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ConstantsAxes
x y z w Don't use "w" in 3D, of course. See below for info about how the axes are oriented. Directions
x+ y+ z+ w+ A direction is an axis plus a sign. When you first load a new file, the x axis points to the right and the y axis points upward. In 3D, the coordinate system is lefthanded, so the z axis points away from you. In 4D, the overall coordinate system is probably also lefthanded, but the z axis points in the "out" direction and looks righthanded. The w axis points away from you. Unit Vectors
X+ Y+ Z+ W+ If you make the letters uppercase, then instead of symbolic direction codes you get unit vectors. You can already enter vectors as arrays, so these are just shorthand, mainly for use with the "place" command. For example, "W" is short for "[0 0 0 1]". The vectors are all fourdimensional, but they still work with the threedimensional "place" command. Colors The following colors are predefined. Other colors can be entered with the HTML syntax #RRGGBB.
red cyan orange gray Boolean Constants
true false The Null Constant The command "null" puts a null on the stack. The alias "?" is also defined for backward compatibility.

See AlsoGeometry Commands 