I guess the main confusion of defining this lens is probably the setting of depth/frequency. /Xf_b.ZM&
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The main fresnel lens types are: CKy/gTN
P={8qln,X
* Constant groove depth. =QS%D*.|D
* Contant groove pitch types. #M@K i1
N'n\_ x
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. iTc q=
L =9 ^Y/8Q
Hope this helps!!
