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The following POV code is an adaptation of Mike Andrews clouds.pov code
for just the clouds. I have a need to see how it was done, but in units
of feet and not miles. I have tried to modify it, but it comes out pure
black - though it renders just as slowly as his clouds.pov scene! Anyone
know what I am doing wrong?
Jon
// Start of cloud code ... rather a mess.#declare cloudShape = density
{ spotted ramp_wave }
#declare D_Cloud_Center =density { cloudShape triangle_wave
colour_map { [0.5 colour Gray95] [1.0 colour Gray75] }}
// Calculate the correct colour_map values.#declare NT =
floor((groundRad + 6) / 6);#declare DT = (groundRad + 6)*5280 /
NT;#declare V1 = 1 - (6 - 2.0)*5280 / DT;#declare V2 = 1 - (6 -
2.5)*5280 / DT;#declare V3 = 1 - (6 - 3.5)*5280 / DT;#declare V4 = 1
- (6 - 4.5)*5280 / DT;#declare V5 = 1 - (6 - 5.5)*5280 / DT;#declare
V6 = 1 - (6 - 6.0)*5280 / DT;
// container for cloud.difference { sphere { 0, (groundRad + 6.0)*5280
} sphere { 0, (groundRad + 3.5)*5280 } pigment { rgbf 1 } interior {
media { intervals mSamples scattering { 2, rgb 5
extinction 1.0} samples 2, mSamples confidence 0.9999
variance 1/1000 density { D_Cloud_Center scale 2*3*0.2*5280
} // fine scale cloud detail density { D_Cloud_Center scale
2*3*0.08*5280 } density { // confine the cloud to the
container onion colour_map { [V1 rgb 0]
[V2 rgb 0] [V3 rgb 0] [V4 rgb 1] [V5 rgb 1]
[V6 rgb 0] } scale DT } //
large scale cloud detail density { onion
colour_map { [V1 rgb 0] [V2 rgb 1] [V3 rgb 1]
[V4 rgb 0] [V5 rgb 0] [V6 rgb 0] } warp
{ turbulence 0.25*0.8 octaves 3 lambda 3 omega 0.7 } scale DT
} } } translate -groundRad*5280*y hollow}
// atmosphere #declare NT = floor((groundRad + 20.0) / 20.0);#declare
DT = (groundRad + 20.0)*5280 / NT;#declare V1 = 1 - (20.0 -
5.0)*5280 / DT;#declare V2 = 1 - (20.0 - 5.0)*5280 / DT;
sphere { 0, (groundRad + 20.0)*5280 pigment { rgbf 1 } interior {
media { intervals mSamples scattering { 4, rgb atmCol
extinction 1 } samples 2, mSamples confidence 0.9999 variance
1/1000 density { onion ramp_wave
colour_map { [V1 rgb 1] [V2 rgb 0.5]
[1 rgb 0] } } scale DT } }
translate -groundRad*5280*y hollow}
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