看一下幫助,裡面有 blk4@pg
INTERFACE r [ t m m'] ? eVetG,["
COAT k coat coat' |c)hyw?[Y
-k 7;i [
+k 0# d:<+4D
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. !P"@oJ/Yy_
+ 指只有折射沒有反射光, e|e"lP
- 指只有反射沒有折射。