[vtkusers] How to understand the slab thickness, slab resolution, spacing

[David Cole]

vtkImageData is a regularly spaced collection of *point* samples,
there is no "thickness"...

Please refer to the classic "A Pixel Is Not A Little Square" :
http://alvyray.com/Memos/CG/Microsoft/6_pixel.pdf

Also, a shorter summary here:
http://graphics.cs.wisc.edu/WP/cs559-fall2014/2014/08/29/what-is-a-pixel-and-what-is-a-point-sample/


HTH,
David C.



On Wed, Aug 2, 2017 at 10:39 AM, zhang qiang <zhang07101 at 126.com> wrote:
> Dear David:
>
>      Thanks a lot. And the vtkImageData also do not record the thickness
> information. I wonder why VTK ignore the thickness information? I think the
> thickness information is quite important for DICOM image. My guess is that
> we can not obtain the image whose thickness is 0.4 from the image whose
> thickness is 0.8. So,  the thickness information is useless in vtkImageData?
> Am I right?
>
> zhang qiang
>
>
>
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