The boolean operations will work for all objects but is really
intended for use with solid closed objects with a well defined
interior and exterior region. In the case of open objects the
interior is defined in a rather mathematical way by extending
the boundary faces of the object off into infinity. So results
may be unexpected for these objects. A boolean operation never
affects the original operands, the result is always a new
blender object. Boolean operations are invoked by selecting two
meshes and pressing WKEY. There are three types of boolean
operations to choose from in the popup menu, Intersect, Union
and Difference The boolean operations also take Materials and
UV-Textures into account, producing objects with material
indices or multi UV-mapped objects. Lets consider the object of
Figure 47. The "Intersect" operation creates a new object whose
surface encloses the volume common to both original objects. The
"Union" operation creates a new object whose surface encloses
the volume of both original ob