看一下幫助,裡面有 u$%;03hJ
INTERFACE r [ t m m'] ? )xxpO$
COAT k coat coat' vvwQ/iJO4Q
-k 5BAGIO<w
+k \&jmSa=]l
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. `ttqgv\
+ 指只有折射沒有反射光, VsjE*AJpe
- 指只有反射沒有折射。