NAME:       print upstream geom

TYPE:       renderer

AUTHOR:     Ian Curington, Stardent Computer Ltd., UK

INPUTS:     struct upstream geom

OUTPUTS:    none

PARAMETERS: text block (used as output)

DESCRIPTION:

  This is a diagnostic tool, used to show the contents of
  "upstream geom" data types, sent upstream for interactive
  control in AVS3.

  It uses "user defined data types".

The AVS flow executive has a special case for effiently handling 
upstream flow. The print modules do not send anything
to the geometry viewer, and are hand-wired in afterwards,
so the flow exec bypasses them.

1. Have your probe and other upstream modules run at least once,
   so you know valid data is sitting at the GeomViewer output ports.

2. Get the print module to run, by tweeking a parameter (or add a
  one-shot "look" button, just to get it to fire. Or use the
  CLI to fire it, or make some port that you wire from an upstream
  module, like probe, so probe will fire the print module.