> Can POV get a render picture of  physical meaning such as radiance ?Or POV only
> get a picture having nothing  physical meaning in it ?I have got a picture by
> pov,but I donot know what physical meaning in it?
>
>

POV-Ray is not intended to generate images that have physical "meaning", 
but ones that are physicaly acurate.

If you want some "meaning" like radiance, you should use *.HDR or *.RAD 
format as your output. Those are high dynamic range image format where 
the RGB values are stired as floats. You absolutely need to use the 
version 3.7 to have access to those formats.

If you use "normal" image format, you can get some clipping for very 
dark (to zero) and bright (to one) regions.
Using the PNG format, you can have up to 16 bits per channel. This allow 
for much finer granulosity in the brightness.
A possibility could be to get some "expanded" dynamic range by dividing 
your illumination by some factor, like by 256 and get the equivalent of 
the regular render in the lower 8 bits and the brightest areas having 
non-zero values in the top 8 bits...


Alain

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