[vtkusers] Legacy VTK Python reader: multiple SCALARS fields

[Nico Schlömer]

Hi,

I'm trying to read a regular legacy VTK file with the structure

============================================ *snip*
============================================
# vtk DataFile Version 2.0
foobaar
ASCII
DATASET STRUCTURED_POINTS
DIMENSIONS 65 65 1
ORIGIN 0 0 0
SPACING 7.812576686292641e-02 7.812576686292641e-02 0.000000000000000e+00
POINT_DATA 4225
SCALARS x0 float
LOOKUP_TABLE default
4.706019103136933e-01
4.698415308734816e-01
[...]
SCALARS x1 float
LOOKUP_TABLE default
-1.978262906781735e+00
-1.901501675888420e+00
[...]
============================================ *snap*
============================================

-- that is, *two* SCALARS lists x0 and x1. I'm using the VTK Python
interface, more precisely

============================================ *snip*
============================================
import vtk
from vtk import *
reader = vtkDataSetReader()
reader.SetFileName( filepath )
reader.Update()
x1Array = reader.GetOutput()
============================================ *snap*
============================================

The output of this is *almost* okay, namely

============================================ *snip*
============================================
vtkStructuredPoints (0x3588660)
  Debug: Off
  Modified Time: 36397
  Reference Count: 2
  Registered Events: (none)
  Source: (none)
  Information: 0x35c3190
  Data Released: False
  Global Release Data: Off
  UpdateTime: 36419
  Release Data: Off
  UpdateExtent: Not Initialized
  UpdateExtent: 0, 64, 0, 64, 0, 0
  WholeExtent: 0, 64, 0, 64, 0, 0
  ExtentTranslator: (0x35d2c20)
  RequestExactExtent: Off
   Field Data:
    Debug: Off
    Modified Time: 36148
    Reference Count: 1
    Registered Events: (none)
    Number Of Arrays: 0
    Number Of Components: 0
    Number Of Tuples: 0
  Number Of Points: 4225
  Number Of Cells: 4096
  Cell Data:
    Debug: Off
    Modified Time: 36393
    Reference Count: 1
    Registered Events: (none)
    Number Of Arrays: 0
    Number Of Components: 0
    Number Of Tuples: 0
    Copy Tuple Flags: ( 1 1 1 1 1 0 1 )
    Interpolate Flags: ( 1 1 1 1 1 0 0 )
    Pass Through Flags: ( 1 1 1 1 1 1 1 )
    Scalars: (none)
    Vectors: (none)
    Normals: (none)
    TCoords: (none)
    Tensors: (none)
    GlobalIds: (none)
    PedigreeIds: (none)
  Point Data:
    Debug: Off
    Modified Time: 36397
    Reference Count: 1
    Registered Events: (none)
    Number Of Arrays: 1
    Array 0 name = x0
    Number Of Components: 1
    Number Of Tuples: 4225
    Copy Tuple Flags: ( 1 1 1 1 1 0 1 )
    Interpolate Flags: ( 1 1 1 1 1 0 0 )
    Pass Through Flags: ( 1 1 1 1 1 1 1 )
    Scalars:
      Debug: Off
      Modified Time: 36371
      Reference Count: 2
      Registered Events: (none)
      Name: x0
      Data type: float
      Size: 4225
      MaxId: 4224
      NumberOfComponents: 1
      Information: 0
      Name: x0
      Number Of Components: 1
      Number Of Tuples: 4225
      Size: 4225
      MaxId: 4224
      LookupTable: (none)
      Array: 0x356a860
    Vectors: (none)
    Normals: (none)
    TCoords: (none)
    Tensors: (none)
    GlobalIds: (none)
    PedigreeIds: (none)
  Bounds:
    Xmin,Xmax: (0, 5.00005)
    Ymin,Ymax: (0, 5.00005)
    Zmin,Zmax: (0, 0)
  Compute Time: 0
  ScalarType: 10
  NumberOfScalarComponents: 1
  Spacing: (0.0781258, 0.0781258, 0)
  Origin: (0, 0, 0)
  Dimensions: (65, 65, 1)
  Increments: (0, 0, 0)
  Extent: (0, 64, 0, 64, 0, 0)
============================================ *snap*
============================================

The issue is that I only seem to have access to *one* of the two
SCALARS lists, and cannot get x1.

Am I possibly calling the wrong reader methods? Any hints?

Cheers,
Nico