看一下幫助,裡面有 ~99Ta]U
INTERFACE r [ t m m'] ? SIzW3y[
COAT k coat coat' #%B1,.A
-k }fL8<HM\'c
+k A10/"Ec<u
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. "5ah{,
+ 指只有折射沒有反射光, Z}$.Tm
- 指只有反射沒有折射。