看一下幫助,裡面有 y B81f
INTERFACE r [ t m m'] ? `Y0%cXi3
COAT k coat coat' ]
7[
3>IN
-k 'NbHa!
+k /m!BY}4W
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. .97])E[U
+ 指只有折射沒有反射光, Gf%~{@7=u
- 指只有反射沒有折射。