看一下幫助,裡面有 :r>^^tGT!
INTERFACE r [ t m m'] ? 35Yf,@VO
COAT k coat coat' \_ V*Cs
-k D4b-Y[/"
+k &7i&"TNptP
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. Z5E; FGPb
+ 指只有折射沒有反射光, P6&%`$
- 指只有反射沒有折射。