看一下幫助,裡面有 rVryt<2:@r
INTERFACE r [ t m m'] ? uJow7-FD
COAT k coat coat' z&+
zl6
-k =@r--E
+k s#-eN)1R
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. TI9X.E?
+ 指只有折射沒有反射光, pGWA\}'
- 指只有反射沒有折射。