看一下幫助,裡面有 ]l~Vi_c
INTERFACE r [ t m m'] ? dV?5Q_}
COAT k coat coat' }<jb vCeK
-k NDO\B,7
+k I =Wc&1g
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. ^O^:$nXhYy
+ 指只有折射沒有反射光, '<iK*[NW
- 指只有反射沒有折射。