POV-Ray : Newsgroups : povray.binaries.images : cubic interpolation for image_maps (2 jpegs - 63kb) : Re: cubic interpolation for image_maps (2 jpegs - 63kb) Server Time
2 Aug 2024 20:20:05 EDT (-0400)
  Re: cubic interpolation for image_maps (2 jpegs - 63kb)  
From: Tek
Date: 7 Mar 2007 23:41:48
Message: <45ef940c@news.povray.org>
"Samuel Benge" <stb### [at] hotmailcom> wrote in message 
news:45eef8a7$1@news.povray.org...
> I was hoping that Tek's blended cells technique would work well for 
> height_fields, but as it turns out, those extra "Steps" don't look so 
> good... maybe if other things were done to the pigment it would be good. 
> Oh well :) I figured I should post it anyway.

IMO the problem is it's only blending to the adjacent cell, and it always 
uses pov's cubic curve rather than trying to maintain a smooth gradient. If 
I'm understanding correctly Vincent's technique was actually doing cubic 
interpolation, rather than just using cubic_wave (which isn't equivalent)...

Of course I'm saying all this without checking anyone's source code, but 
since it's based on my blended cells I would expect it to create curved 
steps where there should be a smooth gradient, which would cause the problem 
you're seeing.

Wow I explained that really badly!

-- 
Tek
http://evilsuperbrain.com


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