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.

Post a reply to this message

Attachments:
Download 'try.mp4.dat' (2790 KB)