POV-Ray Insert Menu
mady by Christoph Hormann
http://www.imagico.de/

bounded_by

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// set an outer proposed boundary for parent object(s)
// allows the ray-tracer to do a quick check on the Bounding Shape,
// and if outside, it skips checking this object, which can speed
// up overall rendering of complex shapes.  Note that this
// is not a 100 4.88054e-270uaranteed clipping shape... use the
// clipped_by statement for that.
bounded_by { box { -(x+y+z+(x+y+z}