看一下幫助,裡面有 +['1~5
INTERFACE r [ t m m'] ? T|YMU?4
COAT k coat coat' MbTmdRf
-k ,FRa6;
+k M6]:^;p'
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. KV{
+ 指只有折射沒有反射光, 4.kn,s
- 指只有反射沒有折射。