Among onther things, myself wrote:

> 3 looks somewhat distorted... there
> must be something I didn't take into account. It's also clipped, because
> the "photodetector camera" was not wide enough to capture light from every
> possible direction. And it's too noisy, that could be due to incomplete
> antialiasing.

I meant "2", I had to change the numbering because knode sorts the
attachments alphabetically...

Anyway, there was something missing, when creating the reference image, the
light should be projected through the same view field the camera has in the
primary image, here is the corrected "reference.png", much more similar to
"reconstructed.png"

-- 
light_source{9+9*x,1}camera{orthographic look_at(1-y)/4angle 30location
9/4-z*4}light_source{-9*z,1}union{box{.9-z.1+x clipped_by{plane{2+y-4*x
0}}}box{z-y-.1.1+z}box{-.1.1+x}box{.1z-.1}pigment{rgb<.8.2,1>}}//Jellby

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Download 'reference.png' (4 KB)

Preview of image 'reference.png'