看一下幫助,裡面有 1*, f
INTERFACE r [ t m m'] ? F<VoPqHq
COAT k coat coat' r$<[`L+6
-k G$( B26
+k `C9/=
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. PQDWY
+ 指只有折射沒有反射光, 0
fX
- 指只有反射沒有折射。