#include "colors.inc"
#include "textures.inc"

background{color Gray60}
/*
Steiners Cross Cap
4*x^2*(x^2+y^2+z^2+z)+y^2*(y^2+z^2-1)=0
*/
poly { 4<

4., 0, 0, 0, 4., 0, 0, 4., 4., 0, 0, 0, 0, 0, 0, 0, 
 
 0, 0, 0, 0, 1., 0, 0, 1., 0, -1., 0, 0, 0, 0, 0, 0, 
 
 0, 0, 0
>
   




   scale < 4,4,4>
   texture {
      pigment {checker color Gray60,Red }
      finish {
	 phong 0.30
	 phong_size 60
	 ambient 0.4
	 diffuse 0.4
         reflection 0.2    
}
scale 0.5
      
   }
//clipped_by{sphere{<0,0,0>50}}
rotate<0,180,0>
}
/*
// Put down  
plane {
   y, -5.0
   texture {
      pigment {
          color Gray40 
         
      }
      finish {
	 ambient 0.0
	 diffuse 0.4
      }
   }

}
*/
camera {
   location  <6.2, 1.3, -8.5>
   up        <0.0, 1.0,  0.0>
   right     <4/3, 0.0,  0.0>
   look_at   <0.1, 0.1,  0.1>
}

light_source { <200,500,-100> White
    spotlight
    radius  4
    falloff 6
    point_at <0,0,0>
}


light_source { <1000, 300, -1301> color White }

light_source { <-101, -41, -131> color White }