[vtkusers] Correct coordinate transformations for DICOM data set.

[David Gobbi]

Hi Vipul,

For the default position of the VTK camera,

X points right
Y points up
Z points out of the screen

So, yes, if one simply tries to slap a DICOM image up on
the screen with VTK, it will be displayed with the wrong
orientation.  After all, VTK is a general-purpose graphics
library, so its default settings are not tuned specifically
for DICOM.

Setting up the camera properly, so that you get the desired
view of your data, is a must.

 - David

On Thu, Aug 21, 2014 at 11:14 AM, Vipul Pai Raikar <vpai at g.clemson.edu> wrote:
> Hello Dr Gobbi,
>
> Well as you explained, I implemented the solution. It works like a charm. I
> agree with you that its quite a few lines of code to get it to work, but it
> indeed helped my better grasp the concept.
> As well as it worked, there was however an issue with the rendering being
> flipped in the Y-direction. I approached this problem by manipulating the
> camera associated with the renderer. I remember from some of your earlier
> posts that I read here, you explicitly advise setting up the camera by your
> self. As a result the rendering is now oriented correctly. I was just
> wondering if this was a normal thing or is the flip the byproduct of
> something else? ; and if this approach is correct.
> I also can now correctly position my tracker data.
>
> best regards,
>
> V
>
>
>
> --
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