[vtkusers] vtkImageReslice + Axes directions

[Mohamed Ben Reguiga]

Hello all,
my problem is quite simple I think and obvious for people familiar with the vtkImageReslice class, whitch is not my case.
In my project I've implemented the multiplanarreconstitution (MPR) from a stack of CT and MRI images.
for that I've done like fllows :
vtkStructredPoints * data = vtkStructredPoints::New();
....
vtkLookupTable *LkTbl= vtkLookupTable::New();
....
vtkImageMapToColors *sagitalColors = vtkImageMapToColor::New();
sagitalColors ->setInput(data);
sagitalColors setLookupTable(LkTbl);
vtkImageActor *actr = vtkImageActor ::New()
actr->setInput(sagitalcolors->GetOutpu);
actr->SetDisplayExtent( 15,15, 0, 511,0,300) //example to show the 15th slice of a stack of 300 images , each one has 512 pxls wdth and hght
render->addActor(actr);
rederWindow->render();
..
this method shows only perpendicular slices as written in documentation of the vtkImageActor.
Now I want to be able to give imges of not orthogonal slices (doing some deviation of nbDgrees arround one of the three axes X, Y or Z).
I've read that vtkImageReslice is able to make that, and I have to specify cosines of the axes (X, Y and Z) but I don't Know how to calculate the new cosines?
if I have a deviation of the X plan and the Y plan of 30° each one  arround the Z axe, how can I calculate the new cosins of these two axes ???
(all the image used are DICOM images)
please help me, 
thank you.

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