Hi,
  Thank you for your reply. You message is very helpful for me. In your
letter, you mentioned some C++ files and functions. Would you please inform
me where I can find them.
Thanks
Wu

"Christopher James Huff" <chr### [at] maccom> wrote in message
news:chr### [at] netplexaussieorg...
> In article <3d8a59e9$1@news.povray.org>,
>  "Wu Yang" <wya### [at] cswrightedu> wrote:
>
> >   I am a new user of pov-ray. I want to know how to get the reflection
data
> > which are used to form the scenes.
>
> Well, my first thought is that you don't understand how POV does
> reflections. When a ray hits a reflective surface, POV computes the
> direction it would reflect off in from the intersection point and
> normal, and the incoming ray direction and origin. It then starts
> tracing another ray in the reflected direction, and uses the color
> computed along that ray as the reflected color. There isn't any
> "reflection data", just a lot of rays. It sounds like you might be
> looking for environment map data, POV doesn't use environment maps, it
> uses raytracing to compute true reflections instead.
>
> You could hack in a bit of code that writes all reflected rays to a
> file, I don't know if that would be of any use to you. The function to
> modify would be Reflect() in lighting.cpp. Or you could do it at a lower
> level and modify Trace() in render.cpp to output data for every ray
> traced.
>
> --
> 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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