Jaime Vives Piqueres <jai### [at] ignoranciaorg> wrote:

> > I am a student.Recently I need to do three tests about POV. And I have done
> > three tests,but I do not know whether they are right.I beg a hot help me check.
> > Requirements:
> > 1,Raytracing the scene using no illumination source and distinct color settings
> > for each object representing different materials results in an image which can
> > be converted to a materials map M(x,y) by simple classification of the red,green
> > and blue channel images produced by the raytracer.A sample is shown in Fig. 2 on
> > the left.
> > 2,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). A sample is
> > shown in Fig. 2 center.
> > 3,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.
> > I have done three tests.Beg somebody have a check .Besides,about the third
> > test,I could not find the option of turning off mutual shadowing between
> > objects.So the result is the same as test 2.I know something wrong with
> > test3.How can I modify my codes?Whether codes about tests meet above three
> > requirements?beg a hot .Great gratitude and best wishes!
>
>    I've no idea what all this is about, but if your problem is disabling
> the shadowing, just ad "no_shadow" to your objects, as it has been said
> already.
>
> --
> jaime

Test2 is the same as test3,and the only difference is test3 consider the shadow
of the objects themselves,not consider the mutual shadow between objects.Test3
added noshaow in objects.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(the above code is wrong,download this one),I beg somebody
help me have a look and resolve this problem.Thank you!

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