出版社：SISSA, Scuola Internazionale Superiore di Studi Avanzati
摘要：Ray shooting is a powerful but numerically costly means of solving the lens equation. Unlike
pure numerical root finding techniques, ray shooting can automatically address the problem of
finite size effects by defining the target area and, if necessary, weighting rays according to a
limb-darkening model. This flexibility usually comes at the cost of calculating many - mostly unnecessary
- rays. The method can be accelerated by isolating the areas of the lens plane required
for each data point using targets distant from singularities. After an initial estimation of parameters,
a pre-calculated grid of magnification patterns can then be searched for a global minimum
of chi-square.
