I guess the main confusion of defining this lens is probably the setting of depth/frequency. 0tm_}L$g=b
sJI -
The main fresnel lens types are: f+TB s_
_l!U[{l*d
* Constant groove depth. yp2 'KES>
* Contant groove pitch types. _h=< _Z
E}b> 7L&w
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. E0)mI)RW.
FQ|LA[~
Hope this helps!!
