看一下幫助,裡面有 _~6AUwM
INTERFACE r [ t m m'] ? ;;UvK
v
COAT k coat coat' rj,Sk~0Q
-k U-|gtND
+k [5:F
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. ~r=u1]z
+ 指只有折射沒有反射光, m,8A2;&,8
- 指只有反射沒有折射。