geometry DEF surface NurbsSurface {
          uOrder 4 
          vOrder 3 
          uDimension 7 
          vDimension 3 
          uTessellation 100  ## needed
          vTessellation 60
          controlPoint [ 
       0.5 -5 0, 1 0.5 0, 2 2.5 0, 3 4.2 0, 4 4 0, 5.2 3.5 0, 5.3 0 0,
       0.5 -5 0, 1 -2 0, 2 0 0, 3 0 0, 4 0 0, 5.2 0 0, 5.3 0 0,
       0.5 -5 0, 1 -0.5 0, 2 -3.0 0, 3 -4.2 0, 4 -4.0 0, 5.2 -3.5 0, 5.3 0 0,
       ]
          }
     appearance USE MAT
  
  } ## end shape
  ] } ##local transform
  
  ] } ## end 1 (left)
  
  ] } ## end switch
  ] }
  
  ] } ## end billboard
  
  } ## end bulb proto