Real Space 3D Drawing

[Neil Cooke]

Hi List,   Does anyone know of a 3D drawing system that can happen in real space.   On a plotter you move the pen from A to B and a virtual 2D line happens, some plotters and mouse type inputs allow pressure to set up a virtual line that lifts up or runs lower than the plotter surface ... what I am interested in is a pen that simply runs in real space, no plotter. It could trace surface lines of a face for example.   Neil Cooke