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NAME
	vis3 - visualize 3D polygons

SYNOPSIS
	vis3 file
	[ prog ] | vis3

DESCRIPTION
	Vis3 creates a window and then reads rendering commands from
	standard input, or from a file if a filename is specified in
	the first program argument. The view can be rotated using the
	mouse. The coordinate space is -1.0 to 1.0 in each axis.

COMMANDS
	Commands build a scene, which persists until a clearscene command
	is read.

	Statements must be terminated by a semicolon, and a statement may
	span multiple lines.

	The commands are:

	clearscene
		removes all rendering commands from the scene
	color R G B A
		sets a new rendering color; components must be in range
		0.0 to 1.0
	bgcolor R G B A
		sets a new background color; components must be in range
		0.0 to 1.0
	thickness THICKNESS
		sets a new thickness for lines, in pixels
	pointsize SIZE
		sets a new size for points, in pixels
	point X Y Z
		places a point in the scene
	line AX AY AZ  BX BY BZ
		places the line AB in the scene
	poly X Y Z [ X Y Z ... ]
		places in the scene a convex polygon with any number
		of points