I guess the main confusion of defining this lens is probably the setting of depth/frequency. J*f..:m
IlP@a[:_
The main fresnel lens types are: + gP 4MP
(qy82F-|2
* Constant groove depth. l`<u\],
* Contant groove pitch types. [Y Q` `
bQ_N^[oxQ
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. i<uk}
~_yz\;#
Hope this helps!!
