The Micro scribe Digitizer allows one to create points in Rhino based off of a physical model. The working volume is approximately 20" x 20" x 30". To activate the digitizer within Rhino, use Tools > 3-D Digitizer > Connect then select Micro scribe Digitizer Support. You will be prompted to enter an X and Y axis and specify a point in your Rhino file to match the origin of the digitized area. You can then use the digitizer as you would a mouse.