看一下幫助,裡面有 <$A/ ('
INTERFACE r [ t m m'] ? _7:Bxx4B
COAT k coat coat' (_}q>3
-k DpmAB.
+k Z*q&^/N
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. JLWm9c+UTG
+ 指只有折射沒有反射光, a6z0p%sIZ
- 指只有反射沒有折射。