vectorToFieldAngle¶

lsst.cbp.coordUtils.
vectorToFieldAngle
(vec, flipX)¶ Convert a vector to a pupil field angle.
Parameters:  vec : sequence of 3
float
3dimensional vector in the pupil frame; the magnitude is ignored, but must be large enough to compute an accurate unit vector.
 flipX : bool
Set True if the x axis of the focal plane is flipped with respect to the pupil.
Returns:  fieldAngle :
tuple
of 2float
x,y pupil field angle (radians).
 vec : sequence of 3