NAME:      line_contour2d

AUTHOR:    Kubota Pacific Computer Inc

TYPE:      mapper

INPUT:     field 2D scalar real
           colormap

OUTPUT:    geom

PARAMETERS:

DESCRIPTION:

This looks up equal scalar from 2D irregular field data and writes
contour lines.

A sample network is shown:

                                read field
                                     |
  generate colormap             extract scalar
              |                      |
              |                 orthogonal slicer
              ---------|  |----------|
                     line_cont2d
                         |
                     render manager