usage: pp3d [-hm]

Displays animations of three dimensional particle motion

   Flags: -h   help
          -m   monochrome

-----------------------------------------------------------------------------
pp3d expects the following formatted input on standard input:
-----------------------------------------------------------------------------

       <np>                          ! Number of particles
       <size_1>                      ! Relative display size of particle 1
       <size_2>                      ! Relative display size of particle 2
                   .
                   .
                   .
       <size_np>                     ! Relative display size of particle np
       <t_1>                         ! First display time
       <x_1_1>  <y_1_1>  <z_1_1>     ! Coordinates of particle 1 at t_1
       <x_1_2>  <y_1_2>  <z_1_2>     ! Coordinates of particle 2 at t_1
                   .
                   .
                   .
       <x_1_np> <y_1_np> <z_1_np>    ! Coordinates of particle np at t_1
       <t_2>                         ! Second display time
       <x_2_1>  <y_2_1>  <z_2_1>     ! Coordinates of particle 1 at t_2
       <x_2_2>  <y_2_2>  <z_2_2>     ! Coordinates of particle 2 at t_2
                   .
                   .
                   .
       <x_2_np> <y_2_np> <z_2_np>    ! Coordinates of particle np at t_2
       <t_3>                         ! Third display time
                   .
                   .
                   .

  All values are expected to be real numbers except for <np> which is
  an integer.

-----------------------------------------------------------------------------
pp3d keyboard assigments (commands are case-insensitive):
-----------------------------------------------------------------------------

  ESC:               Exit program
  p:                 Pause/continue animation

  z:                 Zoom-in on solution domain
  x:                 Zoom-out on solution domain

  a:                 Enlarge marker size
  s:                 Reduce marker size

  q:                 Enlarge window size
  w:                 Reduce window size

  t:                 Start/stop tumbling

  y:                 Increase tumbling rate

  r:                 Decrease tumbling rate

  o:                 Toggle visibility of origin

-----------------------------------------------------------------------------
Miscellaneous
-----------------------------------------------------------------------------

The initial (default) viewing region is:
   -1 <= x <= 1
   -1 <= y <= 1
   -5 <= z <= 5

The base marker size is 5 pixels
Markers can range from 3 to 20 pixels in size