POV-Ray : Newsgroups : povray.binaries.images : Happy Halloween 2020! Server Time: 25 Jan 2021 23:52:17 GMT
  Happy Halloween 2020! (Message 11 to 14 of 14)  
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From: Kenneth
Subject: Re: Happy Halloween 2020!
Date: 2 Nov 2020 12:45:00
Message: <web.5f9ffe2243ae5363d98418910@news.povray.org>
Thomas de Groot <tho### [at] degrootorg> wrote:
>
> This is a smart effect and I never would have thought of using radiosity
> in such a way. I am going to have to play with this! Thanks for sharing!
>

Here is a view from 'behind the scene' ;-)

What I have discovered so far is that my scene produces this effect because the
radiosity-emitting 'cards' are relatively small, compared to the objects they
illuminate. Making the cards 3-times larger (for example) causes the
multi-colored light patches to start blending together, color-wise (and of
course makes the scene brighghter; but that can be compensated for in the code
elsewhere, in the real objects' diffuse settings.) I tried the identical
radiosity settings in my city-buildings scene-- which has a full skydome for its
rad illumination-- and the patchy effect disappears completely. That's probably
because all of the individual color patches have completely 'blended together'.

Some other interesting discoveries: When the camera moves closer or farther away
from the real objects, the light-patch sizes remain the same, relative to the
render window. They don't visually get larger or smaller. However, when altering
the camera's 'angle' value ("zooming in"), the patches DO get larger.

Btw, I'm also experimenting with adding a normal statement to the camera-- like
a very small-scaled 'bumps' pattern-- to break up the light patches a bit (and
the objects' own straight-line outlines) to create more of a 'hand-painted'
look.


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Attachments:
Download 'rad_art_behind_the_scenes.jpg' (91 KB)

Preview of image 'rad_art_behind_the_scenes.jpg'
rad_art_behind_the_scenes.jpg


 

From: Kenneth
Subject: Re: Happy Halloween 2020!
Date: 2 Nov 2020 13:00:00
Message: <web.5fa0019143ae5363d98418910@news.povray.org>
"Kenneth" <kdw### [at] gmailcom> wrote:
>
> Some other interesting discoveries:

I forgot to mention that even pure WHITE radiosity cards still produce the
'patchy' look, surprisingly, although the effect is then just gray-scale.

Btw, I did try my idea of making the card images as 3-color 'rough-outline
blobs' instead of concentric circles; but I cannot really tell if this alters
the look of the individual patches. If it does, it is only a very subtle change.


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From: Paolo Gibellini
Subject: Re: Happy Halloween 2020!
Date: 4 Nov 2020 08:31:16
Message: <5fa266d4$1@news.povray.org>
Kenneth wrote on 02/11/2020 13:57:
> "Kenneth" <kdw### [at] gmailcom> wrote:
>>
>> Some other interesting discoveries:
> 
> I forgot to mention that even pure WHITE radiosity cards still produce the
> 'patchy' look, surprisingly, although the effect is then just gray-scale.
> 
> Btw, I did try my idea of making the card images as 3-color 'rough-outline
> blobs' instead of concentric circles; but I cannot really tell if this alters
> the look of the individual patches. If it does, it is only a very subtle change.
> 


A very interesting effect!

Paolo


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From: Kenneth
Subject: Re: Happy Halloween 2020!
Date: 4 Nov 2020 19:25:06
Message: <web.5fa2ffd943ae5363d98418910@news.povray.org>
Paolo Gibellini <p.g### [at] gmailcom> wrote:

>
> A very interesting effect!
>
> Paolo

Thanks.

I am doing some further experiments, to determine how far away the radiosity
'cards' should be, from the scene's objects. This has a big effect on how
'colorful' the radiosity patches are. There is a certain 'range' of distance
where the scene looks the most colorful, with a minimum of unwanted artifacts.
(Of course, this crazy radiosity effect is one big 'artifact', ha.)


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