I got it. Thank you very very much. But I confused with the Ray struct.
What I want is the ray intensity. Could you please tell me how can I get it?
Thanks a lot
Best Regard
Wu Yang

"Christopher James Huff" <chr### [at] maccom> wrote in message
news:chr### [at] netplexaussieorg...
> In article <3dab845d@news.povray.org>, "Wu Yang" <wya### [at] cswrightedu>
> wrote:
>
> >    Yes, I want the output image data. What is the difference between the
> > output image data with the reflection data?
> >    The following is what I want to do:
> >    Suppose I put a radar in the camera position. Because the radar emit
the
> > electromagnetic wave, so it also likes a light source. I want the data
back
> > to the radar, that is to say, the camera position. I think that this is
the
> > same data which I can see by render some pov file(output image data,
> > right?).
>
> Ok, I think this is where our miscommunication is happening. When people
> speak of "reflection", they usually mean specular reflection, like a
> polished surface or a mirror. You seem to be looking for diffuse
> reflection, which is light scattered in all directions by a surface.
> If you want diffuse reflection data per ray, you should modify Diffuse()
> in lighting.cpp. Maybe Diffuse_One_Light() too, I haven't looked very
> closely. If you just want the output image data, why not just use the
> output image?
>
> --
> Christopher James Huff <cja### [at] earthlinknet>
> http://home.earthlink.net/~cjameshuff/
> POV-Ray TAG: chr### [at] tagpovrayorg
> http://tag.povray.org/

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