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On 11/3/19 1:31 PM, jr wrote:
> hi,
>
> William F Pokorny <ano### [at] anonymous org> wrote:
>
> yes, 'df3util' can import PNG, either as grayscale or _one_ of RGBA, so I don't
> see/use colours at that stage. :-( still, I'd like to understand better the
> way you outlined in the previous post, ie using a third cam to post-process the
> two perspective cams slices (iiuc).
>
...
What I had in mind was to create two pigments which are planar image
maps of say sliceDown00.png and sliceUp00.png, respectively. Call these
PigDown and PigUp. (You might need to rotate/scale to align with the
final orthographic camera - max_extent() can grab the input image x,y
size)
Wrap these two pigments in functions (only way they'll get used):
#declare FnDown = function { pigment { PigDown } }
#declare FnUp = function { pigment { PigUp } }
Use these in the use_defined the PigmentMaxUpDownPerspective I mentioned
previously and use that texture with ambient 1 or emission 1 (diffuse 0
use no lights) to texture a plane. Place this plane in front of an
orthographic camera and render to get your real sample taking the max
r,g,b values for each pixel from the down, up slices. This third render
is your slice00 sample. Here we are using POV-Ray as an image processing
tool. Something at which it's very good - if not as fast as dedicated
image processing tools.
FYI. There might be typos in my SDL, I didn't set up a small scene as I
often do.
Bill P.
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