看一下幫助,裡面有 !*. -`$x
INTERFACE r [ t m m'] ? SHo$9+
COAT k coat coat' 7 uKY24
-k !pdb'*,n
+k RnI&8
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. &,CiM0
+ 指只有折射沒有反射光, FXN/Yq
- 指只有反射沒有折射。