aven 1 aven sophisticated cave viewer for Unix and MS Windows aven options .3d file 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! 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 Comma / 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 Crosses and/or labels can be displayed at survey stations. /: Higher/Lower Viewpoint 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 depth bar showing the correspondence between colour and depth.