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<p class=MsoNormal><span lang=EN-US style='color:#595959'>Hi,<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='color:#595959'><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='color:#595959'>I am attempting to
create a data source based on a </span><span style='font-size:10.0pt;
font-family:"Courier New"'>vtkStructuredGridAlgorithm</span><span lang=EN-US
style='color:#595959'>. Eventually I would like to represent the grid in
a hexahedron format <a
href="http://vtk.1045678.n5.nabble.com/Creating-a-structured-grid-of-250x250-cells-is-causing-MS-runtime-to-throw-an-exception-td1250336.html">http://vtk.1045678.n5.nabble.com/Creating-a-structured-grid-of-250x250-cells-is-causing-MS-runtime-to-throw-an-exception-td1250336.html</a>.
While I have been able to get this example running in vtk using the python API,
my Paraview plugin source does not work. <o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='color:#595959'><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='color:#595959'>I have the same
problem attempting to write a plugin source using a simpler example from the
vtk guide: <a
href="http://public.kitware.com/cgi-bin/viewcvs.cgi/*checkout*/Examples/DataManipulation/Cxx/SGrid.cxx?root=VTK&content-type=text/plain">http://public.kitware.com/cgi-bin/viewcvs.cgi/*checkout*/Examples/DataManipulation/Cxx/SGrid.cxx?root=VTK&content-type=text/plain</a>.
According to the information tab in Paraview, I have zero points and zero
cells, although debugging the datasource shows that for my vtkStructuredGrid
output, the points and cells have been created.<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='color:#595959'><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='color:#595959'>Can anyone spot what
I might be doing, and suggest how I might fix the problem (see below).<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='color:#595959'><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='color:#595959'>Thanks in advance,<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='color:#595959'><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='color:#595959'>Owen<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='color:#595959'><o:p> </o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New";color:blue'>int</span><span style='font-size:10.0pt;
font-family:"Courier New"'>
vtkStructuredHexahedronSource::RequestData(vtkInformation *request,
vtkInformationVector **inputVector, vtkInformationVector *outputVector)<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'>{<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'> vtkInformation
*outInfo = outputVector->GetInformationObject(0);<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'> vtkStructuredGrid
*output =
vtkStructuredGrid::SafeDownCast(outInfo->Get(vtkDataObject::DATA_OBJECT()));<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'><o:p> </o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'> <span
style='color:blue'>int</span> i, j, k, kOffset, jOffset, offset;<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'> <span
style='color:blue'>float</span> x[3], v[3], rMin=0.5, rMax=1.0, deltaRad,
deltaZ;<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'> <span
style='color:blue'>float</span> radius, theta;<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'> <span
style='color:blue'>static</span> <span style='color:blue'>int</span>
dims[3]={13,11,11};<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'><o:p> </o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'> <span
style='color:green'>// Create the structured grid.<o:p></o:p></span></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New";color:green'><o:p> </o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'> output->SetDimensions(dims);<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'><o:p> </o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'> <span
style='color:green'>// We also create the points and vectors. The points<o:p></o:p></span></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'> <span
style='color:green'>// form a hemi-cylinder of data.<o:p></o:p></span></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'> vtkFloatArray
*vectors = vtkFloatArray::New();<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'> vectors->SetNumberOfComponents(3);<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'> vectors->SetNumberOfTuples(dims[0]*dims[1]*dims[2]);<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'> vtkPoints *points =
vtkPoints::New();<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'> points->Allocate(dims[0]*dims[1]*dims[2]);<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'><o:p> </o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'> deltaZ = 2.0 /
(dims[2]-1);<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'> deltaRad =
(rMax-rMin) / (dims[1]-1);<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'> v[2]=0.0;<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'> <span
style='color:blue'>for</span> ( k=0; k<dims[2]; k++)<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'> {<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'> x[2]
= -1.0 + k*deltaZ;<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'> kOffset
= k * dims[0] * dims[1];<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'> <span
style='color:blue'>for</span> (j=0; j<dims[1]; j++) <o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'> {<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'> radius
= rMin + j*deltaRad;<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'> jOffset
= j * dims[0];<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'> <span
style='color:blue'>for</span> (i=0; i<dims[0]; i++) <o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'> {<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'> theta
= i * vtkMath::RadiansFromDegrees(15.0);<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'> x[0]
= radius * cos(theta);<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'> x[1]
= radius * sin(theta);<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'> v[0]
= -x[1];<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'> v[1]
= x[0];<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'> offset
= i + jOffset + kOffset;<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'> points->InsertPoint(offset,x);<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'> vectors->InsertTuple(offset,v);<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'> }<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'> }<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'> }<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'> output->SetPoints(points);<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'> points->Delete();<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'> output->GetPointData()->SetVectors(vectors);<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Courier New"'> vectors->Delete();<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'> <span
style='color:blue'>return</span> 1;<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Courier New"'>}<o:p></o:p></span></p>
</div>
<br><p>--
<BR>Scanned by iCritical.
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