The -R option specifies a rotation about the origin. If the argument is
four values this is a rotation about a single axis. The first three values
are a vector giving the direction of the axis, the fourth value is the number
of degrees to rotate. In this example the model is rotated 30 degrees
around an axis in the direction (1, 1, 0); halfway between the x and y axes.
View this model with the command
off_color -r A0.2,f ant4 > orig.off
off_trans -R 1,1,0,30 ant4 | antiview -C 0,0,0 - orig.off