POV-Ray : Newsgroups : povray.binaries.images : First image posting : Re: First image posting Server Time
14 May 2021 02:17:54 EDT (-0400)
  Re: First image posting  
From: Thomas de Groot
Date: 3 May 2021 02:36:24
Message: <608f99e8$1@news.povray.org>
Op 02/05/2021 om 14:11 schreef Bald Eagle:
> Thomas de Groot <tho### [at] degrootorg> wrote:
> 
>>> Presumably, this is what all this "mip-mapping" business is about.   Has anyone
>>> ever tried to emulate that process, that we know of?
>>>
>> Good question. It would be interesting to try indeed. RoundTuits are
>> needed however!
> 
> https://www.youtube.com/watch?v=0flY11lVCwY
> He covers this briefly in the first 2 minutes.
> 
> Just shooting from the hip here, but it sounds like a functional emulation of
> this would be to start with a very large, high-def version of the texture and
> then make a few smaller versions.   Then just have an array of the filenames and
> the texture could probably be automagically sampled at the desired resolution
> using a polynomial function like I did in the vortex scene or using a spline
> like Ingo is doing.
> 
By default, a factor 2 scaling is used, I understand. That is not 
difficult; what is (at least for me) is how to chose the right texture 
for each render or location in the scene (for instance the background of 
a chequered plane smoothly grading into the foreground). Well, I have an 
idea of course, but no time to test it out presently. :-/

> Maybe there's some kind of MOA (minutes of angle) calculation that initially
> gets done to optimally set the different image_map resolutions...?
> 
Hmm... possibly. I have no idea at this stage however.

-- 
Thomas


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