[vtkusers] vtkImageActor

[David Gobbi]

Setting the DisplayExtent does not resize the image, it rather
non-intuitively selects which slice of 3D image to display.  So it
probably isn't the method you want.

The UserMatrix can resize the image (you can use vtkTransform to build
a matrix from rotations, scalings, translations, etc).  But depending
on your application, that might not be what you want to do.  In VTK,
there are generally two ways that you can change the displayed size or
position of an object: you can change the position and zoom of the
camera, or you can change the position and scale of the actor.  So
before you move forward, consider which is better for your particular
application.

On Tue, Sep 17, 2013 at 1:22 PM, Mike Gagnon <mike at gagnon.com> wrote:
> ok thanks I'll do that for its orientation.  But as for the image boundaries
> and resizing the image, is the matrix also the best bet? I am hoping to
> align the image perfectly with the bottom left of the renderer and was
> thinking I could use vtkImageActor::SetDisplayExtent (not getting the right
> results with that).
>
>
>
> On 9/17/2013 3:09 PM, David Gobbi wrote:
>>
>> On Tue, Sep 17, 2013 at 12:26 PM, Mike Gagnon <mike at gagnon.com> wrote:
>>>
>>> Hi,
>>>
>>> I'd like to display a bitmap in my renderer - so I do the following:
>>>
>>>      m_pImageActor = vtkImageActor::New();
>>>      m_pBMPReader = vtkBMPReader::New();
>>>
>>>      m_pBMPReader->SetFileName(strPath.c_str());
>>>      m_pImageActor->SetInput(m_pBMPReader->GetOutput());
>>>
>>>      m_pRenderer->AddViewProp(m_pImageActor);
>>>
>>> The image is added, but I don't know what call I need to orient the image
>>> and position it...  Can anyone help with this?
>>
>> I strongly recommend using the actor's SetUserMatrix() method.
>>
>>   David
>
>
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