看一下幫助,裡面有 y":Y$v,P
INTERFACE r [ t m m'] ? H<gC{:S
COAT k coat coat' 8&gr}r-
5
-k a{oG[e
+k ;QRnZqSv
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 Lt:o4x
+ 指只有折射沒有反射光, sBsf{%I[{
- 指只有反射沒有折射。