NAME

       aven - sophisticated cave viewer for Unix and MS Windows

SYNOPSIS

       aven [ --survey=SURVEY ] [ --print ] .3d file

DESCRIPTION

       Aven displays processed cave surveys in a window and allows you to manipulate the view.

       Note that there is no perspective in the view. This means that it is impossible to tell which way round a
       cave is rotating, or whether you are viewing something from behind, or in front.  So  if  you  think  the
       direction  of  rotation  in wrong, or changes as you watch, this is just your brain being confused, not a
       bug!

   MOUSE CONTROL
       The best way to move the cave is with the mouse.  We suggest you try each of these out after reading this
       section to get a feel for how they work.

       If you hold down the right button then the cave is dragged when you move the mouse.

       If  you  hold down the left button, then the cave is rotated if you move left or right, and zoomed if you
       move up and down.  If you hold down Ctrl while dragging with the left mouse button, then the cave rotates
       and tilts at the same time instead.

       If  your  mouse has a middle button then holding it down and moving the mouse up and down tilts the cave.
       Moving the mouse left and right has no effect.

       And if you have a scrollwheel, this can be used to zoom in/out.

       By default the mouse moves the cave, but if you press Ctrl-R, then the  mouse  will  move  the  viewpoint
       instead  (i.e.  everything will go in the opposite direction). Apparently this feels more natural to some
       people.

   KEYBOARD CONTROL
       P and L select Plan and eLevation respectively.  Changing between plan to elevation is animated  to  help
       you see where you are and how things relate. This animation is automatically disabled on slow machines to
       avoid user frustration.

       Comma ', and Slash / tilt up and down respectively. Tilt goes 180 degrees from plan view to a  view  from
       directly below (upside down plan).

       Space  toggles  automatic rotation about a vertical axis on and off.  The speed of rotation for this, and
       animated transitions between plan and elevation, is controlled by Z and X.

       Crosses and/or labels can be displayed at survey stations.  Ctrl-X toggles  crosses  and  Ctrl-N  station
       names.  Ctrl-L toggles the display of survey legs.

       Delete  is  useful  if you get lost - it resets the scale, position, and rotation speed, so that the cave
       returns to the centre of the screen. There are also keyboard controls to use instead of the mouse - Shift
       helps here as it accelerates all movements:

       Z, X : Faster/Slower Rotation
       R: Reverse direction of rotation
       Enter, Space: Start and stop auto-rotation
       Ctrl-Cursor Left, Ctrl-Cursor Right: Rotate cave one step clockwise/anti-clockwise (also: C, V)
       Ctrl-Cursor Up , Ctrl-Cursor Down: Higher/Lower Viewpoint (also: ' , /)
       ] , [: Zoom in/Out
       U, D: Set view to Up/Down
       N, S, E, W: Set view to North, South, East, West
       Delete: Reset to default scale, rotation rate, etc
       P, L: Plan, Elevation
       Cursor Left, Cursor Right: Pan survey Left/Right (on screen)
       Cursor Up, Cursor Down: Pan survey Up/Down (on screen)
       Ctrl-N: Toggle display of station names
       Ctrl-X: Toggle display of crosses at stations
       Ctrl-L: Toggle display of survey legs
       Ctrl-F: Toggle display of surface legs
       Ctrl-G: Toggle display of grid
       Ctrl-B: Toggle display of bounding box
       O: Toggle display of non-overlapping/all names
       Ctrl-R: reverse sense of controls
       Shift: accelerates all movement keys

       A little experimentation should give a better understanding of how this works.

       There  is an auto-resizing scale bar along the bottom of the screen which varies in length as you zoom in
       or out.  In the lower right corner is a compass pointer showing which way is North, and a  clino  pointer
       showing  the  angle  of  tilt.  And in the upper right is a colour key showing the correspondence between
       colour and depth (by default - you can also colour by date or by error).

OPTIONS

       -p, --print
              Print the specified file and exit.

       -s, --survey=SURVEY
              Only load the sub-survey 'SURVEY'.

SEE ALSO

       cavern(1), diffpos(1), dump3d(1), extend(1), sorterr(1), survexport(1)

                                                 09 January 2019                                         AVEN(1)