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When using CSG it is often useful to invert an object so that it will be inside-out. The
appearance of the object is not changed, just the way that POV-Ray perceives it. When the inverse keyword
is used the inside of the shape is flipped to become the outside and vice versa. For example:
object { MyObject inverse }
The inside/outside distinction is also important when attaching interior to an
object especially if media is also used. Atmospheric media and fog also do not work
as expected if your camera is inside an object. Using inverse is useful to correct that problem.
More about "CSG"
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