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write_data_to_vtk volume normalization correction #2397

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Merged
shimwell merged 3 commits into from
Mar 7, 2023
Merged

write_data_to_vtk volume normalization correction #2397

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a270d4c
Using vertices property where possible. Correcting volume ordering in…
pshriwise Feb 24, 2023
70b743e
Add test of volume normalization ordering
pshriwise Feb 24, 2023
728f48c
Adding another test that uses VTK to gather the data directly.
pshriwise Mar 1, 2023
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Adding another test that uses VTK to gather the data directly. 
Co-authored-by: Jonathan Shimwell <jonathan.shimwell@firstlightfusion.com>
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@pshriwise @shimwell
pshriwise and shimwell committed Mar 1, 2023
commit 728f48c2aef77fadcabef52fdaae33de0dd9323a
58 changes: 58 additions & 0 deletions tests/unit_tests/test_mesh_to_vtk.py
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Expand Up @@ -91,3 +91,61 @@ def test_write_data_to_vtk_size_mismatch(mesh):
)
with pytest.raises(ValueError, match=expected_error_msg):
mesh.write_data_to_vtk(filename="out.vtk", datasets={"label": data})

def test_write_data_to_vtk_round_trip(run_in_tmpdir):
cmesh = openmc.CylindricalMesh()
cmesh.r_grid = (0.0, 1.0, 2.0)
cmesh.z_grid = (0.0, 2.0, 4.0, 5.0)
cmesh.phi_grid = (0.0, 3.0, 6.0)

smesh = openmc.SphericalMesh()
smesh.r_grid = (0.0, 1.0, 2.0)
smesh.theta_grid = (0.0, 2.0, 4.0, 5.0)
smesh.phi_grid = (0.0, 3.0, 6.0)

rmesh = openmc.RegularMesh()
rmesh.lower_left = (0.0, 0.0, 0.0)
rmesh.upper_right = (1.0, 3.0, 5.0)
rmesh.dimension = (2, 1, 6)

for mesh in [smesh, cmesh, rmesh]:

filename = "mesh.vtk"
data = np.array([1.0] * 12) # there are 12 voxels in each mesh
mesh.write_data_to_vtk(
filename=filename,
datasets={"normalized": data},
volume_normalization=True
)

reader = vtk.vtkStructuredGridReader()
reader.SetFileName(filename)
reader.ReadAllFieldsOn()
reader.Update()

cell_data = reader.GetOutput().GetCellData()
uniform_array = cell_data.GetArray("normalized")
num_tuples = uniform_array.GetNumberOfTuples()
vtk_values = [uniform_array.GetValue(i) for i in range(num_tuples)]

# checks that the vtk cell values are equal to the data / mesh volumes
assert np.allclose(vtk_values, data / mesh.volumes.T.flatten())

mesh.write_data_to_vtk(
filename=filename,
datasets={"not_normalized": data},
volume_normalization=False,
)

reader = vtk.vtkStructuredGridReader()
reader.SetFileName(filename)
reader.ReadAllFieldsOn()
reader.Update()

cell_data = reader.GetOutput().GetCellData()
uniform_array = cell_data.GetArray("not_normalized")
num_tuples = uniform_array.GetNumberOfTuples()
vtk_values = [uniform_array.GetValue(i) for i in range(num_tuples)]

# checks that the vtk cell values are equal to the data
assert np.array_equal(vtk_values, data)