看一下幫助,裡面有 vhAgX0k
INTERFACE r [ t m m'] ? z;F HZb9t,
COAT k coat coat' gPb.%^p
-k C*3St`2@9
+k Em^~OM3U$q
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. 8>Cf}TvErx
+ 指只有折射沒有反射光, +:4>4=
- 指只有反射沒有折射。