SPH2CART2D Convert spherical coordinates to cartesian coordinates in degrees.

   C = SPH2CART2(THETA, PHI, RHO)
   C = SPH2CART2(THETA, PHI)       (assume rho = 1)
   C = SPH2CART2(S)
   [X, Y, Z] = SPH2CART2(THETA, PHI, RHO);

   S = [phi theta rho] (spherical coordinate).
   C = [X Y Z]  (cartesian coordinate)

   The following convention is used:
   THETA is the colatitude, in degrees, 0 for north pole, +180 degrees for
   south pole, +90 degrees for points with z=0. 
   PHI is the azimuth, in degrees, defined as matlab cart2sph: angle from
   Ox axis, counted counter-clockwise.
   RHO is the distance of the point to the origin.
   Discussion on choice for convention can be found at:
   http://www.physics.oregonstate.edu/bridge/papers/spherical.pdf

   See also:
   angles3d, cart2sph2d, sph2cart2

 ------
 Author: David Legland
 e-mail: david.legland@grignon.inra.fr
 Created: 2011-06-29,    using Matlab 7.9.0.529 (R2009b)
 Copyright 2011 INRA - Cepia Software Platform.

Package: matgeom