
File dated 13 Sept 2000

                            3D Graph Lite, update 1

                             Nicklas Larsson, 1998
                              Cln(up) crew, 2000


  This program set is a major upgrade from the last release.

   *  A major algorithm bug has been fixed, where Z3DGCALZ had been
   mixing up the x and y coordinates of matrix [J], which caused problems
   when XGRID and YGRID were not equal.
   *  A math bug, in Z3DGTRCE, caused the wrong X and Y coordinates to be
   printed during Trace mode.  It has been fixed.
   *  The progress reports in the calculation programs have been overhauled
   to reduce redundant messages; the percent-complete indicator has moved
   to the bottom right-hand corner of the screen.
   *  All trig mode-dependent calculations have been removed; the program
   no longer changes the mode to "Degree", and saves and prints the angle
   variables in whatever mode you're currently in.


   *  All "round"s were replaced with "Fix"s or "iPart"s, for no good
   reason.
   *  J and I were switched in Z3DGTRCE, to conform to usages in the other
   programs.
   *  Program ADV3DGRP's menu system has been modified to eliminate a
   couple of "Goto"s.  The Input Xmax and Input Rotation subroutines are
   now above their respective parent "Menu"s, so the control flow is
   uninterrupted (if slightly harder to read).


  Should any of these bugfixes cause problems, please email me with
    the details (contents of Z3DGR, TMP3D, et cetera), and I'll try
    to solve the problem.

  The file 3DGRAPH.PDF is the original documentation (to 3DGRAPH.83G),
    by Larsson, with examples and so forth.  It should all apply to
    this release, with these exceptions:

        *  You do not need to restart ADV3DGRP after drawing the
          graph, or after displaying it; you are returned to the
          main menu.
        *  Trace mode operates differently from the original
          3D Graph.  This version of Z3DGTRCE does not overwrite
          Pic0; instead, a 3x3 box cursor is moved around the
          existing graph.  The cursor leaves blank space when
          it moves around; the graph can be redrawn with DispGraph
          to get rid of the artifacts.
        *  Rotation and Tilt are only expressed in degrees if you
          set your calculator to Degree mode before entering the
          program.  If you set either or both of the angle variables
          in Degree mode, and then switch to Radian mode (or vice
          versa), you must reset the variables because the numbers
          will not have changed.


  This version of the program is NOT supported or endorsed in any
    way by Nicklas Larsson.  Direct comments or suggestions to me
    (arthur_odwyer@yahoo.com).

                                        --Arthur O'Dwyer
                                          (Cln(up) crew)

