3D ray tracing

With 3D N-body PM simulation one can construct realistic shear maps. A number of systematic effects can then be studied in details, including, strong non-linear dynamics; Lens-lens coupling effects; source clustering effects (effects of intrinsic clustering and effects of lens-source overlap). Preliminary results are presented in , "Numerical study of the cosmic shear" by Hamana, Colombi and Mellier Example of 3D mass distribution,