NAME:		contour to geom

AUTHOR INFO:	Anonymous, Stardent Computer, 617-964-1000

SOURCE FILE:	contour2.c

TYPE:		mapper

INPUTS:		field scalar byte

OUTPUTS:	geom (disjoint lines)

PARAMETERS:     Name		Type	Default		Min	Max
		threshold	int	128		0	255

DESCRIPTION:
	CONTOUR TO GEOM finds and creates contour lines of similar value in a
scalar byte field. The parameter "threshold" controls the level of contour
being found. It differs from the CONTOUR module found in the user_modules/filters
directory in that it produces disjoint lines which can be rendered with the 
geometry viewer. It can also handle 3D data sets and irregular grids.

EXAMPLE 1: This network finds a contour on the red channel of the mandrill
image:

(this network is on-line as image_contour.net)

        READ IMAGE
            |
      EXTRACT SCALAR     (set to 1)
            |
      CONTOUR TO GEOM
            |
      RENDER MANAGER


EXAMPLE 2: This network finds the magnitude of the vector.fld vector field and 
contours it:

(this network is on-line as volume_contour.net)

		      READ FIELD	
	     ______________|____________
	     |			       |
        VECTOR MAG		       |
	     |  		       |
       FIELD TO BYTE		       |
	     |			       |
      CONTOUR TO GEOM		       |
	     |_________________________|
		           |
 		     RENDER MANAGER


SEE ALSO: EXTRACT SCALAR, CONTOUR