看一下幫助,裡面有 o$p]
p9
INTERFACE r [ t m m'] ? M7fPaJKL
COAT k coat coat' RRb>]oD
-k 2RU/oqmR
+k J4]tT pu"K
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. 79z/(T+
+ 指只有折射沒有反射光, FrsXLUY
- 指只有反射沒有折射。