angles, the roughness seems immaterial. The rays that contribute to this specular reflection are 

 almost all those that reflect from the smooth surface without touching a k.eel. The function 

 shown here is thus a measure of the unshadowed surfacs as seen from both the source and 





Theory tor constant-depth bosses holds that the reflection loss, which becomes large at 

 low grazing angles, should recover at very low angles and become zero at zero-degree grazing 

 angles. However, computations with this program down to 0.75 degree have shown no 

 tendency towards recovery of the reflection loss. 



<8 



SetC 



K^-V^^^ 



Figure 6 Angular scatering functions by 2-degree bins for keel 

 sets A, B. and C. 



