Returns an array containing vectors to the boundary of the nominated pixel.
The returned array has shape (3, 4*step), the elements of which are the x,y,z positions on the unit sphere of the pixel boundary. In order to get vector positions for just the corners, specify step=1.
The nside of the Healpix map.
- stepint, optional
Number of elements for each side of the pixel.
- nestbool, optional
if True, assume NESTED pixel ordering, otherwise, RING pixel ordering
- boundaryfloat, array
x,y,z for positions on the boundary of the pixel