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The clipped_by statement is technically an object modifier but it provides a type of CSG similar to CSG intersection. The syntax is:
clipped_by { UNTEXTURED_SOLID_OBJECT... } | clipped_by { bounded_by }
Where UNTEXTURED_SOLID_OBJECT is one or more solid objects which have had no texture applied. For example:
object {
My_Thing
clipped_by{plane{y,0}}
}
Every part of the object My_Thing that is inside the plane is retained while the remaining part is clipped off and discarded. In an intersection object the hole is closed off. With clipped_by it leaves an opening. For example the following figure shows object A being clipped by object B.

An object clipped by another object.
You may use clipped_by to slice off portions of any shape. In many cases it will also result in faster rendering times than other methods of altering a shape. Occasionally you will want to use the clipped_by and bounded_by options with the same object. The following shortcut saves typing and uses less memory.
object {
My_Thing
bounded_by { box { <0,0,0>, <1,1,1> } }
clipped_by { bounded_by }
}
This tells POV-Ray to use the same box as a clip that was used as a bounds.
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