Am 27.08.2014 09:57, schrieb CAS:
> 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!

If I understand you correctly, what you want (or part of that) is an 
image where all illuminated surfaces are 100% white and all shadowed 
surfaces are 100% black.

To achieve this, use a "rgb 1" pigment and a "diffuse 1 brilliance 0 
ambient 0" finish.

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