看一下幫助,裡面有 /rp.H'hC
INTERFACE r [ t m m'] ? $P#Cf&R
COAT k coat coat' C
9IKX
-k F?=(4Pyvu
+k /5M@>A^?'
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. Z'c{4b`N
+ 指只有折射沒有反射光, t/z]KdK P
- 指只有反射沒有折射。