I guess the main confusion of defining this lens is probably the setting of depth/frequency. NcF>}f,}\
-p)`o b-
The main fresnel lens types are: bF_0',W
IO"P /Q
* Constant groove depth. T5ky:{Y(
* Contant groove pitch types. m)pHCS
h~Z &L2V
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. JcmMbd&B
3I( n];
Hope this helps!!
