Allow me to repost here for depth/frequency setting hD{
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The main fresnel lens types are: J?Oeuk~[D
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* Constant groove depth. 1x8wQ/ p|
* Contant groove pitch types. ,&L}^ Up
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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. jB`:(5%RO
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For radius, this is the curvature of the base surface. If you define one such lens and chaneg the radius and you shall see what it means. A graphic tells lounder than words. +.Xi7x+#O
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For conic: check conic section using Wikipedia and you should see what conic constant means. <v=s:^;C0
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