[vtkusers] how to attach multi-attributes to the same dataset?

[April.Q]

I want to build a StructuredGrid with two attribute data (both are scalars)
assign to the point data.
just something like this:

        points = vtk.vtkPoints()
        scalar_1 = vtk.vtkDoubleArray()
        scalar_2= vtk.vtkDoubleArray()
        ... ...
       # set points ,  scalar_1 and  scalar_2
        ind = 0
        for k in range(z):
            for j in range(y):
                for i in range(x):
                    points.SetPoint(ind, datax[k,j,i], datay[k,j,i],
dataz[k,j,i])
                    scalar_1.InsertValue(ind, s1[k,j,i])
                    scalar_2.InsertValue(ind, s2[k,j,i])
                    ind += 1
         ... ...
        sgrid = vtk.vtkStructuredGrid()
        sgrid.SetDimensions(x,y,z)
        sgrid.SetPoints(points)
       # bellow is what i really want to do, they don't work
        sgrid.GetPointData().SetScalars(scalar_1)
        sgrid.GetPointData().GetScalars(scalar_1).SetName("scalar1")
        sgrid.GetPointData().SetScalars(scalar_2)
        sgrid.GetPointData().GetScalars(scalar_2).SetName("scalar2")

and when i use this StructuredGrid (sgrid) i can do something like this:
        scalarOne = sgrid.GetScalar("scalar1")#get the data by it's name
        scalarTwo = sgrid.GetScalar("scalar2")#get the data by it's name

any help?
thx.
 


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