I guess the main confusion of defining this lens is probably the setting of depth/frequency. 5H'Iul<Os
*vQ 6LF;y
The main fresnel lens types are: .Bj WZj
`; Ui6{|
* Constant groove depth. N 75U.;U0
* Contant groove pitch types. ,3rsjoKhd
6Takx% U
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. }S"gZ6
|>P:R4P
Hope this helps!!
