Generally, is there a built-in feature in POV Ray to create a solid 
object from sweeping an existing solid object along a path?

If not, is it at least possible to sweep it along a straight line?

If still not possible, maybe my special case is possible some other way. 
I actually want to extrude a planar sphere-sweep. So supopose I have a 
spline on the y plane, and I use sphere-sweep to turn this into a tube 
lying on the y plane. Now I want to turn that tube into a "sheet" with 
round edges by extruding it along the y axis. Is this possible?

Perhaps is there a way to construct an equivalent shape by using 
something other than sphere-sweep?

Thanks
Timwi

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