[vtkusers] vtkImagePlaneWidget: interpolated cursor position

[John Hunter]

>>>>> "David" == David Gobbi <dgobbi at imaging.robarts.ca> writes:

    David> Hi John, There is a way to do this indirectly by using
    David> vtkImageReslice to interpolate a single voxel from the data
    David> set:

Hi David -- thanks for the response.  Sorry to be dense here, but it's
not clear to me what x, y, z are in your example

    reslice = vtkImageReslice()
    reslice.SetInput(data)
    reslice.SetInterpolationModeToLinear()

    reslice.SetOutputOrigin(x,y,z)
    reslice.GetOutput().SetUpdateExtent(0,0,0,0,0,0)
    reslice.GetOutput().Update()

    value = reslice.GetOutput().GetScalarComponentAsFloat()

I have ready access to the x, y display coords of the pointer in the
viewport, and the x,y,z coords of the vtkImagePlaneWidget cursor.  But
the latter are voxelated.  What in your example above provides the
information to interpolate within the voxel?

Could you elucidate?

Thanks,
John Hunter