POV-Ray : Documentation : 2.4.6 Constructive Solid Geometry
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2.4.5 Parametric Object Inside and Outside

2.4.6 Constructive Solid Geometry

In addition to all of the primitive shapes POV-Ray supports, you can also combine multiple simple shapes into complex shapes using Constructive Solid Geometry (CSG). There are four basic types of CSG operations: union, intersection, difference, and merge. CSG objects can be composed of primitives or other CSG objects to create more, and more complex shapes.

2.4.5 Parametric Object Inside and Outside

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