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NAME
     TranslationSweep -	Routine	to create surfaces of  extrusion.
     RotationSweep - Routine to	create surfaces	of rotation.

SYNOPSIS
     Geom *TranslationSweep(float length, Point3  *p,  Geom  *g);
     Geom  *RotationSweep(float	angle, Point3 *end, Point3 *axis,
		   int divisions, Geom *g);

DESCRIPTION
     TranslationSweep and RotationSweep	are used to create polyl-
     ist  objects  which  are the translational	sweep (surface of
     extrusion)	or rotational sweep (surface of	rotation) of  the
     Geom g, which must	be a vect.

     TranslationSweep takes as	its  arguements	 the  length  and
     direction	of  the	sweep.	The returned off object	will be	a
     representation of the Geom	 g  swept  length  units  in  the
     direction of the vector p.

     RotationSweep forms a surface by rotating the  object  g  by
     angle  units.   The  angle	 parameter should be specified in
     radians.  The rotation is about the axis  specified  by  the
     endpoint  end  and	 in  the  direction axis.  The surface of
     rotation will be divided radially into divisions parts.

     If	angle is within	.01 of 2.0 * pi	(as defined  in	 math.h),
     it	 will be assumed that a	full rotation is desired.  In the
     returned polylist object, the ends	of the sweep  will  refer
     to	 the same points to prevent a crack from appearing due to
     round off error.

     Either routine will print out an error  message  and  return
     NULL  if the Geom g is non-NULL and is not	of the vect type.
     Either routine will return	NULL (with no error message) if	g
     is	NULL.

SEE ALSO
     sweep(1)

AUTHOR
     Celeste Fowler	      email:  fowler@geom.umn.edu
     The Geometry Center      phone:  (612) 626-8304
     1300 South	Second Street
     Minneapolis, MN  55454

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