看一下幫助,裡面有 l4&
l)4Rx
INTERFACE r [ t m m'] ? H=mFc@fh
COAT k coat coat' `r %lB
-k MIqH%W.ru
+k KppYe9?
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. 5?f!hB|6
+ 指只有折射沒有反射光, 9&Z+K'$=
- 指只有反射沒有折射。