| hopebox |
2010-06-10 21:36 |
Allow me to repost here for depth/frequency setting Q}a(vlZ
The main fresnel lens types are: YD{N )v
@D `j
* Constant groove depth. L {&=SR.
* Contant groove pitch types. #\ysn|!J,
]1W ]
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. VUz+ _)
b ):aqRwP
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. */K]sQZa
2v#gCou
For conic: check conic section using Wikipedia and you should see what conic constant means. k2PK4Ua_}q
k `5K&
[ ;ZC_fD
|
|