I guess the main confusion of defining this lens is probably the setting of depth/frequency. VJFFH\!`
$mE3 FJP>
The main fresnel lens types are: kFC * ,
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* Constant groove depth. aM(# J7;
* Contant groove pitch types. ~PpDrJ; Va
Cb`, N
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. +6
=lN[b
T93st<F=R
Hope this helps!!
