Hi Guys,
Newbie to the site.
I am trying to render an isosurface but the contained_by container/envelope is
restricted to either a "Box" by default or I can specify a "Sphere".
This all works fine, however I would like to use a spheroid as container and
have been trying to use the boollean union of my object with the "clipped_by"
expression and the spheroid defined by:

clipped_by {sphere{0,1 scale<Rx,Ry,Rz> rotate<0,0,-70> inverse}

where I can defined the RX, Ry & Rz axes dimensions

Unfortunately this always results in a Parse error
with the error occurring immediately after the "Clipped_by" expression

error: Parse Error: Expected "object or directive", threshold found instead

Any guidance would be appreciated
regards

Part of working code:

*************************************************************
#declare saddle=function{1*pow(y,2)- pow(x/1.8,2)+z }

isosurface {
    function { saddle( x,y,z)}
      contained_by {  sphere { <0, 0, 0>, 5} //box {<-3,-2,-10>, <3,2,10>   }
  // clipped_by { sphere{ o, 1 scale<Rx,Ry,Rz> rotate <0,0,-70> inverse} }
              }
  threshold 0
  accuracy .05
  max_gradient 3227
 open
  material {
        texture {
          pigment { color rgbf <0.98, 1.0, 0.99, 0.75> }
          finish { F_Glass4 }
                }
        interior {I_Glass caustics .1}
                }

  rotate <0,0,-70>
            }
******************************************************************

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