On 09/19/2016 02:47 PM, Doctor John wrote:
> On 19/09/16 17:35, William F Pokorny wrote:
>> Uses new potential pattern and the not yet merged density{image_map{}}
>> feature of pull request #82.
>>
>> Bill P.
>>
> Interesting, Bill. This looks suspiciously like what I was trying (and
> failing) to do with my FieldCam macro. I had guessed that playing with
> PoV source was necessary but didn't trust my coding abilities.
> Well done
>
> John
>
Thanks John. If I somewhat remember, you were trying to implement a new 
camera type in SDL which is considerably harder.

What is done here is neat, but it's a post processing trick based upon 
using an input image as 3D media.

I was originally thinking of this image->density{}->media{} path in 
POV-Ray as a better color alternative to the many-images to three color 
df3 technique Stephen and Thomas are implementing for their Dragon Lady 
work. It is a variation of a technique that's long been used for clouds.

Thomas on seeing an earlier image->media proposal over in 
unofficial.patches made the comment, "That would be interesting and 
useful indeed" which got me thinking about more than a replacement for 
the image to df3 media method.

What might we be able to do, if we think about accomplishing image 
effects & processing by function/pattern control of image based 3D 
media(s) in addition to the usual techniques with layers and direct 2D 
data manipulations?

Attached is a camera in-motion blurring effect that just happens when 
using a small angle (3 deg) perspective camera and the image as 3D 
media.

Bill P.

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