NAME:		generate grid

AUTHOR INFO:	Larry Gelberg, Stardent Computer, 508-287-0100

SOURCE FILE:	gen_grid.c

TYPE:		data

INPUTS:		OPTIONAL: field 2d uniform 4-vector byte

OUTPUTS:	field 2d uniform 4-vector byte

PARAMETERS:     Name		Type	Default		Min	Max 	Choices
		Foreground Hue	float	0.67		0.0	1.0
		Foreground Sat	float	0.00		0.0	1.0
		Foreground Value float	1.00		0.0	1.0
		Background Hue	float	0.67		0.0	1.0
		Background Sat	float	0.00		0.0	1.0
		Background Value float	1.00		0.0	1.0
		Grid Width	int	1		0	10
		Grid Spacing	int	10		0	100
		X Resolution	int	128	        1      1024
		Y Resolution	int	128	        1      1024

DESCRIPTION:
	GENERATE GRID creates a colored image of a grid of one color
superimposed over a background color. You can control the colors of
the grid with the FOREGROUND HUE, SAT(uration), and VALUE dials, the
color of the background with the BACKGROUND HUE, SAT(uration), and
VALUE dials, the thickness of the grid lines with the GRID WIDTH dial,
the size of the squares between the grid lines with the GRID SPACING
dial, and the resolution of the output image with the RESOLUTION
typeins.

	If an image is plugged into the optional input port, then
GENERATE GRID will produce an image of identical size. This is useful
for compositing operations.

EXAMPLE NETWORK 1:
	To make a picture of a grid:

	     GENERATE GRID
        	  |
	     DISPLAY IMAGE

EXAMPLE NETWORK 2:
	To composite an image over the grid:

                               READ IMAGE
               _____________________|
               |                    |
	GENERATE GRID		    |
	       |________     _______|
		       |     |
		      COMPOSITE
                          |
		    DISPLAY IMAGE

SEE ALSO: BACKGROUND, COMPOSITE modules