NAME:			ambient
 
 CELL CONTENTS:
 	Each cell contains two facets.  Neither facet contains
 	per-vertex or per-facet attributes.  Both facets are at the 
 	same Z value.  HLHS_removal is always disabled.  The two facets
 	overlay.  The upper left of these facets occludes the lower
 	right one.  The upper left facet is front facing while the
 	lower right one is backfacing.  Within a cell all attributes 
 	are constant, however some attributes will effect the
 	frontfacing facet and others will effect the backfacing facet.
 
 	Of the 14 variations of this test the output primitive used 
 	to create the facet is:
 
|	(ambient.v01 - ambient.v02) use "Polygon" as the facets.
|	(ambient.v03 - ambient.v04) use "Polygon3" as the facets.
|	(ambient.v05 - ambient.v06) use "Fill_area_set" as the facets.
|	(ambient.v07 - ambient.v08) use "Fill_area_set3" as the facets.
|	(ambient.v09 - ambient.v10) use "Triangle3" as the facets.
|	(ambient.v11 - ambient.v12) use "Quad_mesh3" as the facets.
|	(ambient.v13 - ambient.v14) use "Index_polygon3" as the facets.
|	(ambient.v15 - ambient.v16) use "Non_uniform_bspline_surface" as the facets.
 
 CELL LAYOUT:
 	Cells are arranged on the screen in a matrix of 3 rows and
 	4 columns.
 
 CONSTANTS:
 	Background_color   		.3 .3 .8
 	Interior_style 			solid
 	Interior_color 			1.0 1.0 1.0
 	Backface_interior_color 	1.0 1.0 1.0
 	Interior_lighting 		2  (ambient)
 	HLHS_Removal			hlhs_disable
 	Edge_flag 			enable
 	Edge_type 			0
 	Edge_color 			1.0 0.8 0.6
 	Text_prec			Stroke
 	Char_exp			1
 	Char_height			30
 	Text_color			1 1 1
 
   	Surface_properties
 	    % Ambient reflection coefficient    % VARIABLE
 	    % Diffuse reflection coefficient    % 0.00
 	    % Specular reflection coefficient   % 0.00
 	    % Specularity true-color components % 0.0 0.0 0.0
 	    % Specular exponent                 % 0.0
 	    % Transparency coefficient          % 1.0
 
   	Backface_properties
 	    % Ambient reflection coefficient    % VARIABLE
 	    % Diffuse reflection coefficient    % 0.00
 	    % Specular reflection coefficient   % 0.00
 	    % Specularity true-color components % 0.0 0.0 0.0
 	    % Specular exponent                 % 0.0
 	    % Transparency coefficient          % 1.0
 
     Define_light
       % Index in light source table   % 1
       % Light source color components % 1.0   1.0   1.0
       % Non-directional light source  % Ambient_light
      ; 
     Define_light
       % Index in light source table   % 2
       % Light source color components % 1.0   0.66  0.66
       % Non-directional light source  % Ambient_light
      ; 
     Define_light
       % Index in light source table   % 3
       % Light source color components % 1.0   0.33  0.33
       % Non-directional light source  % Ambient_light
      ; 
     Define_light
       % Index in light source table   % 4
       % Light source color components % 1.0   0.0   0.0
       % Non-directional light source  % Ambient_light
      ; 
 
 PER FILE VARIABLES:
 	Default_view_specification	parallel/perspective
 
 COLUMN VARIABLES:
 				Column
 			1	    2		3	    4
   Variable:  		____	    ____	____	    ____
   Interior_shading	1(FLAT)	    2(GOURAUD)	3(DOT)	    4(PHONG)
     (should have no effect)
   Call/Execute		Exec	    Call	Exec	    Call
 
 
 	
 ROW VARIABLES:	Backface_processing
 		identify_backface
 
   1		1 (BACKFACE_IDENTIFY)
   2		2 (BACKFACE_IGNORE  )
   3		1 (BACKFACE_IDENTIFY)
 
 
 ROW/COLUMN VARING VARIABLES:
 
   Backface_processing: iculling
 		Column 1:    Cloumn 2:   Column 3:   Column 4:
   Row 1:	0	     0		 0	     0
   Row 2:	1	     2		 0	     1 (should have)
   Row 3:	0	     0		 0	     0 (no effect)
 
   Surface_properties: Ambient reflection coeficient 
 		Column 1:    Cloumn 2:   Column 3:   Column 4:
   Row 1:	0.00	     0.25	 0.75	     1.00
   Row 2:	0.00	     0.25	 0.75	     1.00
   Row 3:	1.00	     1.00	 1.00	     1.00
 
   Backface_properties: Ambient reflection coeficient 
 		Column 1:    Cloumn 2:   Column 3:   Column 4:
   Row 1:	1.00	     0.75	0.25	     0.00
   Row 2:	1.00	     0.75	0.25	     0.00
   Row 3:	0.50	     0.50	0.50	     0.50
 
   Light_state:  Active light
 		Column 1:    Cloumn 2:   Column 3:   Column 4:
   Row 1:	1	     1		 1	     1
   Row 2:	1	     1		 1	     1
   Row 3:	4	     3		 2	     1
 
 
 COMMENTS ON PHOTOGRAPHS:
 
 	*  Backface processing is being ignored in the photographs.
 		What you should see is depicted below:
 
   ________        ________        ________        ________      
   |       |____   |       |____   |       |____   |       |____ 
   |   0   |    |  |   1   |    |  |   2   |    |  |   3   |    |
   |       | 3  |  |       | 2  |  |       | 1  |  |       | 0  |
   |_______|    |  |_______|    |  |_______|    |  |_______|    |
        |_______|       |_______|       |_______|       |_______|
   ________        ________        ________        ________      
   |       |____   |       |____   |       |____   |       |____ 
   |   0   |    |  |   1   |    |  |   2   |    |  |   3   |    |
   |       | 0  |  |       | 1  |  |       | 2  |  |       | 3  |
   |_______|    |  |_______|    |  |_______|    |  |_______|    |
        |_______|       |_______|       |_______|       |_______|
   ________        ________        ________        ________      
   |       |____   |       |____   |       |____   |       |____ 
   |  R1   |    |  |  R2   |    |  |  R3   |    |  |   3   |    |
   |       |R1.5|  |       |R2.5|  |       |R3.5|  |       |R4.5|
   |_______|    |  |_______|    |  |_______|    |  |_______|    |
        |_______|       |_______|       |_______|       |_______|
       
   
 	Were the number indicates the color of the facet:
 
 		index	red	green	blue
 		-----	-----	-----	-----
 		0	0.00	0.00	0.00
 		1	0.25	0.25	0.25
 		2	0.50	0.50	0.50
 		3	1.00	1.00	1.00
 
 		R1	1.00	0.00	0.00
 		R2	1.00	0.33	0.33
 		R3	1.00	0.66	0.66
 
 		R1.5	0.50	0.00	0.00
 		R2.5	0.50	0.16	0.16
 		R3.5	0.50	0.33	0.33
 		R4.5	0.50	0.50	0.50
 
 	*  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.

.