[vtkusers] Visualize a volume slice on a 3D plane (the acquisition plane of the images)

[Shashwath T.R.]

Hi,

If I’m not mistaken, you should be able to use the output of vtkImageMapToColors - that’s a 3 component char * image.

Shash

> On 27-Jun-2018, at 7:18 PM, Eva Monclús <emonclus at cs.upc.edu> wrote:
> 
> Thanks a lot for the quickly answer, but my problem is that I want to use the output of the vtkImageActor in a different graphic object (another 3D plane) and I do not know how to manage it. 
> In very, very technical words, I want to get access to the unsigned char * that it is being rendering using the vtkImageActor.
> 
> Thanks in advance,
> 
>     Eva
> 
> 
> 
>> On 27/06/2018 15:22, Sankhesh Jhaveri wrote:
>> Hi Eva,
>> 
>> vtkImageActor is a 2D textured plane in a 3D space. Make sure that you use the vtkImageMapper3D (default mapper) with it.
>> If you’re just looking for 3D interaction with the actor, use an interactor style like vtkInteractorStyleTrackballCamera.
>> 
>> Hope that helps.
>> 
>> Thanks,
>> Sankhesh
>> 
>> 
>>> On Wed, Jun 27, 2018 at 9:17 AM Eva Monclús <emonclus at cs.upc.edu> wrote:
>>> Hello everyone,
>>> 
>>> I'm working with a volume dataset (temporal Dicom serie) and I´m able to visualize the  slices using the following vtk C++ classes:
>>> 
>>> vtkImageData: represents the volume dataset
>>> vtkImageMapToColors: I use this class to define the transfer function to be used in the rendering
>>> vtkImageActor: I use this class to render a specific slice of the volume dataset  
>>> Until here everything it is fine. I can render the slice I want using the classes before mentioned changing the SetDisplayExtent of the vtkImageActor.
>>> 
>>> Now I want to visualize the output of my vtkImageActor as a 2D texture in a free 3D plane.  Then, I consider to have the following classes:
>>>  I use a vtkPlaneSource to define the  3D plane: orientation and position
>>> a vtkTexture that has to be attached to the vtkPlaneSource. My problem comes out with the definition of the SetInputConnection of the vtkTexture. I want to define the  image as the output of the vtkImageActor. But  I do not get it.
>>> I am successful in visualizing the vtkPlane in black  color (due to the texture is not well defined) unfortunately, I can't get it to work properly  with a texture of a specific slice of the volume dataset. I have tried different ways of assigning the SetInputConnection of the vtkTexture using the vtkImageActor, but none of them worked well.  
>>> 
>>> Any help will be welcome.  Thank you very much in advance,
>>> 
>>>    Eva
>>> 
>>> 
>>> 
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>> -- 
>> Sankhesh Jhaveri
>> 
>> Sr. Research & Development Engineer | Kitware | (518) 881-4417
>> 
> 
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