I guess the main confusion of defining this lens is probably the setting of depth/frequency. 4[m4u6z=
4 O~zkg
The main fresnel lens types are: LXcH<)
Fu#mMn0c
* Constant groove depth. /g]m,Y{OI
* Contant groove pitch types. ZG)%vB2c
a`uHkRX
)U
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. AP_2.V=Sn
F /% 5 r{
Hope this helps!!
