computeShiftedPlanePos¶

lsst.cbp.coordUtils.
computeShiftedPlanePos
(planePos, fieldAngle, shift)¶ Compute the plane position of a vector on a plane shifted along the optical axis.
Parameters:  planePos : pair of
float
Plane position at which the vector intersects the plane (x, y).
 fieldAngle : pair of
float
Field angle of vector (x, y radians).
 shift :
float
Amount by which the new plane is shifted along the optical axis. If
shift
and both components offieldAngle
are positive then both axes of the shifted plane position will be larger (more positive) thanplanePos
.
Returns:  shiftedPlanePos : tuple of
float
Plane position at which vector intersects the shifted plane (x, y).
Notes
flipX
is not an input because for this computation it does not matter if the x axis is flipped: fieldAngle and planePos are either both flipped or not, and that cancels out the effect. planePos : pair of