看一下幫助,裡面有 DUliU8B}\
INTERFACE r [ t m m'] ? t-x"(
COAT k coat coat' (*WZsfk>/<
-k 898wZ{ 9
+k
=ObtD"
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. JTB~nd>
+ 指只有折射沒有反射光, 4Hpu EV8Q
- 指只有反射沒有折射。