NAME

       aven — sophisticated cave viewer for Unix and MS Windows

SYNOPSIS

       aven [options]  .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
       <C>, <V>: Rotate cave one step clockwise/anti-clockwise
       <'> , </>: Higher/Lower Viewpoint
       <]> , <[>: 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).

See Also

       3dtopos(1), cad3d(1), cavern(1), diffpos(1), extend(1), sorterr(1), svxedit(1)

                                                                                          aven(1)