POV-Ray : Newsgroups : povray.pov4.discussion.general : Suggest v4.0 ripples, waves re-work. (povr R7 v0.6.1.0) : Re: Suggest v4.0 ripples, waves re-work. (povr R7 v0.6.1.0) Server Time
1 Jun 2023 01:23:15 EDT (-0400)
  Re: Suggest v4.0 ripples, waves re-work. (povr R7 v0.6.1.0)  
From: Alain Martel
Date: 18 Mar 2023 15:56:04
Message: <64161754$1@news.povray.org>
Le 2023-03-18 à 09:58, William F Pokorny a écrit :
> There are a number of issues with the current ripples and waves 
> patterns. For the record, there is a set of two for normal{} 
> perturbation and another scalar value set of two for use with functions 
> and maps.
> 
> I've not yet pulled the number_of_waves code, but otherwise testing is 
> looking pretty good. The updated ripples code is roughly 18% slower and 
> the waves pattern about 20% slower for 10 sources.
> 
> The basic form of both support the keywords:
> 
> ripples & waves basic (ip_ means internal to pattern)
> ----------------------
> ip_seed <float> // Seed for point source locations.
> ip_count <number of sources> // Number of sources. 2-128 currently.
> ip_frequency <float>
> ip_phase <float>
> 
> 
> waves only basic (waves has always generated source weights/freq too)
> ---------------------
> lo <float> hi <float> // re-range inv weight 0-1.1 values to...
> 
> 
> ripples & waves extended (Use of keywords triggers the extended mode)
> --------------------
> ip_scale <3d vector>
> ip_fade_distance <float post ip_scale> // interior exp fade
> 
> 
> Example used for right side of attached image.
> -------------------
> #declare Fn00 = function { pattern {
>      waves
>      raw_wave // No attempt a heuristic in povr. Adj on use.
>      ip_frequency 2
>      ip_count 14
>      ip_seed e
>      lo 0.3 hi 1.0  // Left side of image didn't use this
>      ip_scale <11,0.1,11>
>      ip_fade_distance e
>      scale <1/11,1,1/11>
> }}
> 
> I spent some time re-rendering a waves based isosurface using a scene 
> with a seed based upon now. Results are interesting. Some very good and 
> some kinda ugly due where the point sources ended up. If looking around 
> for a good seed, remember to print it out or otherwise
> save it for re-use! :-)
> 
> Plus, if thinking about, say, the surface of water, it helps quite a bit 
> to use ip_scale to compress / scale locations toward the plane of the 
> water.
> 
> Bill P.

Pretty interesting improvement upon the current ripples and waves patterns.


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