NAME	ucd cell arrows

SYNOPSIS: Draw Vector Arrows from Cell Centroids for Finite Volume UCD data

Author: Ian Curington, AVS Inc, Staines, UK  < ianc@avs.com >

Type	Mapper

Input	UCD

Output	Geometry

Parameters:
	Name		Type		Choices

	Scale		float		1.0, unbounded

Source	ucd_cell_arrows.c


DESCRIPTION:
  
   This  module draws vectors with arrow heads from UCD input
   showing CELL vector data.
  
   This is a special ucd mapper module designed to make
   representations based on CELL based values rather than
   the more typical NODE based values. If you have CELL based
   values, you should also consider the ucd_cell_to_node module.

   The module will draw both 2D and 3D vectors, as required.

   The Scale dial is simply a length multiplier.
  
This module is intended as a source example for other UCD module
developers.

Restrictions: This relies on AVS version 4.0 or later,
              as READ UCD had cell data bugs in version 3.0.

Related Modules: ucd_to_geom, ucd_contour, ucd_cell_geom

Example Network: ( see ucd_cell_arrows.net )
A data file is included to test the module.

                    READ_UCD  (cell-based vectors)
           ------------|
           |           |
       UCD CELL ARROWS |
           |           |
           |     UCD TO GEOM (edge mode)
           |          |
           |----|     |
              RENDER GEOMETRY
                     |
              DISPLAY PIXMAP