看一下幫助,裡面有 b"<liGh"n-
INTERFACE r [ t m m'] ? 5 Aw"B
COAT k coat coat' nY[WRt w
-k KC*e/J
+k H*?t^
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. 1SQ3-WUs
+ 指只有折射沒有反射光, H`XUJh
- 指只有反射沒有折射。