看一下幫助,裡面有 F!)[H["_
INTERFACE r [ t m m'] ? m[3c,Axl7
COAT k coat coat' /NCN wAj7
-k ?#(LH\$l_
+k j<0;JAL
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. 4=|Q2qgFV
+ 指只有折射沒有反射光, IjRUr \ l
- 指只有反射沒有折射。