light_source{<0,100,-50> color rgb 10}
background{blue 1}
#declare r0=2;
#declare r1=1;


#declare AMBIENT_VARIABLE=0;
#while(AMBIENT_VARIABLE<1.1)

parametric {
   function { cos(u)*(r0+r1*cos(v)) }
   function { sin(u)*(r0+r1*cos(v)) }
   function { r1*sin(v) }
   <0,0>, <2*pi,pi>
   contained_by { sphere{0, 4.1} }
   max_gradient .14
   accuracy 0.001  //  0.0001
   precompute 10 x,y,z
   texture{pigment {rgb 1}
   finish{ambient AMBIENT_VARIABLE}
   }
   translate 12*z+x*(-4+8*AMBIENT_VARIABLE)
}


#declare AMBIENT_VARIABLE=AMBIENT_VARIABLE+1;
#end

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