I guess the main confusion of defining this lens is probably the setting of depth/frequency. ;.Ie#Vr1N
=!U R=Hq
The main fresnel lens types are: lvpc*d|K
J.+BD\pa
* Constant groove depth. c$,_>tc P
* Contant groove pitch types. hv$m4,0WB
3!o4)y JWx
So if your depth is fixed you will define +ve value in the cell and to specify the "height" or "depth" of each groove feature. If the frequency of the groove is fixed then you use -ve value. Say putting down - 5 this implies that there are 5 grooves with a unit length. X$b= {]b
\zkw2*t
Hope this helps!!
