看一下幫助,裡面有 R{Z-m2La
INTERFACE r [ t m m'] ? ]w).8=I
COAT k coat coat' ,V]
]:eR
-k &$FvWFRh#
+k 6(&Y(/
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. Lz9#A.
+ 指只有折射沒有反射光, G`h+l<
- 指只有反射沒有折射。