Allow me to repost here for depth/frequency setting
ML]?`qv ' The main fresnel lens types are:
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( T]myhNk * Constant groove depth.
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DO6J * Contant groove pitch types.
{jl4` Vy? w,E0^: 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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