//Saturn
//Kurt Bangert 1998

#declare r_saturn=1.   //radius of saturn   
#declare r_sr1i = 1.28 //parameters of rings 1,2,3 
#declare r_sr1o = 1.53 //outer and inner radius 
#declare r_sr2i = 1.54
#declare r_sr2o = 1.97
#declare r_sr3i = 2.01
#declare r_sr3o = 2.28  

#declare ringtext1 = pigment { onion
                              color_map {
                              [0.0 color   <1.   ,0.792,0.286>]
                              [0.1 color   <1.   ,0.803,0.278>]
                              [0.13 color  <0.988,0.807,0.286>] 
                              [0.17 color  <1.   ,0.764,0.247>] 
                              [0.2  color  <1.   ,0.737,0.305>]
                              [0.23 color  <0.921,0.670,0.243>]
                              [0.25 color  <0.882,0.631,0.231>]   
                              [0.28 color  <0.898,0.643,0.247>] 
                              [0.3  color  <0.945,0.686,0.270>]
                              [0.38 color  <0.937,0.686,0.270>] 
                              [0.4  color  <0.929,0.674,0.262>]
                              [0.5  color  <0.984,0.733,0.305>]
                              [0.55 color  <0.913,0.666,0.290>]
                              [0.57 color  <0.921,0.674,0.317>]  
                              [0.6  color  <0.858,0.631,0.337>]
                              [0.63 color  <0.780,0.560,0.303>]
                              [0.7  color  <0.729,0.552,0.313>]  
                              [0.88 color  <0.937,0.686,0.270>] 
                              [0.9  color  <0.929,0.674,0.262>]
                              [0.92 color  <0.984,0.733,0.305>]
                              [1.   color  <0.993,0.666,0.290>]
                               }}   
                                          
#declare ringtext2 = pigment { onion
                              color_map {
                              [0.0 color   <0.5  ,0.396,0.143> filter 0.4]
                              [0.1 color   <0.5  ,0.401,0.139> filter 0.4]
                              [0.2  color  <0.5  ,0.365,0.152> filter 0.4]
                              [0.3  color  <0.472,0.343,0.135> filter 0.4]
                              [0.4  color  <0.460,0.354,0.131> filter 0.4]
                              [0.5  color  <0.435,0.365,0.152> filter 0.4]
                              [0.6  color  <0.425,0.315,0.116> filter 0.4]
                              [0.7  color  <0.360,0.275,0.156> filter 0.4]  
                              [0.9  color  <0.460,0.335,0.131> filter 0.4]
                              [1.   color  <0.450,0.333,0.145> filter 0.4]
                               }}   
                              
#declare planettext = pigment { gradient y
                              color_map {
                              [0.0 color   <1.   ,0.792,0.286>]
                              [0.1 color   <1.   ,0.803,0.278>]
                              [0.13 color  <0.988,0.807,0.286>] 
                              [0.17 color  <1.   ,0.764,0.247>] 
                              [0.2  color  <1.   ,0.737,0.305>]
                              [0.23 color  <0.921,0.670,0.243>]
                              [0.25 color  <0.882,0.631,0.231>]   
                              [0.28 color  <0.898,0.643,0.247>] 
                              [0.3  color  <0.945,0.686,0.270>]
                              [0.38 color  <0.937,0.686,0.270>] 
                              [0.4  color  <0.929,0.674,0.262>]
                              [0.5  color  <0.984,0.733,0.305>]
                              [0.55 color  <0.913,0.666,0.290>]
                              [0.57 color  <0.921,0.674,0.317>]  
                              [0.6  color  <0.858,0.631,0.337>]
                              [0.63 color  <0.780,0.560,0.303>]
                              [0.7  color  <0.729,0.552,0.313>]  
                              [0.88 color  <0.937,0.686,0.270>] 
                              [0.9  color  <0.929,0.674,0.262>]
                              [0.92 color  <0.984,0.733,0.305>]
                              [1.   color  <0.993,0.666,0.290>]
                             }}   

#declare saturn = union {

object{sphere{ <0,0,0> r_saturn}
 texture {planettext } }  

object{ disc { <0, 0, 0>,< 0, 1, 0>, r_sr1o, r_sr1i}  
        texture {ringtext2 scale .5 } }  
object{ disc { <0, 0, 0>,< 0, 1, 0>, r_sr2o, r_sr2i}  
        texture {ringtext1 scale .5} }       
object{ disc { <0, 0, 0>,< 0, 1, 0>, r_sr3o, r_sr3i}  
        texture {ringtext1 scale .5} }  
                         }