Method ExecuteDataWithInformation

Imaging/Hybrid/vtkSampleFunction.cxx:395–447

------------------------------------------------------------------------------ Produce the data.

//------------------------------------------------------------------------------
// Produce the data.
void vtkSampleFunction::ExecuteDataWithInformation(vtkDataObject* outp, vtkInformation* outInfo)
{
  vtkFloatArray* newNormals = nullptr;
  float* normals = nullptr;

  vtkImageData* output = this->GetOutput();
  int* extent = this->GetExecutive()->GetOutputInformation(0)->Get(
    vtkStreamingDemandDrivenPipeline::UPDATE_EXTENT());

  output->SetExtent(extent);
  output = this->AllocateOutputData(outp, outInfo);
  vtkDataArray* newScalars = output->GetPointData()->GetScalars();
  vtkIdType numPts = newScalars->GetNumberOfTuples();

  vtkDebugMacro(<< "Sampling implicit function");

  // Initialize self; create output objects
  //
  if (!this->ImplicitFunction)
  {
    vtkErrorMacro(<< "No implicit function specified");
    return;
  }

  if (this->ComputeNormals)
  {
    newNormals = vtkFloatArray::New();
    newNormals->SetNumberOfComponents(3);
    newNormals->SetNumberOfTuples(numPts);
    normals = newNormals->WritePointer(0, numPts);
  }

  void* ptr = output->GetArrayPointerForExtent(newScalars, extent);
  switch (newScalars->GetDataType())
  {
    vtkTemplateMacro(vtkSampleFunctionAlgorithm<VTK_TT>::SampleAcrossImage(
      this, output, extent, (VTK_TT*)ptr, normals));
  }

  newScalars->SetName(this->ScalarArrayName);

  // Update self
  //
  if (newNormals)
  {
    // For an unknown reason yet, if the following line is not commented out,
    // it will make ImplicitSum, TestBoxFunction and TestDiscreteMarchingCubes
    // to fail.
    newNormals->SetName(this->NormalArrayName);
    output->GetPointData()->SetNormals(newNormals);
    newNormals->Delete();
  }
}

//------------------------------------------------------------------------------
vtkMTimeType vtkSampleFunction::GetMTime()