看一下幫助,裡面有 )OHGg
INTERFACE r [ t m m'] ? FD'yT8]"
COAT k coat coat' 6 &Lr/J76
-k moS0y?N
+k n
f.H0i;
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. sGFvSW
+ 指只有折射沒有反射光, H #Hhi<2
- 指只有反射沒有折射。