Allow me to repost here for depth/frequency setting
Zg$S% 1(Q The main fresnel lens types are:
7u{V1_ n1 y8_$YA/g * Constant groove depth.
t"zi'9$t * Contant groove pitch types.
@9eN\b%I^H zuu<;^/R 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.
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