#local p=function{pattern{granite}}

isosurface
{
	function
	{
		y-.3+p(x/10,9,z/10)
		
	}
	contained_by
	{
		box{-9,9}
	}
}
light_source
{
	<3,.5,8>,1
}
media
{
	scattering
	{
		2,
		<3,2,1>/9
	}
	emission<.3,.4,1>
	density
	{
		function
		{
			.1/(y+1)
		}
	}
}
sphere
{
	0,1
	pigment
	{
		granite 
		poly_wave 3
	}
	scale-7*y+9
	hollow
}