POV-Ray : Newsgroups : povray.beta-test : v3.8+ crackle instability (facets?) with >1 uses per thread. : Re: v3.8+ crackle instability (facets?) with >1 uses per thread. Server Time
10 Dec 2024 06:52:43 EST (-0500)
  Re: v3.8+ crackle instability (facets?) with >1 uses per thread.  
From: William F Pokorny
Date: 12 Nov 2024 03:17:16
Message: <67330f0c$1@news.povray.org>
On 11/11/24 15:30, Bald Eagle wrote:
> Relevant search results and further reading:
> 
> Stephane Laurent (stla)
> https://github.com/stla/Apollonius
> 
> Inigo Quilez
> https://www.shadertoy.com/view/4sd3D7
> 
> Voronoi Diagram Research Center
> http://voronoi.hanyang.ac.kr/c3_voronoiDiagrams.htm
> 
> Need to further look into:
> Johnson-Mehl tessellation
> 

Thanks for the references. IIRC shadertoy has a distance method to draw 
the outline of cells, but I don't recalled the particulars at the 
moment. I have ideas for how to do it in C++, but I also wonder if in 
yuqk it cannot already 'mostly' be done. Stuff like this why I added the 
ip_raw_return as a yuqk crackle option. Maybe I'll take a 'crack' at it 
in a bit.

I see a path to something like a the Delaunay dual for which performance 
might be acceptable, but due the current limits to the three closest 
measures it would be limited / degenerate in a strict sense.

As for other extensions, some might be worth a try.

With a lot of this voronoi like stuff, 2d is a lot easier than three. 
General, solid 3D solutions likely requires stand alone dedicated code. 
We are working under the constraint that we want a reasonably performant 
pattern in the end - as you know :-).

Bill P.


Post a reply to this message

Copyright 2003-2023 Persistence of Vision Raytracer Pty. Ltd.