orient3, phi, theta
or orient3, phi
or orient3, , theta
Set the "orientation" of the object to (PHI,THETA). "Orientations"
are a subset of the possible rotation matrices in which the z-axis
of the object appears vertical on the screen (that is, the object
z-axis projects onto the viewer y-axis). The THETA angle is the
angle from the viewer y-axis to the object z-axis, positive if
the object z-axis is tilted toward you (toward viewer +z). PHI is
zero when the object x-axis coincides with the viewer x-axis. If
neither PHI nor THETA is specified, PHI defaults to -pi/4 and
THETA defaults to pi/6. If only one of PHI or THETA is specified,
the other remains unchanged, unless the current THETA is near pi/2,
in which case THETA returns to pi/6, or unless the current
orientation does not have a vertical z-axis, in which case the
unspecified value returns to its default.
Unlike rot3, orient3 is not a cumulative operation.
interpreted function, defined at i/pl3d.i line 127