scott <sco### [at] scottcom> wrote:
> > Hello,everyone.I am a student.I am doing my graduation project recently.It is
> > simulating radiance with ray-tracing.I have done a test with pov.But I am
> > confronting a error with my result.Could anyboby help me check out my issue.Beg
> > a hot.I am a student.I am confronting the pressure of graduation.I feel so
> > worry.I have uploaded the whole process of my test,beg a hot help me!
> > "pov-xyz"is the location of each sphere.
> > "pov-ref"is the reflectivity of each sphere.
> > "pov.exr"is the output image by pov.
> > I have converted "pov.exr" to "pov.tiff".
> > "result"is my analyse.My issue was wrote in it.
> > Expecting somebody help me.Great gratitudes!
>
> Using a specular highlight on tiny spheres is going to give very
> unpredictable results, the output pixel value will highly depend on
> exactly where the ray hits the sphere compared to the highlight
> position. I zoomed in on your scene and rendered it, see attached, I
> also changed the background colour to red to highlight the spheres
> better. Do you see the problem?
>
> I would use boxes rather than spheres and use diffuse rather than
> specular reflection:
>
>   pigment{color rgb 1}
>   finish {
>    ambient 0
>    diffuse ref
>   }
> }
>
> That should give much more uniform results and not depend on where each
> ray hits the shapes. I don't know if that will solve your problem or not.

I have modified the statements and done a test with your advice.I find the
result changed,but not what I wanted.Besides,I only have 40000 points ,if I used
box as my model, which needs two points to describle,but my input scene is as
"pov.tif".One point stands for one object,corresponding,with a reflectity.If I
used box,may need two point to descible a object,I doublt the scene is not my
wanted.

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Attachments:
Download 'pov.tif.dat' (487 KB)