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NAME
     ginsu - interactively slice geoms

SYNOPSIS
     ginsu

DESCRIPTION
     Ginsu is an interactive slicing tool  designed  to	 be  used
     with  Geomview.   It allows the user to move around a square
     slicing plane to an arbitrary position and	then to	 slice	a
     particular	 geom  with that plane.	Slicing	involves dividing
     the geom into two seperate	geoms at the plane  of	cleavage.
     Once  slicing  has	been performed,	each of	the two	new geoms
     created can be moved around and examined independently  from
     the other.	Ginsu runs only	on Silicon Graphics machines.

     Ginsu works by constantly querying	geomview for the position
     of	 the plane as one moves	it and then updating the internal
     plane equation it uses. The coefficients  of  this	 equation
     appear  on	 the  main panel for examination.  When	the plane
     has been properly positioned, one enters  the  name  of  the
     geom  that	 one  wishes to	slice in the 'Target Clip Object'
     text window, then clicks on the  'Slice!'	button.	 The  old
     geom is then erased and replaced by two new geoms.	The speed
     at	which this occurs depends on your machine  and	the  com-
     plexity of	the geom.

     In	some cases one may want	to  manually  enter  the  coeffi-
     cients  of	 the  slicing  plane. This can be accomplished by
     toggling on the 'Edit' button. Ginsu is now in edit mode and
     will no longer update the coefficients if the plane is moved
     about inside  Geomview.  To  change  coefficients	now,  one
     clicks  in	 each  coefficient  text  box  and types in a new
     number followed by	enter. The  plane  will	 be  repositioned
     each time to match	the new	set of coefficients. Toggling the
     'Edit' button off will put	us back	in interactive mode.

     Some things to keep in mind: Ginsu	turns  normalization  off
     when  it  is  run and prevents it from being turned back on.
     This  is  because	keeping	 normalization	can   have   some
     unpleasant	effects	when cutting things. Ginsu depends on the
     clipping plane being  present.  If	 the  clipping	plane  is
     somehow deleted, Ginsu is then forced to exit.

BUGS
     Sometimes color or	normal information is lost when	 clipping
     certain geoms.  This is because ginsu always converts a geom
     to	an OFF format geom before clipping it. When clipping  the
     "World"  geom,  everything	in the world becomes consolidated
     into two geoms (this could	 actually  be  thought	of  as	a
     feature).

SEE ALSO
     geomview(1) oogl(5)

AUTHOR
     Daeron Meyer	      email: daeron@geom.umn.edu
     The Geometry Center      phone: (612) 626-8302
     1300 South	Second Street
     Minneapolis, MN 55454

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