看一下幫助,裡面有 'R'a/ZR`B7
INTERFACE r [ t m m'] ? l'%R^
COAT k coat coat' 3(*s|V"
-k K/+C6Y?
+k hBE>e a
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. 5@%-=87S
+ 指只有折射沒有反射光, I8;[DP9
- 指只有反射沒有折射。