On 02/10/2018 10:36 PM, Mike Horvath wrote:
> I've been reading this
> 
> https://en.wikipedia.org/wiki/Miniature_faking
> 
> and have been wondering how to achieve the effect in POV-Ray. Obviously, 
> there is no true scale in POV-Ray, so there's no need to "fake" the 
> effect. But I don't know how to construct the correct camera.
> 
> Any ideas?
> 

See:

http://news.povray.org/povray.binaries.images/thread/%3C57e14051%241%40news.povray.org%3E/

for a technique using a not yet adopted parser change which allowed 
image_maps to be used directly in density {} blocks.

Mention it because though our documentation

http://wiki.povray.org/content/Reference:User_Defined_Pattern

doesn't yet disclose it, the new-ish 3.7.1/3.8 pigment { user_defined { 
} } capability was implemented by Christoph in a way so it works for 
density blocks too. Of course only the R,G,B functions do anything where 
used with density {}.

This means it should be possible to implement the tilt shift technique 
in the first reference by building up functions which grab the r,g,b 
channels via #declare Fn... = function { pigment { image_map {...} } } 
and using those functions in two density { user_defined { } } blocks in 
a density_map. It's a more awkward means than using the image_maps 
directly in the density blocks, but it should work.

The technique uses media blending between two densities. One blurred via 
turbulence and one not.

Bill P.

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