// clipped conical shape
// cone { <END1>, RADIUS1, <END2>, RADIUS2 [open] }
// Where <END1> and <END2> are vectors defining the x,y,z
// coordinates of the center of each end of the cone
// and RADIUS1 and RADIUS2 are float values for the radii
// of those ends.  open, if present, cone is hollow, else capped
cone
{
  1*y,  0.0,
  -1*y, 1.0
  // open
}