This site hosts experiments comparing RadViz3D to RadViz2D and Viz3D.
This page contains a navigation bar on the left for accessing each dataset.
(Warning: The loading time for the Visualizations page could be long.)
The 3D interactive plots are implemented with the rgl functions and here are instructions for manipulation:
Rotation: Click and hold with the left mouse button, then drag the plot to rotate it and gain different perspectives.
Resize: Zoom in and out with the scroll wheel, or the right mouse button.