between 70 and 75 km... is my computer fault?
I see the same thing with the Earth clouds: in solarsys.ssc Cloudheight is 7, but going closer to the surface, their altitude is about 13 (note: the ratio between observed and wanted value is always near to 1.8).
Thanks for your attention
Anarion9