看一下幫助,裡面有 5U[bn=n
INTERFACE r [ t m m'] ? FcI ZG _
COAT k coat coat' 23|R $s>}i
-k Ce~
a(J|"
+k 898=9`7e
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. "eOFp\vPr
+ 指只有折射沒有反射光, pGHn
- 指只有反射沒有折射。