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POc++ vtk xml writer (vtkImageData) - multiple variables in the same vti file
 

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    <p>I am trying to write data from a uniform grid to a vtk XML file, so that I can render it using Paraview. I would like my output file to contain two variables: one 3-component vector and one scalar value at every point. I have managed to write a .vti file, containing the vectors only, like so:</p> <pre><code>#include &lt;vtkVersion.h&gt; #include &lt;vtkSmartPointer.h&gt; #include &lt;vtkXMLImageDataWriter.h&gt; #include &lt;vtkImageData.h&gt; int main() { int nx = 10, ny = 10, nz = 10; vtkSmartPointer&lt;vtkImageData&gt; imageData = vtkSmartPointer&lt;vtkImageData&gt;::New(); imageData-&gt;SetDimensions(nx, ny, nz); #if VTK_MAJOR_VERSION &lt;= 5 imageData-&gt;SetNumberOfScalarComponents(3); imageData-&gt;SetScalarTypeToDouble(); #else imageData-&gt;AllocateScalars(VTK_DOUBLE, 3); #endif for (int k = 0; k &lt; nz; ++k) { for (int j = 0; j &lt; ny; ++j) { for (int i = 0; i &lt; nx; ++i) { double * voxel = static_cast&lt;double*&gt;(imageData-&gt;GetScalarPointer(i,j,k)); int coord = i + j * nx + k * nx * ny; double t = 0.0; double p = 1.0; voxel[0] = sin(t) * cos(p); voxel[1] = sin(t) * sin(p); voxel[2] = cos(t); } } } vtkSmartPointer&lt;vtkXMLImageDataWriter&gt; writer = vtkSmartPointer&lt;vtkXMLImageDataWriter&gt;::New(); writer-&gt;SetFileName("test.vti"); #if VTK_MAJOR_VERSION &lt;= 5 writer-&gt;SetInputConnection(imageData-&gt;GetProducerPort()); #else writer-&gt;SetInputData(imageData); #endif writer-&gt;Write(); return EXIT_SUCCESS; } </code></pre> <p>How can I add an additional scalar value to every point on the grid?</p>
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