I downloaded a 2k venusclouds and the 8k venussurface, and was trying to see the clouds in celestia when they are enabled, and the surface when clouds are turned off.
I do get this functionality, but with clouds on it has this weird look. as if the clouds are at exactly the same height as the surface texture.
"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 50
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
}