[IGSTK-Users] Get dimensions from igstkImageSpatialObject

[Torleif Sandnes]

Thanks for your reply.

> If you are doing volume rendering, that functionality will presumably
> be implemented in an igstk::ImageSpatialObjectRepresentation class.

Well, I will probably have to inherit from igstkSpatialObject and  
mirror some functionality from ImageSpatialObject. None of the  
methods in igstkImageSpatialObject is virtual.

>    Inside this class, you can have access to the vtkImageData.
>
> We should not expose image information outside of IGSTK components.

AFAICS, RequestGetItkImage() and RequestGetVtkImage() is public in  
igstkimageSpatialObject.
(http://public.kitware.com/IGSTK/NightlyDoc/ 
classigstk_1_1ImageSpatialObject.html)
So, I would probably be able to do this outside of IGSTK if I really  
wanted to?

> Do you have your volume rendering class in the IGSTK Sandbox ?
No, I am just using a modified version of the  
igstkImageSpatialObjectVolumeRepresentation from the DeckOfCardRobot  
example.

> We could guide you on how to gain access to the vtkImageData,
> and still remain inside the IGSTK walls. The process should be
> very similar (if not identical) to what is done in the file
>
>    igstkImageSpatialObjectRepresentation.txx

True, I had a look and I think I should be able to get access to what  
I wanted.

Btw, looking through the igstkImageSpatialObjectRepresentation class,  
I see that all images are converted to unsigned char because of a  
restriction in vtkImageActor. Next, a vtkImageMapToColors is used to  
set window width and level. Could it be something here that results  
in the problems we have getting good representation of MR images? CT  
images are looking good. ( Attached a screenshot. igstk application  
to the left, osirix to the right. Window level 1011, window width:  
2319 in both applications.)

Regards,

Torleif
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