@@@(light source)
     \        \
      \        \
     [======] a \
        \        \
         \        \
     [========]b [========]c
           \        \
            \        \
             \        \
              \        \
               \        \
                \        \
                 @@@ (camera)

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.
Thanks a lot!

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