     Keys:
           h:      display this console window on / off
           a:      anim on/off
           f:      fog  on / bg / off
           m:      wire mesh / surface mesh (4 modes)
   >       l:      smooth / facets
   >       t:      texture 1 / 2 / off
   >       SPACE:  generate new terrain
   >       <,>:    subdide less / more
           0:      full screen
   >       1..4:   presets position
   >       i:      display control points
           p:      particules on/off
           P:      next particle type
           c:      clear particules
           C:      clear cells (automata)
           CTRL-p: display position
           L:      display-list on/off (faster)
     Mouse:
           LEFT: rot camera  MIDDLE,RIGHT: move camera (RIGHT=zoom)
           SHIFT-LEFT,SHIFT-MIDDLE,SHIFT-RIGHT: rotate objet
           CTRL-LEFT: rot light
           CTRL-RIGHT: terrain roughness
           CTRL-MIDDLE:  sea level
           CTRL-SHIFT-LEFT: start fire automata
           CTRL-SHIFT-MIDDLE: start water particles
           CTRL-SHIFT-RIGHT:  move control points (see 'i')
           f-LEFT:     tune fog density
           r-LEFT:     tune source diameter
           v-LEFT:     tune source velocity