NAME scatter_ribbon - draw geometric ribbon from scatter data

 AUTHOR   Ian Curington, Advanced Visual Systems, Inc.

 INPUT    field 1D irregular float n-vector (scatter)
          colormap  (optional)

 OUTPUT   geometry of ribbon

 PARAMETERS
       scale     - relative ribbon width
       Angle     - 3D angle away from Z-axis
       Width Low - lowest data value to map to ribbon width
       Width High- highest data value to map to ribbon width
       mode      - No color, checker colors, scalar colors
       Uniform   - fixed width ribbon
       Block     - solid fill each block, stair-step edge
       Color_Vector    - which scalar to map to ribbon color
       Width_Vector    - which scalar to map to ribbon width
       tic_interval,   - how often to draw tick marks
       label_interval, - how often to draw labels
       draw_tics,      - on/off control
       draw_labels,     - on/off control
  
  

 DESCRIPTION

   This module may be used for 3D Well Log data display,
   showing various properties down a deviated well shaft.
   If your vector data is 1D n-vector float irregular,
   this module will draw a ribbon going along the side of
   the polyline path, from joining up the specified positions
   in the scatter field coord array.
   The width, and color of the ribbon can be
   controlled to create a ribbon data representation.
   Tick marks and labels will annotate the graph.
   Interpolation can be turned on and off.