看一下幫助,裡面有 MW$
X4<*KD
INTERFACE r [ t m m'] ? }[m,HA<j
COAT k coat coat' z6f N)kw
-k N#"(
+k vS_Ji<W~E
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. ae`6hW2
+ 指只有折射沒有反射光, MeXGE
- 指只有反射沒有折射。