[vtkusers] Molding an image slice

[David Gobbi]

Note: if you get a warning when you click the link to the example, try
again without https:
http://www.vtk.org/Wiki/VTK/Examples/Cxx/Visualization/TextureMapPlane

On Tue, Mar 21, 2017 at 7:10 AM, David Gobbi <david.gobbi at gmail.com> wrote:

> Here is an example of applying a texture map to a plane (the warping step
> would have to be added).
> https://www.vtk.org/Wiki/VTK/Examples/Cxx/Visualization/TextureMapPlane
>
> To properly set up the vtkPlaneSource to match the image geometry, it
> would be necessary to use these methods:
> plane->SetResolution(xdivs, ydivs);
> plane->SetOrigin(<coords of image corner (0,0)>)
> plane->SetPoint1(<coords of image corner (1,0)>)
> plane->SetPoint2(<coords of image corner (0,1)>)
>
> On Tue, Mar 21, 2017 at 6:54 AM, David Gobbi <david.gobbi at gmail.com>
> wrote:
>
>> Hi Shark,
>>
>> I think the most efficient option would be a vtkTexture on a
>> vtkPolyData.  You can use vtkPlaneSource to make a polydata that has as
>> many points as your image has pixels.  If necessary, you can
>> use vtkTransformTextureCoords to tweak the texture coords.
>>
>> Then you can use e.g. vtkGridTransform or vtkBSplineTransform with
>> vtkTransformPolyDataFilter to warp the plane, or perhaps vtkWarpVector.
>>
>> Regards,
>>  - David
>>
>>
>> On Tue, Mar 21, 2017 at 6:26 AM, Shark <m.nunes at fratoria.com> wrote:
>>
>>> Hello,
>>>
>>> I have been trying for some days to "mold" a 3D image slice. (imagine a
>>> towel in the wind)
>>>
>>> What I mean is that I have a 2D slice, extracted from a 3D vtkImageData,
>>> and
>>> one 3D vector for each pixel of the slice. I want to
>>> translate/transform/move each pixel from the 2D slice to a 3D position
>>> (and
>>> augmenting the extent of the 2D slice in x,y,z when necessary) while
>>> keeping
>>> these pixel stitched together. I believe my knowledge of all VTK filters
>>> is
>>> not that great, so I think something is already implemented for this,
>>> but I
>>> cannot find it.
>>>
>>> Currently, my line of thinking is: create an unstructured grid, apply the
>>> vectors transformation, create a new vtkImageData from this
>>> transformation
>>> and map the pixel values through ids (cell IDs? point IDs? ).
>>>
>>> In the end I would see a slice stretched, compressed and bent up, down
>>> and
>>> to the sides.
>>>
>>> Thank you!
>>> shark
>>>
>>>
>>
>
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