*raypathsave.way

This file output the photon path. The format is

Photon_number  Numofstop_points
x(1)  y(1) vx(1) vy(1) 
x(2)  y(2) vx(2) vy(2) 
x(3)  y(3) vx(3) vy(3) 
 ....
x(N)  y(N) vx(N) vy(N) 
Photon_number2  Numofstop_points2
x(1)  y(1) vx(1) vy(1) 
x(2)  y(2) vx(2) vy(2) 
x(3)  y(3) vx(3) vy(3) 
 ....
x(N2)  y(N2) vx(N2) vy(N2) 
 ....  repeat until all photons are saved