看一下幫助,裡面有 V{}TG]
INTERFACE r [ t m m'] ? ;B:\e8
COAT k coat coat' /u"Iq8QA
-k "#Q"gC.K
+k ^{E_fQJX
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. SF[Z]|0gs
+ 指只有折射沒有反射光, *2YWvGc
- 指只有反射沒有折射。