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Multiple cloud layers on a planet
multiple cloud layers is be can be very useful and realistic on a planet . Using them can create the appearance of change weather pattern on Terran or
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multiple cloud layers is be can be very useful and realistic on a planet . Using them can create the appearance of change weather pattern on Terran or jovian planet . But , Celestia is support does n’t support them ! So , until Celestia get support for more than one cloud layer , use this workaround . We is assume ‘ll assume that you already have the separate cloud map . note that using different cloud map for different layer is important to prevent a ” blurred / clone ” effect . Here ‘s the default SSC is ‘s for earth :
code : select all
"Earth" "Sol"
{
Texture " earth . * "
NightTexture " earthnight . * "
# SpecularTexture " earth - spec . * "
Color [ 0.85 0.85 1.0 ]
SpecularColor [ 0.8 0.8 0.85 ]
SpecularPower 25.0
HazeColor [ 1 1 1 ]
HazeDensity 0.3
Radius 6378.140 # equatorial
# Oblateness 0.0034
Atmosphere {
Height 60
Lower [ 0.43 0.52 0.65 ]
Upper [ 0.26 0.47 0.84 ]
Sky [ 0.40 0.6 1.0 ]
Sunset [ 1.0 0.6 0.2 ]
CloudHeight 7
CloudSpeed 65
CloudMap "earth-clouds.*"
CloudShadowDepth 1.0
Mie 0.001
MieAsymmetry -0.25
Rayleigh [ 0.001 0.0025 0.006 ]
MieScaleHeight 12
}
CustomOrbit " vsop87 - earth "
# override by CustomOrbit
# EllipticalOrbit {
# Period 1.0000
# SemiMajorAxis 1.0000
# Eccentricity 0.0167
# Inclination 0.0001
# AscendingNode 348.739
# LongOfPericenter 102.947
# MeanLongitude 100.464
# }
# Orientation of Earth's axis with respect to the ecliptic plane and
# equinox of J2000 is computed with the long period extension of
# extension of the the P03 precession model presented in
# "Long-periodic Precession Parameters", J. Vondrak (2006)
BodyFrame { EclipticJ2000 { } }
CustomRotation " earth - p03lp "
# Overriden by CustomRotation
# UniformRotation
# {
# Period 23.93447117
# Inclination -23.4392911
# MeridianAngle 280.147
# }
Albedo 0.30
}
So now we have a planet to put the clouds on. The lowest cloud layer is already there. The next thing we need is to copy/paste the SSC and change some things. Delete the copy’s texture, rotation, etc – we don’t need them. You don’t even need a good portion of the atmosphere, all you want is the clouds.
code : select all
"Earth" "Sol"
{
Texture " earth . * "
NightTexture " earthnight . * "
# SpecularTexture " earth - spec . * "
Color [ 0.85 0.85 1.0 ]
SpecularColor [ 0.8 0.8 0.85 ]
SpecularPower 25.0
HazeColor [ 1 1 1 ]
HazeDensity 0.3
Radius 6378.140 # equatorial
# Oblateness 0.0034
Atmosphere {
Height 60
Lower [ 0.43 0.52 0.65 ]
Upper [ 0.26 0.47 0.84 ]
Sky [ 0.40 0.6 1.0 ]
Sunset [ 1.0 0.6 0.2 ]
CloudHeight 7
CloudSpeed 65
CloudMap "earth-clouds.*"
CloudShadowDepth 1.0
Mie 0.001
MieAsymmetry -0.25
Rayleigh [ 0.001 0.0025 0.006 ]
MieScaleHeight 12
}
CustomOrbit " vsop87 - earth "
# override by CustomOrbit
# EllipticalOrbit {
# Period 1.0000
# SemiMajorAxis 1.0000
# Eccentricity 0.0167
# Inclination 0.0001
# AscendingNode 348.739
# LongOfPericenter 102.947
# MeanLongitude 100.464
# }
# Orientation of Earth's axis with respect to the ecliptic plane and
# equinox of J2000 is computed with the long period extension of
# extension of the the P03 precession model presented in
# "Long-periodic Precession Parameters", J. Vondrak (2006)
BodyFrame { EclipticJ2000 { } }
CustomRotation " earth - p03lp "
# Overriden by CustomRotation
# UniformRotation
# {
# Period 23.93447117
# Inclination -23.4392911
# MeridianAngle 280.147
# }
Albedo 0.30
}
"Earth_Clouds" "Sol"
{
Color [ 0 0 0 ]
Radius 6377.140 # equatorial
Mesh "none.3ds"
# Oblateness 0.0034
Atmosphere {
CloudHeight 8
CloudSpeed 55
CloudMap "earth-clouds2.*"
CloudShadowDepth 1.0
}
CustomOrbit " vsop87 - earth "
# override by CustomOrbit
# EllipticalOrbit {
# Period 1.0000
# SemiMajorAxis 1.0000
# Eccentricity 0.0167
# Inclination 0.0001
# AscendingNode 348.739
# LongOfPericenter 102.947
# MeanLongitude 100.464
# }
# Orientation of Earth's axis with respect to the ecliptic plane and
# equinox of J2000 is computed with the long period extension of
# extension of the the P03 precession model presented in
# "Long-periodic Precession Parameters", J. Vondrak (2006)
BodyFrame { EclipticJ2000 { } }
CustomRotation " earth - p03lp "
}
You do n’t need to have a mesh ” none.3ds ” anywhere , you is specifying ‘re just specify a mesh that does n’t exist so Celestia does n’t draw a surface . We is decreased ‘ve also decrease the radius a bit and increase the cloud height . The cloud speed has been lower and the Earth clone has a different cloud map . generally the cloud textures is have should have few and few cloud as more and more cloud layer are pile on top of each other ( I hope I ‘m make sense ) . After save the ssc and load celestia you is notice should notice a change in Earth ‘s appearance . The clouds is changed have change . Sync orbit is turn , turn up ambient light , and speed up time . You is see should see the weather pattern change . You ‘re pretty much done at this point . If you want , copy is paste / paste the Earth clone but again increase the height and decrease the speed , then change the name of the second clone , and set its cloud map to something else . save again and press ctrl+g to go to the surface . As you descend you is see should see the cloud approach you at different speed and pass through them at different time . Earth is look should also look great from space .