看一下幫助,裡面有 ;-d :!*
INTERFACE r [ t m m'] ? 6!n%SUt
COAT k coat coat' yVM
1W"Q
-k }0Q6iHX@
+k `QlChxd
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. b|*A%?m
+ 指只有折射沒有反射光, >p 7e6%
- 指只有反射沒有折射。