See ez3_doc for main facts about EZSCROLL and its graphics.

This EZView reads saved data files with the fields (the records) and
visualizes them instead of actual calculations.

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PARAMETER FILE

The name of parameter files is the only (and optional) argument of
ezview. It defaults to "task.dat". It is similar in style to EZSCROLL
task file, but different in contents.

Line 1: format. A (blank separated) text string. Currently understood: 
  - "ez" the standard ic.dat/fc.dat format as used by EZSCROLL ver. 1.5.
  - "tiff" for tiff-encoded z=const sections named NN.tif (4 channels),
     where NN runs from 0 to nz-1.
  - "ppm" which is 3D extension of binary ppm (3 channels). NB this is not
    proper extension as described in NETPBM manual, as the header is assumed 
    the same for all images and is not repeated, as standard multi-image ppm
    requires. 
Line 2: template. A (blank separated) text string. It should contain a
  C format (with %04d or something like that inside) which would
  produce the name of the file/directory with field record when the
  record number is printed using that format.
Line 3: three numbers (minimal, step, maximal) defining available set
  of records. 
Line 4: grid dimensions
Line 5: simulation and rotation resolutions, as in EZSCROLL. 
Line 6: field shown initilly, as in EZSCROLL
Line 7: the channel in which the "u" variable in the records is to be
  found (0,1 or 22 for ppm and 0,1,2 or 3 for tiff), then its min and
  max expected values (assuming the integer vlues 0..255 have been
  scaled to 0..1 real interval), and the critical values used for
  detecting filaments. NB no check is made on relative values of umin,
  umax and uc etc.
Line 8: same, for the "v" variable. 
Line 9: coloring rule (a number from 0 to 3) and maximal value of the
  opacity (some of coloring rules use gradual variation of opacity).
Line 10: (initial) angular coords defining viewpoint
Line 12: (initial) backs elimination flag
Line 13: (initial) clipping plane flag
Line 14: (initial) filament draw flag
Line 15: (initial) filament write flag
Line 16: (initial) save images flag
Line 17: (initial) write history flag
Line 18: (initial) coordinates of the history point
Line 20: space and time step. They are only used to output
  "dimensional" time and space coords, and do not affect visualization. 
Line 22: verbosity level, as in EZSCROLL. 

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WINDOW TITLE 
is informative: it shows 
- the current field (U, V or N for no field), 
- the current record number ("m=..."),
- its dimensional version ("t=..."),
- direction of "simulation" (-> for forward and <-
  for backward), 
- pause indicator ('*' when paused, place left blank in "simulation"
  mode)
- [....] string indicating current values of the visualization flags,
- [...] string indicating current values of the file output flags,
- (..,..) entry showing curent viewpoint angles.

Visualization flags: 
(B)ack elimination
(C)utting plant
(D)epth sorting
(F)ilament drawing

File output flags:
(H)istory
(I)mages
(W)rite filament data

'Back elimination': when on, the portions of the u-isosurface
corresponding to v-values above the critical (the backs) are not
visualized. This is now done in a crude way (whole triangles are
ignored) so works reasonably well only for good resolution data.


'Images': when on, the contents of visualization window will be saved
automatically to numbered png files at every step when in "simulation
mode".

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HOTKEYS

The flags mentioned above can be changed by pressing "hot keys" while
keyboard focus is in the visualization window. Many correspond to the
hot keys as used EZSCROLL, including 'P' for pause, 'U', 'V' or 'N'
for the field shown.

Further hot keys: 

'S' for Save image: will save just the contents of the current
visualization window into a png file. It is not a flag but an
immediately executed command. It is available in EZSCROLL but the
version here should work on any platform with GL.

'-' : will reverse the value of "step" parameter. You can scroll
through records automatically either forwards and backwards

'=' : will initiate parameter changing dialogue in the parent terminal
window. You will need to change keyboard focus to that window to use
it, and then back to visualization window again when you finished with
it. Hopefully the dialogue should be self-explanatory. Empty answer
for parameter value means do not change, and for parameter name means
finish the dialogue.

For further particulars see the source code.