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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, mean-
     ing 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 Graph-
     ics 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  click-
     ing  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	 informa-
     tion  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 ver-
     tex, 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
     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 mis-
     takes.  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 sup-
     porting 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 tran-
     sparent.  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,  tran-
     sparency  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:  [email protected]
     The Geometry Center	     phone:  (612) 626-8304
     1300 South	Second Street
     Minneapolis, MN  55454

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