problem with file vtk

[Lorenzo Marta]

Hi everyone, I'm having problems with the interface between ParaView and vtk.
(I'm working with macOS operating system on mac with M1 processor)
In particular, starting from 2 files, meshR.vtu and Dxx.mhd, I have to build a third meshDxx.vtu which associates the values of the tensor built in Dxx.mhd to the meshR.
Following a guide given to me, I ran the following command:

`(base) Mac:Anima_data lorenzomarta$ vmtk myvmtkmeshDlabeling.py -ifile meshR.vtu -diffusionmapfile Dxx.mhd -diffusionarray "Dxx_labels" -ofile meshDxx.vtu`


and I get the following output:



```
Automatic piping myvmtkmeshDlabeling
Parsing options myvmtkmeshDlabeling
    MeshInInputFileName = meshR.vtu
    DiffusionMapInputFileName = Dxx.mhd
    DiffusionArrayName = Dxx_labels
    MeshOutOutputFileName = meshDxx.vtu
Explicit piping myvmtkmeshDlabeling
Input myvmtkmeshDlabeling members:
    Id = 0
    Disabled = 0
    MeshIn = None
    MeshInInputFileName = meshR.vtu
    DiffusionMap = None
    DiffusionMapInputFileName = Dxx.mhd
    DiffusionArrayName = Dxx_labels
    Correction = 0
    Radius = 9
    OnlyNegatives = 0
    MeshOutOutputFileName = meshDxx.vtu
Reading VTK XML mesh file.
ERROR: In ../IO/XML/vtkXMLReader.cxx, line 271
vtkXMLUnstructuredGridReader (0x7f860bf29ac0): Error opening file meshR.vtu

ERROR: In ../Common/ExecutionModel/vtkExecutive.cxx, line 784
vtkCompositeDataPipeline (0x600003f88000): Algorithm vtkXMLUnstructuredGridReader(0x7f860bf29ac0) returned failure for request: vtkInformation (0x600001192280)
  Debug: Off
  Modified Time: 136
  Reference Count: 1
  Registered Events: (none)
  Request: REQUEST_INFORMATION
  ALGORITHM_AFTER_FORWARD: 1
  FORWARD_DIRECTION: 0



Spacing 0.449219 0.449219 0.900000
Origin -105.647736 -123.984390 -68.281136
Dimensions 448 512 176
Executing myvmtkmeshDlabeling ...
Creating points location array
Assigning diffusion values to tethraedrical mesh
---Negative diffusion values found when mapping to 3D mesh:  0
---Null diffusion values found when mapping to 3D mesh:  0
Done executing myvmtkmeshDlabeling.
Writing VTK XML mesh file.
Output myvmtkmeshDlabeling members:
    Id = 0
    MeshOut = vtkUnstructuredGrid
````

I

 don't understand what the 2 errors that pop up depend on.
The meshDxx.vtu file in paraview does not allow me to view anything and gives me an error signal.

[Andras Lasso]

VMTK support has moved to the VMTK forum at https://discourse.slicer.org/c/community/vmtk. If you still need help with this question you can post it there.

Andras