[vtkusers] get an arbitary oblique slice through volume with vtkImageReslice

[Orlinn]

hallo David,

with vtkImagePlaneWidget you can show the three plane (axial, coronar,
sagittal). I want these three planes and an oblique, so that i can work with
four renderer in the window. 

i will try to implement your version maybe it will solve my problem

thank you
 

David Feng-2 wrote:
> 
> Sorry, I got vtkImageReslice and vtkProbeFilter merged together in my
> head.
> 
> To clarify/correct, you need to supply the orientation of the plane 
> (ResliceAxesDirectionCosines) and a point that passes through the plane 
> (ResliceAxesOrigin).  Also, as the documentation says, make sure you set 
> the output dimensionality to 2.  The orientation is a 3x3 rotation 
> matrix.  That matrix looks like this:
> 
> x1 y1 n1
> x2 y2 n2
> x3 y3 n3
> 
> n is the plane's normal, x and y are vectors orthogonal to n that lie on 
> the plane.  You can make one of these yourself by creating a 
> vtkTransform, applying any rotations you want, and computing the new
> basis:
> 
> M * [1; 0; 0; 1] = x
> M * [0; 1; 0; 1] = y
> M * [0; 0; 1; 1] = z
> 
> For example:
> 
> vtkTransform* t = vtkTransform::New();
> t.RotateX(90);
> double x[4] = {1,0,0,1};
> M.MultiplyPoint(x,x);
> 
> This will store in x the new x vector in the rotated space, in this 
> instance rotate 90 degrees about the x axis. 
> 
> Why doesn't the vtkImagePlaneWidget do what you want?  It is an 
> interactive, arbitrarily orientable, scalable, and window/level-able 
> slice plane.  It even uses vtkImageReslice internally, if I'm not 
> mistaken, so unless I'm missing something there's no need to rewrite it 
> yourself.
> 
> David
> 
> Martin Schmitz wrote:
>> hallo David,
>>
>> thank you for the answer,
>>
>> in the doucumentation of the class vtkImageReslice says :" /Extraction 
>> of slices from an image volume. The most convenient way to do this is 
>> to use SetResliceAxesDirectionCosines() to specify the orientation of 
>> the slice. The direction cosines give the x, y, and z axes for the 
>> output volume./"
>> So i have to use the right transformation matrix to rotate or move the 
>> plane, i don't know if i need the class vtkPlane, what i need is a 
>> class of vtkTransform. I tried with the class  vtkImagePlaneWidget but 
>> it was not that what i need.
>>
>> thank you
>>
>>
>> 2009/10/12 David Feng <dfeng at cs.unc.edu <mailto:dfeng at cs.unc.edu>>
>>
>>     The vtkImagePlaneWidget class will let you interactively
>>     rotate/scale/etc a slice plane through a volume and show you the
>>     results as you go.  I think you just need to click on the
>>     boundaries of the image to start the different manipulations.  You
>>     can get the sliced values out from the widget via
>>     GetResliceOutput(), or something similar.  I think you can set the
>>     position of the plane programmatically as well.
>>     If you want to get dirty with vtkImageReslice, I believe what
>>     you'll need to do is make a vtkPlane and connect it via
>>     SetInputInformation().  The ResliceAxesDirectionCosines allow you
>>     transform the plane (or whatever reslice structure you use) into a
>>     different coordinate space (patient space to world space, for
>>     example).  In your case, it's probably easier to manipulate the
>>     vtkPlane directly.
>>
>>     David
>>
>>
>>     Orlinn wrote:
>>
>>         Hallo everybody,
>>
>>         i want to get an arbitary oblique slice through my volume
>>         data. I found
>>         example which show how to get the axial, coronar and sagittal
>>         slice. I know
>>         that i can use the methode "SetResliceAxesDirectionCosines"
>>         but i don't know
>>         how to set the parameters to get an arbitary oblique slice
>>         throught the
>>         volume.  can anybody help please? i have no idea how to solve
>>         my problem
>>
>>         sorry for my english
>>
>>         thank you
>>            
>>
>>
>>
> 
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