andy Wang <wjg### [at] yahoocomcn> wrote:
> as shown in the figure,planes b and c are shaded.my question is how to different
> the b and c planes at the pov's result image.

  Sorry, even after reading that paragraph several times, I just can't
understand it. (I would honestly like to answer your question, but I just
can't understand what it is.)

-- 
                                                          - Warp

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