convertVectorFromBaseToPupil¶
-
lsst.cbp.coordUtils.
convertVectorFromBaseToPupil
(vectorBase, pupilAzAlt)¶ Given a vector in base coordinates and the pupil pointing, compute the vector in pupil coordinates.
Parameters: - vectorBase : sequence of 3
float
3-dimensional vector in the base frame.
- pupilAzAlt :
lsst.geom.SpherePoint
Pointing of the pupil frame as internal azimuth, altitude.
Returns: - vectorPupil :
np.array
of 3float
3-dimensional vector in the pupil frame.
Notes
This could be implemented as the following Euler angle rotation matrix, which is: - first rotate about the z axis by azimuth - then rotate about the rotated -y axis by altitude - there is no third rotation
c1*c2 -s1 -c1*s2 c2*s1 c1 s1s2 s1 0 c2
where angle 1 = azimuth, angle 2 = altitude, sx = sine(angle x) and cx = cosine(angle x).
Knowing this matrix is helpful, e.g. for math inside computeAzAltFromBasePupil.
- vectorBase : sequence of 3