看一下幫助,裡面有 pmB}a7
INTERFACE r [ t m m'] ? <M=U @
COAT k coat coat' C*ZgjFvB
-k PTIC2
+k `R0>;TdT
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[Cm4
+ 指只有折射沒有反射光, xZPSoxu
- 指只有反射沒有折射。