Thank you for your reply.
  I think that "Colour" is the key element in forming a camera image, while
"Intensity" is the key element in forming a radar image. And intensity is a
parameter of colour. I am not sure that if these two intensities is the same
one. In light.cpp file, I found intensity variable in several functions and
it is used to calculate the colour of a object. I thought that this maybe
what I need, but I do not know the owner of this intensity,that is to say,
which point have this intensity(this is what mapping means). Maybe not
right, please give me some advice. Thanks a lot.

Best Regard
Wu Yang


 "Christopher James Huff" <chr### [at] maccom> wrote in message
news:chr### [at] netplexaussieorg...
> In article <3db020e0@news.povray.org>, "Wu Yang" <wya### [at] cswrightedu>
> wrote:
>
> >   I have found the DBL variable intensity in do_diffuse(), do_irid(),
> > do_phone(), do_specular() functions in lighting.cpp file. I think this
is
> > what I need. But I can not find the point mapping to this intensity.
Could
> > someone help me to find it? Thanks a lot.
>
> There is no "point mapping". There is also no "intensity" variable
> except for in do_irid(), though there is a "Intensity" in the others. It
> is just a variable to hold data for the calculations, the same name just
> happens to be used in several functions. For example, in do_diffuse(),
> it is the brightness of the light reflected along the ray from a light
> source. In do_irid(), it is a scaling factor for the intensity of the
> iridescence effect.
>
> --
> 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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