[vtkusers] how to get 3D rending together dicom image with drawing contous

[pp]

Hi,

I have get 3D display using vtkFixedPointVolumeRayCastMapper for CT dicom images. I also have several drawing contours from CT dicom images. I use vtkVoxelContoursToSurfaceFilter to get 3D display about drawing contours. I want to get 3D display together dicom image with drawing contours in the same vtkRenderer. But the 3D display of drawing contours is not in the correct position in 3D display of ct dicom images. x, y position is ok. z position is not correct. 
So what shall I do? Is there some examples to do this ?


Thank you very much!
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