Introduction - If you have any usage issues, please Google them yourself
Calculation of finite difference beam method combined with the dissemination of the procedure, very helpful
Packet : 57578849fdbpm_3d.zip filelist
FDBPM3D.jpg
FDBPM3D_free_space.m
FDBPM3D_free_space_slice.m
FDBPM3D_free_space_volume.m