看一下幫助,裡面有 L^lS^P
INTERFACE r [ t m m'] ? ~L~]QN\3
COAT k coat coat' 1YFeVMc
-k s}wO7Df=+
+k ! Q!&CG5l
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. -TgUyv.
+ 指只有折射沒有反射光, TZ'aNcGg
- 指只有反射沒有折射。