Opal Playpen, version r423

Playpen is a simple physically simulated arena where objects can be created and manipulated.  It uses Opal (http://opal.sourceforge.net) and ODE (http://www.ode.org) for physics and Ogre (http://www.ogre3d.org) for graphics.

- Tyler Streeter, http://www.tylerstreeter.net


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Instructions
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'wasd' keys or arrow keys: move the camera
mouse motion: rotate the camera
keys 1-9: create objects
r: reset the scene
p: pause
q or escape: quit
h: toggle shadows
l: toggle a second light source
g: toggle runtime performance monitor
'print screen' key: save a screenshot

To move objects with the "spring cursor," left-click and drag them.
