/** Sets the cutoff angle of a spotlight. Beyond this angle from its axis
the spotlight provides no illumination. Must be between 0 and 90 degrees,
or exactly 180 degrees to indicate a non-spotlight. */
/** Sets the cutoff angle of a spotlight. Beyond this angle from its axis
the spotlight provides no illumination. Must be between 0 and 90 degrees,
or exactly 180 degrees to indicate a non-spotlight. */