看一下幫助,裡面有 4a;8XAl
INTERFACE r [ t m m'] ? JHN35a+
COAT k coat coat' XfFZ;ul
-k P%5h!Z2m
+k 6Cut[*lj^
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. 6KmF 9
+ 指只有折射沒有反射光, M>df7.N7%P
- 指只有反射沒有折射。