I guess the main confusion of defining this lens is probably the setting of depth/frequency. !{ )AV/\D
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The main fresnel lens types are: 1R~WY'Ed
OU3 +SYM
* Constant groove depth. r`"#c7)
* Contant groove pitch types. M{kh=b)V
MldL" *HW:
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. &^D@(m7>{K
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Hope this helps!!
