What happened when this last command was executed is that the program FreeWRL was launched and asked to visualize some data that represents the 3D surface. Interaction with FreeWRL is done through the mouse and keyboard :
When in ``examine mode'' (the default), dragging with the left button rotates the object, while dragging up and down with the left button zooms out and zooms in.
When the 'w' key is hit, FreeWRL switches to ``walk mode'' , in which left-dragging up or downwards will move the viewpoint forward or backward. Left-or-right-dragging to the left or right directions will move the viewpoint left or right, respectively. Finally, right-dragging up or down moves the viewpoint up and down. You may switch back to the ``examine'' mode by hitting the 'e' key.
Hitting 's' saves a snapshot freewrl.snap.0001.ppm in the current directory; subsequent snapshots will be numbered 0002, etc. Each time FreeWRL is launched, the count is restarted so beware that previous snapshots may be overwritten.
Last but important, the 'q' key will exit FreeWRL.
Søren Hauberg 2009-06-07