看一下幫助,裡面有 b|SE<\
INTERFACE r [ t m m'] ? M4ozTp<$O
COAT k coat coat' ?S?2 0
-k Wlh~)
+k XPB9~::
The signs in front of k can be used to instruct ASAP to either propagate only a reflected ray (-k: t=0) at that object or to propagate only a transmitted ray (+k: r=0) at that object. oJKa"H-jL
+ 指只有折射沒有反射光, gn5)SP 8
- 指只有反射沒有折射。