看一下幫助,裡面有 mA>u6Rlc
INTERFACE r [ t m m'] ? y(0";\V
COAT k coat coat' uO;_T/^u
-k 8.4+4Vxh
+k b)Dzau
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. UFY_.N~
+ 指只有折射沒有反射光, b6A]/290x
- 指只有反射沒有折射。