[vtkusers] VS: ÄvtkusersÅ Problem in vtkImageReslice

[Hämäläinen Janne]

Look at Premultiply() and Postmultiply methods of vtkTransform. They can be
used to specify the order of matrix multiplications inside the class.
Remember that the order of the rotations counts, so you have to do the
inverse rotations in reverse order.

-Janne


--
Janne Hämäläinen
Research Assistant
Helsinki University of Technology
Image Processing Center
janne.hamalainen at hus.fi



> ----------
> Lähettäjä: 	CSPL[SMTP:affable at hd2.dot.net.in]
> Lähetetty: 	20. syyskuuta 2003 10:32
> Vastaanottaja: 	vtkusers at vtk.org
> Aihe:  	ÄvtkusersÅ Problem in vtkImageReslice
> 
> Hi all,
>    I have a problem with vtkImageReslice class. It is not rotating the
> image
> data as required.
>    My purpose is to rotate the image data(128x128x35) in 3 axises ( X, Y,
> Z ), then clip the data, and then rotate output data in inverse angles so
> that the image data will be in original position. I have my own code for
> clipping the data. Now the problem is when i rotate the image data in
> inverse direction to get the original position, it is not rotating
> properly.
> It is rotating properly in X-direction. It is not rotating properly in Y
> and
> Z axises i.e. it is not going back to the original position.
>    I am using vtkImageReslice class and vtkTransform to rotate the image
> data. In vtkTransfrom class, i am calling RotateX, RotateY and RotateZ
> function to rotate the image data. Now in which order these angles are
> rotated internally, i mean first of all image data is rotated in X
> direction
> then in Y direction then in Z direction or in the some other order. When
> the
> imaged data is rotated in inverse order it is rotating 10'degree more in Y
> and Z direction. It is not working with all the data set.
> 
>    My purpose is to render the final rotated image data using ISO surface
> volume rendering.
> 
>    I am using VTK4.3 version. Is there any changes in above classes in the
> current version???
> 
>    Please help me in this regard....
> 
>    Thanks in advance.
> 
> -Regards,
>    Sateesh.
> 
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