Here is the media for the cloud sphere, which is the inner of the two 
volumes. What I need is to be able to "clip" the media to "InnerRadius" 
and "OuterRadius" so that I can then simply copy/move the media to the 
larger atmosphere sphere.

-Mike

//BEGIN

	#local InnerRadius = EarthRadius + CloudMinRad;
	#local OuterRadius = InnerRadius + CloudMaxRad;
	#local BoundRadius = sin(acos(EarthRadius/OuterRadius)) * OuterRadius;
	#local ScaleAmount = Width/2;
//	#local testpattern = function {mod(sqrt(Sqr(X) + Sqr(Y) + Sqr(Z)), 1.0)}
	#local CloudPigment = pigment
	{
		average
		pigment_map
		{
			[2 onion	scale CloudMaxRad/ScaleAmount	phase 
-mod(OuterRadius,CloudMaxRad)/CloudMaxRad/ScaleAmount]
			[2 granite	scale 1024 * 32/ScaleAmount]
		}
	}
	#local CloudMedia = media
	{
		scattering	{1, 0.5 * 1/ScaleAmount / 320}
		method		3
		intervals	1
//		samples		30	//30, 100
		samples		4
		density
		{
			pigment_pattern {CloudPigment}
			density_map {[0.60 rgb 0][0.61 rgb 1]}
		}
	}
	#local CloudSphere = difference
	{
		sphere {0, OuterRadius}
		sphere {0, InnerRadius}
		bounded_by {cylinder {<0,EarthRadius,0,>, <0,OuterRadius,0,>, 
BoundRadius}}
		hollow
		material
		{
			texture {pigment {rgbt 1}}
			interior
			{
				media {CloudMedia}
			}
			scale ScaleAmount
		}
		translate -y * EarthRadius
	}

//END

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