Hi,
The calculator gives incorrect results for multiblock unless the
variables have the same index internally. This can be reproduced with
the steps below:
1. Create a python source that outputs vtkUnstructuredGrid with
the following script:
def add_scalar(ds, val):
arr = vtk.vtkDoubleArray()
arr.SetName("Scalar"+str(val))
arr.SetNumberOfComponents(1)
arr.SetNumberOfTuples(8)
for i in range(8):
arr.SetTuple1(i, float(val))
output.GetPointData().AddArray(arr)
output = self.GetOutput()
npts = 8
pts = vtk.vtkPoints()
pts.InsertNextPoint(-3.0, -1.0, -1.0)
pts.InsertNextPoint(-1.0, -1.0, -1.0)
pts.InsertNextPoint(-1.0, 1.0, -1.0)
pts.InsertNextPoint(-3.0, 1.0, -1.0)
pts.InsertNextPoint(-3.0, -1.0, 1.0)
pts.InsertNextPoint(-1.0, -1.0, 1.0)
pts.InsertNextPoint(-1.0, 1.0, 1.0)
pts.InsertNextPoint(-3.0, 1.0, 1.0)
output.SetPoints(pts)
output.Allocate(1,1)
ids = vtk.vtkIdList()
for i in range(npts):
ids.InsertId(i,i)
add_scalar(output, 1)
add_scalar(output, 2)
output.InsertNextCell(vtk.VTK_HEXAHEDRON, ids)
2. Create a second python source that outputs vtkUnstructuredGrid
with the following script (notice the change in order when adding the
scalars):
def add_scalar(ds, val):
arr = vtk.vtkDoubleArray()
arr.SetName("Scalar"+str(val))
arr.SetNumberOfComponents(1)
arr.SetNumberOfTuples(8)
for i in range(8):
arr.SetTuple1(i, float(val))
output.GetPointData().AddArray(arr)
output = self.GetOutput()
npts = 8
pts = vtk.vtkPoints()
pts.InsertNextPoint(-3.0, -1.0, -1.0)
pts.InsertNextPoint(-1.0, -1.0, -1.0)
pts.InsertNextPoint(-1.0, 1.0, -1.0)
pts.InsertNextPoint(-3.0, 1.0, -1.0)
pts.InsertNextPoint(-3.0, -1.0, 1.0)
pts.InsertNextPoint(-1.0, -1.0, 1.0)
pts.InsertNextPoint(-1.0, 1.0, 1.0)
pts.InsertNextPoint(-3.0, 1.0, 1.0)
output.SetPoints(pts)
output.Allocate(1,1)
ids = vtk.vtkIdList()
for i in range(npts):
ids.InsertId(i,i)
add_scalar(output, 2)
add_scalar(output, 1)
output.InsertNextCell(vtk.VTK_HEXAHEDRON, ids)
3. Group the two python sources together
4. Use the Calculator filter to pass through Scalar1
See output below:
Regards,
Paul
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