看一下幫助,裡面有 D&)w =qIu
INTERFACE r [ t m m'] ? qG Abh
COAT k coat coat' F:3*i^ L
-k ".@}]z8
+k I: j!A
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. L`iC?<}
+ 指只有折射沒有反射光, QqF&lMH
- 指只有反射沒有折射。