看一下幫助,裡面有 aPR0DZ@
INTERFACE r [ t m m'] ? 3Ryae/Nk
COAT k coat coat' AeQIsrAHE
-k orT%lHwjL
+k &CtWWKS"
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. =Gl6~lJ{_
+ 指只有折射沒有反射光, Cf~H9
- 指只有反射沒有折射。