Keyboard commands apply while cursor is in any graphics window and most
control panels. Most commands allow one of the following selection prefixes
(if none is provided the command applies to the current object):
   g  world geom        g#  #'th geom   g*  All geoms
   c  current camera    c#  #'th camera c*  All cameras
Many allow a numeric prefix:  if none they toggle or reset current value.
Appearance:
 Draw:               Shading:           Other:
  af  Faces             0as Constant     av  eVert normals: always face viewer
  ae  Edges             1as Flat        #aw  Line Width (pixels)
  an  Normals           2as Smooth      #ac  edges Closer than faces(try 5-100)
  ab  Bounding Boxes    3as Smooth, non-lighted  al  Shade lines
  aV  Vectors           aT  allow transparency   at  Texture-mapping
 Color:                 aC  allow concave polygons
  Cf Ce Cn Cb CB   face/edge/normal/bbox/backgnd
Motions:                                      Viewing:
  r rotate         [ Leftmouse=X-Y plane,       0vp Orthographic view
  t translate        Middle=Z axis,             1vp Perspective view
  z zoom FOV         Shift=slow motion,          vd Draw other views' cameras
  f fly              in r/t modes.      ]       #vv field of View
  o orbit           [Left=steer, Middle=speed ] #vn near clip distance
  s scale                                       #vf far clip distance
  w/W recenter/all                               v+ add new camera
  h/H halt/halt all                              vx cursor on/off
  @  select center of motion (e.g. g3@)          vb backfacing poly cull on/off
                                                #vl focal length
  L  Look At object                              v~ Software shading on/off
show Panel:     Pm Pa Pl Po     main/appearance/lighting/obscure
                Pt Pc PC Pf     tools/cameras/Commands/file-browser
                Ps P-           saving/read commands from tty
Lights:  ls le          Show lights / Edit Lights
Metric:  me mh ms       Euclidean Hyperbolic Spherical
Model:   mv mp mc       Virtual Projective Conformal
Other:
  N normalization < Pf  load geom/command file
   0N none        > Ps  save something to file  ui  motion has inertia
   1N each        TV    NTSC mode toggle        uc  constrained (X/Y) motion
   2N all                                       uo  motion in Own coord system
  Rightmouse-doubleclick  pick as current target object
  Shift-Rightmouse        pick interest (center) point
Renderman:
  RR send RIB output to <fileprefix>NNN.rib (default fileprefix == "geom")
  RC Emulate lines using cylinders (default)
  RP Emulate lines using polygons
  Ra choose ASCII RIB format (default)
  Rb choose BINARY RIB format
  Rt choose Display token to specify .tiff file (default)
  Rf choose Display token to specify framebuffer
  Rs Simulate background color with Polygon (default)
  Rx No background simulation - fully transparent (alpha) background