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ginsu(1) Geomview Module ginsu(1)
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 posi-
tion 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!' but-
ton. The old geom is then erased and replaced by two new
geoms. The speed at which this occurs depends on your
machine and the complexity 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 clip-
ping 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).
Nov 4, 1992 1
ginsu(1) Geomview Module ginsu(1)
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
Nov 4, 1992 2