Thank you so much for the quick answer, Peter!

I managed to solve my translation issue. 
Regarding the other question, I will investigate this setFAmap. If I dont 
manage to get this working I will come back to you.

Best regards,
Miguel
 
 
On Wednesday, October 15, 2014 11:03 CEST, Peter Neher 
<[email protected]> wrote: 
 
> Hi Miguel,
> 
> MITK always uses world coordinates for the fiber points. Thus, no 
> transformation is needed and the matrix is set to identity. The bounding 
> box of the fibers is different from the image bounding box since the 
> fibers don't necessarily have to occupy the same volume as the image 
> they were obtained from.
> 
> Regarding your second question, the fiber colors are calculated in the 
> FiberbundleX class. The default orientation colorcoding is calculated in 
> DoColorCodingOrientationBased() and a custom color coding, e.g. FA based 
> color coding, is done in the method "SetFAMap" of the FiberBundleX.
> 
> I hope that helps!
> 
> Cheers,
> Peter
> 
> On 14.10.2014 18:18, Miguel Nunes wrote:
> > Hello MITK List,
> >
> > I am having a interesting problem. I am loading a Track file (trk) and the 
> > respective accompanying MR datasets and segmentations.
> >
> > After loading the datasets, all datasets are correctly aligned in the 
> > stdmultiwidget.
> >
> > But for my plugin I need to access the transformation between the datasets 
> > and I cannot achieve this. There is always some miss calculations. For 
> > example, if I ask the geometry3D for the bounding box of the dataset, it 
> > gives me different values comparing to when I get these values from the 
> > vtkPolyData inside the mitkFiberBundleX. The two returning BB are not the 
> > same.
> >
> > When I check the details of the Fiber dataset, it is only shown an identiy 
> > matrix and the BBox, without any transformation. But the BBoxes of the 
> > track and the MR image are different. So, how does MITK align them?
> >
> > Also, I do not understand how the colors of the fibers get rendered. As far 
> > as I have found there is only a 
> > fib->SetColorCoding(mitk::FiberBundleX::COLORCODING_CUSTOM) (and similar) 
> > which leads me nowhere. the render functions of geometry only lead me in 
> > circles...
> >
> > Thank you!
> >
> > Best regards,
> > Miguel Nunes
> >
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> -- 
> Dr. sc. hum. Peter F. Neher
> Division Medical and Biological Informatics
> Junior Group Medical Image Computing (MIC)
> 
> German Cancer Research Center (DKFZ)
> Im Neuenheimer Feld 280
> 69120 Heidelberg
> Germany
> phone: +49 6221 42-3552
> fax:      +49 6221 42-2345
> 
> [email protected]
> http://www.dkfz.de/de/mbi/people/Peter_Neher.html
>   
>   
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