background { color rgb < .2, .7, .5 > }

#declare Plastic =
finish {
  ambient 0.2
  diffuse 0.7
  reflection 0.0
  brilliance 1.0
  phong 0.3
  phong_size 50
  specular 0.0
}

#declare _Threshold = 0.55

#declare H_Atom_Strength = 1.0
#declare C_Atom_Strength = 1.0
#declare O_Atom_Strength = 1.0

#declare H_Atom_Colour = color rgb <0.8, 0.8, 0.8>
#declare C_Atom_Colour = color rgb <0.3, 0.3, 0.3>
#declare O_Atom_Colour = color rgb <0.8, 0.2, 0.2>

#declare A_R_F = 0.68
#declare H_Atom_Radius = A_R_F*1.0
#declare C_Atom_Radius = A_R_F*1.7
#declare O_Atom_Radius = A_R_F*1.52

// hollow glas like vdw surface
//
#declare _F_VDW = 
finish {
    ambient 0
    diffuse 0.02
    reflection 0.04
    refraction 1
    ior 1.003
    phong 0.3
    phong_size 60
}
#declare _T_VDW =
texture {
    pigment { color rgbf <1.0, 1.0, 1.0, 1.0> }
    finish  { _F_VDW }
}

#declare _VDW_Scale = 1.0
#declare C_VDW_Radius = _VDW_Scale*1.7
#declare H_VDW_Radius = _VDW_Scale*1.0

camera{
  location <0,1.25,-7>
  look_at <0, 1.25, 0>
}

light_source { <-8, 20, -12> color rgb < 1, 1, 1 > }
light_source { <0,1.25,-5> color rgb < 0.8, 0.8, 0.8 > }


blob { 
   threshold _Threshold 
   sphere { 
      <-.5, 2.5, 0.> 
      C_Atom_Radius 
      C_Atom_Strength 
      texture { 
         pigment { 
            color 
            C_Atom_Colour 
         } 
         finish { 
            Plastic 
         } 
      } 
   } 
   sphere { 
      <.5, 2.5, 0.> 
      H_Atom_Radius 
      H_Atom_Strength 
      texture { 
         pigment { 
            color 
            H_Atom_Colour 
         } 
         finish { 
            Plastic 
         } 
      } 
   } 
   hollow
} 

union { 
   blob { 
      threshold _Threshold 
      sphere { 
         <-.5, -0., 0.> 
         C_Atom_Radius 
         C_Atom_Strength 
         texture { 
            pigment { 
               color 
               C_Atom_Colour 
            } 
            finish { 
               Plastic 
            } 
         } 
      } 
      sphere { 
         <.5, 0., 0.> 
         H_Atom_Radius 
         H_Atom_Strength 
         texture { 
            pigment { 
               color 
               H_Atom_Colour 
            } 
            finish { 
               Plastic 
            } 
         } 
      } 
      hollow
   } 
   merge { 
      sphere { 
         <-0.5, 0., 0.> 
         C_VDW_Radius 
      } 
      sphere { 
         <0.5, 0., 0.> 
         C_VDW_Radius 
      } 
      texture { _T_VDW } 
      hollow 
   } 
}