I guess the main confusion of defining this lens is probably the setting of depth/frequency. xl9l>k6,
4Oy
c D
The main fresnel lens types are: o D 8-I^
j;y|Ys)I
* Constant groove depth. !^7:Rr _
* Contant groove pitch types. gky_]7Av
~9c9@!RA2
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. Ov|j{}=L=9
)6j:Mbz
Hope this helps!!
