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<H1><A ID="SECTION00740000000000000000">
Constructive Solid Geometry</A>
</H1>
<P>
Constructive Solid Geometry is
the process of building solid objects from other solids.
The three CSG
operators are Union, Intersection, and Difference. Each operator
acts upon two objects and produces a single object result.
By combining multiple levels of CSG operators, complex
objects can be produced from simple primitives.
<P>
The union of two objects results in an
object that encloses the space occupied by the two given objects.
Intersection results in an object that encloses the space where the two
given objects overlap. Difference is an order dependent operator; it
results in the
first given object minus the space where the second intersected
the first.
<P>