看一下幫助,裡面有 l.>QO ;
INTERFACE r [ t m m'] ? ,f}s!>j
COAT k coat coat' yBs
-k ^J@Y?CQl\
+k %8hhk]m\b>
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. \>:(++g
+ 指只有折射沒有反射光, xxiEL2"`>
- 指只有反射沒有折射。