NAME:			depthcue
 
 CELL CONTENTS:
 	Each facet is constructed in the z=0 plane to the dimensions
 	shown below.  HLHS_Removal is enabled when this cell is drawn
 	in the first column (see CELL LAYOUT), and disabled when this
 	cell is drawn in the second column.  HLHS_Removal is then 
 	disabled and the line and text information is also constructed
 	in the z=0 plane.  This should cause them to be drawn on top 
 	of the facet with no z-buffer bleeding.  This cell is then 
 	scaled and translated into the correct position as described 
 	in CELL LAYOUT.  
  
         HLHS_Removal hlhs_disable ;
 
 	     -0.75x (begining of text and text3)
 	     |
 	     |
 	____________________________    ____ +1 y  (top of facet)
 	|\                         /|
 	|  \                     /  |   ____ +0.9y (top of text3)
 	|    \                 /    |
 	|      \             /      |
 	|        \         /        |
 	|     This is a text3       |   ____ +0.1y (bottom of text3)
 	|            \ /            |
 	|            / \            |   ____ -0.1y (top of text)
 	|          /     \          |
 	|        /         \        |
 	|      /             \      |
 	|    /                 \    |
 	|  /  This is a text     \  |   ____ -0.9y (bottom of text)
 	|/_________________________\|   ____ -1 y  (bottom of facet)
 
 	|			    |
 	|			    |
 	-1 x			    +1 x
 
 
 CELL LAYOUT:
 	Cells are arranged on the screen in two diagonal columns.  Each
 	column consists of 7 rows.  The primitive used to construct the
 	facet for each cell is listed below.  The cells in column 1
 	should appear to be depthcued correctly while the cells in
 	column 2 should appear to be depthcued backwards (this is because
 	HLHS_Removal is always disabled for this column.  Note that
 	perspective will also look funny for this column for the same
 	reason.  The cell in Column 1 Row 1 is the nearest.  The cell
 	in Column 2 Row 1 is the most distant.).
 
 
   Column 1                                      Column 2
 
   ________                                      ________ 
   |       |                                     |       |
   |       |                                     |       |
   |       |__                                ___|       |     : Row 1
   |_______|  |                               |  |_______|
      |       |                               |       |
      |       |__                          ___|       |        : Row 2
      |_______|  |                         |  |_______|
         |       |                         |       |
         |       |__                    ___|       |           : Row 3
         |_______|  |                   |  |_______|
            |       |                   |       |
            |       |__              ___|       |              : Row 4
            |_______|  |             |  |_______|
               |       |             |       |
               |       |__        ___|       |                 : Row 5
               |_______|  |       |  |_______|
                  |       |       |       |
                  |       |__  ___|       |                    : Row 6
                  |_______|  | |  |_______|
                     |       | |       |
                     |       | |       |                       : Row 7
                     |_______| |_______|
 
 
 	Column 1 row 1:	uses "Polygon"         as the facets  z =    0.
 	Column 1 row 2:	uses "Polygon3"        as the facets  z =  -50.
 	Column 1 row 3:	uses "Fill_area_set"   as the facets  z = -100.
 	Column 1 row 4:	uses "Fill_area_set3"  as the facets  z = -150.
 	Column 1 row 5:	uses "Triangle3"       as the facets  z = -200.
 	Column 1 row 6:	uses "Quad_mesh3"      as the facets  z = -250.
 	Column 1 row 7:	uses "Index_polygon3"  as the facets  z = -300.
 
 	Column 1 row 7:	uses "Polygon"         as the facets  z = -350.
 	Column 1 row 6:	uses "Polygon3"        as the facets  z = -400.
 	Column 1 row 5:	uses "Fill_area_set"   as the facets  z = -450.
 	Column 1 row 4:	uses "Fill_area_set3"  as the facets  z = -500.
 	Column 1 row 3:	uses "Triangle3"       as the facets  z = -550.
 	Column 1 row 2:	uses "Quad_mesh3"      as the facets  z = -600.
 	Column 1 row 1:	uses "Index_polygon3"  as the facets  z = -650.
 
 CONSTANTS:
     	Background_color   .1 .1 .3 
 	Interior_style solid 
 	Interior_color 			1 1 1 
 	Backface_interior_color 	1 1 1 
 	Interior_lighting 		0 
 	Backface_processing 		0 0 	
 	Edge_flag 			enable 
 	Edge_color 			1 0 0 
     	Define_depthcue 
 					1 Enable 
 					{
     						0.5  0.825 
     		 				1  0
     						.1 .1 .3 
 					}
 	Depthcue_index 			1 
 
 	Text_prec 			Stroke 
 	Char_exp 			0.166 
 	Text_color 			1 0 0 
 	Line_color 			0 0 0
 	char_height 			.80 
 	
 PER FILE VARIABLES:
 	Default_view_specification	parallel/perspective
 
 RANDOM VARIABLES:
 	NONE
 
 COLUMN VARIABLES:
 				Column
 			1			2
   Variable:  		____			____
   HLHS_Removal 	hlhs_enable		hlhs_disable
 	
 ROW VARIABLES:
 	NONE
 
 ROW/COLUMN VARYING VARIABLES:
 	NONE
 
 COMMENTS ON PHOTOGRAPHS:
 
 	*  Depthcue is malfunctioning in the photographs.
 		Column 1 Row 1 should have a white facet, black
 		lines, and red text.  This should fade toward the
 		background color until Column 2 Row 1 is all in
 		the background color and cannot be seen.
 
 	*  Text is not being displayed.  See CELL CONTENTS for a
 		description of the text.
 
 	*  The text size (for the text at toe bottom of the screen )
 		was reduced from the size on the photograph.  Additional
 		information has been added to that text.

.