A position object represents a location in 3D Cartesian space, and is subject to certain direction and transformation operations. Position coordinates are entered relative to the active coordinate system.
#[position %.15g %.15g %.15g ] where the first double is the x-coordinate, the second double is the y-coordinate, and the third double is the z-coordinate.
; position (data type) ; Define and inquire a position object. (define my_origin (position 0 0 0)) ;; my_origin (position? my_origin) ;; #t