I guess the main confusion of defining this lens is probably the setting of depth/frequency. Z&M fE0F/B
5n#@,V.O/
The main fresnel lens types are: :L&d >Ii|'
B.ar!*X
* Constant groove depth. QZO9CLX 8k
* Contant groove pitch types. ,enU`}9V*
Lk8NjK6
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. Dxx`<=&g
y7LT;`A
Hope this helps!!
