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#### Inverse

When using CSG it is often useful to invert an object so that it'll 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.

Finally the `internal_reflections` and `internal_highlights` keywords depend upon the inside/outside status of an object.

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