William F Pokorny <ano### [at] anonymousorg> wrote:
> I recently made a post about rolling your own random noise generators
> with f_hash() over in the v4.0 forum:
>
>
https://news.povray.org/povray.pov4.discussion.general/thread/%3C674b018b%40news.povray.org%3E/
>
> I found myself with a few hours to burn this afternoon so I gave
> creating a special noise video a try based upon f_hash(). The core
> of the code is:
>
>      #include "functions.inc"
>      #declare Seed00 = 7834.5540283051168443;
>      #declare Delta = 880+frame_number*0.00002;
>      #declare Step = sqrt(Delta)      *0.00025;
>
>      #declare Fn2Dlen = function (x,y) {
>          f_2x_f32_vlength(f_enc2x_f32(x,y))
>      }
>      #declare Fn00 = function {
>          f_hash(
>              (
>              f_hash(Fn2Dlen(x+Delta,y+Delta),Seed00,Step,0)+
>              f_hash(Fn2Dlen(x-Delta,y+Delta),Seed00,Step,0)+
>              f_hash(Fn2Dlen(x+Delta,y-Delta),Seed00,Step,0)+
>              f_hash(Fn2Dlen(x-Delta,y-Delta),Seed00,Step,0)
>              ),
>          Seed00,0,0)
>      }
>
>      #declare Pigm00 = pigment {
>          function { Fn00(x,y,z) }
>      }
>
> Above there are four distance to x,y coordinate based f_hash()s feeding
> a final f_hash() function - all using the same seed value. An mp4 video
> attached.
>
> Bill P.

This is hypnotic, but maybe too small scaled to let us gaze at its evolution...
Unless it can't show bigger cells ?

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