[vtkusers] Undo vtkImageFlip effects

[David Gobbi]

Hi Marcos,

It might be more convenient to use vtkImageReslice to flip the images.  It
can take a 3x3 or 4x4 matrix that describes the transformation.

For a 3x3 matrix that flips the Y axis, you would use this:

reslice->SetResliceAxesDirectionCosines(
  1, 0, 0,
  0, -1, 0,
  0, 0, 1);

Be careful, though, because this flips the image around the origin, rather
than flipping it around its center.

For a 4x4 matrix, use reslice->SetResliceAxes(vtkMatrix4x4 *).  By using a
4x4 matrix, you can make sure that the correct center-of-rotation is
applied.

 - David


On Mon, Sep 14, 2015 at 11:03 AM, Marcos <fotosentido at gmail.com> wrote:

> Hi,
>
> I attached a vtkImageFlip filter to my pipeline, but I can't find the way
> to "switch off" this filter or revert its effects.
>
> I just want to flip my image when I press a button.
>
> Any suggestions?
> Thank you.
>
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