[vtkusers] Problem rotating vtkImageSlice

[David Gobbi]

Check the extent of the input image to make sure all of the slices were
loaded.

On Sun, Aug 28, 2016 at 12:37 PM, Richard Frank <rickfrank at me.com> wrote:

> Hi David,
>
> Sorry about the attachment.
>
> Well, I'm pretty far along with my work on this, so I'd like to try the
> vtkPlane orientation as a solution if possible.
>
> using the example code,  If I create a vtkPlane, set its origin to 0,0,0
> and set its normal to 1 0 0 (instead of 0,0,1) and call
>  imageResliceMapper->SetSlicePlane(plane);
>
> I see a thin line. Seems correct. If I change the interactor style to
> Trackball camera, and rotate the camera around it seems the image is only 1
> unit wide however.
>
> Is there something else I need to do to get the image to map to a plane
> with different orientation?
>
> THanks
> Rick Frank
>
> On Aug 28, 2016, at 12:51 PM, David Gobbi <david.gobbi at gmail.com> wrote:
>
> Hi Frank,
>
> It looks like you are doing a data transformation when you should be doing
> a view transformation.  Don't rotate the actor if your goal is to rotate
> the view.  When you rotate the actor, you are changing the relationship
> between data coordinates and world coordinates.
>
> If you want a sagittal view, then you can rotate the view by moving the
> VTK camera.  The mapper has a method SliceFacesCameraOn() that can be used
> to make the mapper automatically extract a slice in the correct orientation.
>
> Also, please limit the width of inlined images to around 1000 pixels or
> less.  Large inlined images make your email hard to read on my system (I
> wish that gmail would auto-shrink oversized inlined images, but
> unfortunately it displays them full-size, even if they're several times the
> size of the display).
>
>  - David
>
> On Sun, Aug 28, 2016 at 9:56 AM, Richard Frank <rickfrank at me.com> wrote:
>
>> Hi David,
>>
>> Thanks for the reply. I'm still a bit confused about what I've tried and
>> why it doesn't work....
>>
>> So, I have 3 slice views and in the screenshot the Axial View is lined up
>> appropriately (image position patient is in the correct place, and each
>> slice is in correct place etc) with the world coordinates by using the
>> image reslice axis and camera etc to align the DICOM coordinates and the
>> VTK World coordinates.
>>
>> I now want to orient the sagittal slice so that it aligns with the world
>> coordinates.
>>
>> (see screen shots)
>>
>>
>> I believe I need to rotate the slice (if I could rotate the actor) about
>> Z 90 CCW and then about its new X 0- degrees and then move the camera about
>> world Y 90 and the roll the camera 90 to get the sagittal voxels DICOM
>> aligned with the World Coordinates.
>>
>> I tried various parameters for the resliceMapper->SetSlicePlane() but the
>> slice just dissapears off screen somewhere so I must be getting sometime
>> wrong.
>>
>> How would I use the SetSlicePlane to achieve this?
>>
>> Thanks
>>
>> Rick
>>
>> On Aug 27, 2016, at 02:51 PM, David Gobbi <david.gobbi at gmail.com> wrote:
>>
>> You should also try vtkImageSliceMapper instead of vtkImageResliceMapper,
>> perhaps its behavior will better suit your requirements.
>>
>>
>> On Sat, Aug 27, 2016 at 11:51 AM, David Gobbi <david.gobbi at gmail.com>
>> wrote:
>>
>>> Hi Rick,
>>>
>>> You're seeing this because you are doing an out-of-plane rotation on an
>>> image that has only one slice.  The rotation is around the image origin,
>>> which (in this case) is at the bottom-left corner of the image.
>>>
>>> The vtkImageResliceMapper has a SetSlicePlane() method:
>>> http://www.vtk.org/Wiki/VTK/Image_Rendering_Classes#vtkImage
>>> ResliceMapper
>>> You must rotate this SlicePlane when you rotate the vtkImageSlice.
>>>
>>>  - David
>>>
>>>
>>>
>>> On Sat, Aug 27, 2016 at 10:54 AM, Richard Frank <rickfrank at me.com>
>>> wrote:
>>>
>>>> Hi,
>>>>
>>>> If I build the example
>>>>
>>>> VTK/Examples/Cxx/Images/ImageSlice
>>>> and add
>>>>
>>>>  imageSlice->RotateX(1);
>>>>
>>>> Which should, I think, rotate the image actor about its X axis by 1
>>>> degree, I instead get
>>>>
>>>>
>>>>
>>>> which seems incorrect.
>>>>
>>>> I can rotate about Z.
>>>>
>>>> Is there something I'm not doing correctly, or is this a bug?
>>>>
>>>> I also tried RotateWXYZ(1,1,0,0) and get the same result.
>>>>
>>>> This is VTK 7
>>>>
>>>> Thanks
>>>>
>>>> Rick
>>>>
>>>>
>>>>
>>>
>>
>
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