unity光束Light Beams
所支持的Unity版本：5.2.2 及以上版本
Light shaft / beams simulation shaders and sc ripts.
Control fade distance, beam intensity, normal softness, texture move speed and other.
Wall collision control included.
Included are single and double sided versions.
Also you can choose between color versions or    color and texture ( dust simulation ) versions .
Double sided shader versions require shader model 3.0 or    higher.