[vtkusers] Re: vtkImageMapper and GetWholeZMax() question

[Anja Ende]

Ok, upon looking into the vtkImageMapper class, the values are produced by
calling the GetWholeExtent() on the input.

The values returned by it are:

XY: 0, 255:0, 255:0, 119
YZ: 0, 199:0, 186:0, 199
XZ: 0, 199:0, 186:0, 199

Now, what exactly is the difference between the different extents... I
thought the extent would be the dimension of the object...

Please enlighten me!

Thanks,
Anja


On 29/08/06, Anja Ende <anja.ende at googlemail.com> wrote:
>
> Hi everyone,
>
> I have a question about the vtkImageMapper class and the GetWholeZMax()
> function.
>
> I have an input volume of the following dimensions:
>
> x = 256 .
> y = 256
> z = 120.
>
> When I use the vtkImageViewer to display the data in the X, Y plane it
> returns 120 as the number of Z slices available for display.
>
> However, in the YZ and the XZ plane the number of Z slices is 199 (200). I
> actually thought it should be 255. I was wondering if someone can explain to
> me how exactly this calculation is done...
>
> Thanks,
>
> Anja.
>
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