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<H2><A ID="SECTION00141000000000000000"> CSG in </A> </H2>
<P> CSG in will generally operate properly when applied to conjunction with on boxes, spheres, tori, and blobs. These primitives are by nature consistent, as they all enclose a portion of space (no hole from the ``inside'' to the ``outside''), have surface normals which point outward (they are not ``inside-out''), and do not have any extraneous surfaces.
<P> CSG objects may also be constructed from aggregate objects. These aggregates contain whatever is listed inside, and may therefore be inconsistent. For example, an object which contains a single triangle will not produce correct results in CSG models, because the triangle does not enclose space. However, a collection of four triangles which form a pyramid does enclose space, and if the triangle normals are oriented correctly, the CSG operators should work correctly on the pyramid.
<P> CSG objects are specified by surrounding the objects upon which to operate, as well as any associated surface-binding commands, by the operator verb on one side and the <TT>end</TT> keyword on the other:
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<P> Note that the current implementation does not support more that two objects in a CSG list (but it is planned for a future version).
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