看一下幫助,裡面有 !@VmaAT
INTERFACE r [ t m m'] ? >5^Z'!Z"
COAT k coat coat' .\U+`>4av
-k J|xqfY@+
+k uaU!V4-
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. 9,y&?GLP
+ 指只有折射沒有反射光, ' J-(v
- 指只有反射沒有折射。