AR Sandbox Calibration - Step 4

Video illustrating calibration step 4 for the augmented reality sandbox, as listed in the README file. This step uses RawKinectViewer and a plane extraction tool to calculate the plane equation of the average sand surface in camera space, needed to account for non-vertical Kinect camera viewpoints, and to adjust the zero-elevation level for topographic maps. More information: ~okreylos/ResDev/SARndbox