"liuyang" <liu### [at] gmailcom> wrote:
> Thorsten Froehlich <tho### [at] trfde> wrote:
> > liuyang wrote:
> > > I need the distance of each pixel to the camera in the rendered scene. Is
> > > there a way to get it in Pov ray? I am doing an experiment to study the
> > > relationship between luminance and distance in natural or simulated world,
> > > so it is really important to know the exact distance and pixel
> > > relationship. Does the z buffer or depth buffer give me this information?
> >
> > Yes it does give you this information, but POV-Ray does not use either
> > because it is a ray-tracer. The same information is still computed, of
> > course, but you would need to modify POV-Ray to extract this information for
> > each pixel.
> >
> >  Thorsten
>
> Thanks, but how to modify Pov-Ray to get it?
>
> Yang

I believe megaPOV has some sort of ability.  One simple way to do it in POV
without a rewrite is rerender your scene with a simple gradient pattern
applied globally to all your objects oriented along the viewing vector.
You can then cross-reference this with the regular render.

-tgq

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