檢視 @ETERNITY 的原始碼

*When @ETERNITY is .TRUE. photon won't die on the system. If [[@LASER_NUM]] is larger then one, list them separated by ",".
*Is store as '''eternity''' in the fortran code.

example
 @ETERNITY
 .false.

Which mean the system has one laser, and the simulated photons will die along the light path.