看一下幫助,裡面有 2iWxx:e
INTERFACE r [ t m m'] ? q.p.y0
COAT k coat coat' y~+U(-&.
-k luO4ap]*
+k h/#s\>)T
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. ':T6m=yv
+ 指只有折射沒有反射光, +*$@ K'VL
- 指只有反射沒有折射。