crayola man page on IRIX

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     crayola(1)	    Geometry Center (January 12, 1993)	    crayola(1)

     NAME
	  crayola - Geomview external module to color OOGL objects.

     SYNOPSIS
	  crayola

     DESCRIPTION
	  Crayola is a Geomview external module used to interactively
	  color OOGL objects.  Crayola should appear in Geomview's
	  external module browser automatically after it has been
	  properly installed.  If this does not happen, add the line

     (emodule-define Crayola crayola)
	  to your .geomview file (for more details, see geomview(5)).
	  Click on Crayola in the browser to start the program.

	  The buttons at the top of the Crayola main panel state the
	  mode that the program is in.	It begins in "Get" mode,
	  meaning that picking an object in Geomview (by moving the
	  cursor over the object in the camera window and pressing the
	  right mouse button) will adjust the colorwheel to show the
	  color of the object at the chosen location.  In the Silicon
	  Graphics Iris version, the colorwheel is located on the main
	  panel.  Click with the mouse to move the black dot around
	  and change the color selection.  The "Intensity" slider is
	  used to make the colors darker or lighter.  The slider
	  starts set to the far left, or full intensity.  Moving the
	  slider to the right will decrease the intensity, until, at
	  the far right, the color wheel is entirely black.  The
	  second slider, marked "Opacity," will be discussed later.
	  In the NeXT version, the color picker panel will pop up
	  seperately (The color picker may be set to use a different
	  color selection mode than the colorwheel).

	  Colors may be assigned to parts of an OOGL object by
	  clicking the "Set" button on the Crayola main panel and
	  picking the object in the Geomview camera window.  The
	  object may not already have color information; if this is
	  the case a panel will pop up asking if you want to add color
	  information to the object.  Clicking on "Yes" will modify
	  the object to include color information.

	  Each OOGL object has a slightly different scheme for
	  representing color.  For example, quads are colored by
	  vertex, while polylists may be colored by face or by vertex
	  and Bezier patches are colored by patch corner.  See oogl(5)
	  for a detailed discussion of which object uses which
	  coloring scheme.  Generally, in Crayola, clicking on a face
	  will color that entire face with the given color, either by
	  changed the color assigned to the face or by changed the
	  color assigned to each of the vertices of the face.  If
	  per-vertex coloring is being used, the colors of the

     Page 1					    (printed 12/22/98)

     crayola(1)	    Geometry Center (January 12, 1993)	    crayola(1)

	  vertices may be changed individually by clicking on them.

	  An entire object may be colored by clicking the "Set All"
	  button and picking it in Geomview.

	  Color information may be removed from an object by clicking
	  the "Eliminate Color" button and picking on the object in
	  Geomview.

	  Crayola remembers the last change you made to the object, so
	  clicking on the "Undo" button will get rid of minor
	  mistakes.  Note that ONLY the last change is remembered.

	  Crayola has the ability to assign colors containing opacity
	  information (alpha values) to Geomview objects.  However,
	  transparent objects are supported only on some computers (eg
	  Iris GTX's, VGX's, Crimsons, and high-end Indigos).  The
	  opacity of the current color may be modified by moving the
	  opacity slider (on the main panel on SGI's and the color
	  picker panel on NeXT's).  On Silicon Graphics computers
	  supporting transparency, the colorwheel will fade in and out
	  as the slider is moved back and forth.  On NeXTs, the upper
	  right portion of the color in the color well will become
	  lighter.  If the opacity slider is in a position other than
	  to the far right, the current color is partially
	  transparent.	This information will be assigned to the
	  object along with all the other color information.  In order
	  for the given color to look transparent in Geomview,
	  transparency must be explicitely turned on in Geomview (see
	  Geomview(5) for details on how to do this).

     SEE ALSO
	  geomview(1), geomview(5), oogl(5)

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

     Page 2					    (printed 12/22/98)

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