> Requirements:
> pov2,Raytracing the scene with all diffuse surface reflectances set to unity and
> no
> ambient reflectances resulted in a 8-bit shading image Shade(x,y).
>
> pov3,Generate a POV image NoShade(x,y) with the option of turning off mutual
> shadowing between objects. The shadow map (0 for shadow and 1 for illumination)

> of NoShade(x,y) is shown in Fig.2 on the right.
>
> This pov2.pov is the same as pov3.pov,and the only difference is pov3.pov
> consider the shadow of the objects themselves,not consider the mutual shadow
> between objects.pov3.But I have a confuse:the difference map which is the result
> of test3 minus test2 should be 0 or 1.However my difference map contains other
> values apart from 0 and 1.
> I do this two tests in order to judge the difference map pixel is in shadow or
> in light.I want the output images differential is either 0 or 1, but the results
> are not only 0 and 1,and also contain other results.Obviously it is wrong.Maybe
> something wrong in test3 about turning off mutual shadow between objects.My
> codes have uploaded,I beg somebody help me have a look and resolve this
> problem.Thank you!
>

   I think the result is correct... you are getting a value >0 where 
pixels are different, so



   will give you the correct result... did you notice the >0 at the end?

--
jaime

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