Method InternalUpdate

Filters/Hybrid/vtkGridTransform.cxx:1110–1146

------------------------------------------------------------------------------

//------------------------------------------------------------------------------
void vtkGridTransform::InternalUpdate()
{
  vtkImageData* grid = this->GetDisplacementGrid();
  this->GridPointer = nullptr;

  if (grid == nullptr)
  {
    return;
  }

  vtkAlgorithm* inputAlgorithm = this->ConnectionHolder->GetInputAlgorithm(0, 0);
  inputAlgorithm->Update();

  // In case output changed.
  grid = this->GetDisplacementGrid();

  if (grid->GetNumberOfScalarComponents() != 3)
  {
    vtkErrorMacro(<< "TransformPoint: displacement grid must have 3 components");
    return;
  }
  if (grid->GetScalarType() != VTK_CHAR && grid->GetScalarType() != VTK_UNSIGNED_CHAR &&
    grid->GetScalarType() != VTK_SHORT && grid->GetScalarType() != VTK_UNSIGNED_SHORT &&
    grid->GetScalarType() != VTK_FLOAT && grid->GetScalarType() != VTK_DOUBLE)
  {
    vtkErrorMacro(<< "TransformPoint: displacement grid is of unsupported numerical type");
    return;
  }

  this->GridPointer = grid->GetScalarPointer();
  this->GridScalarType = grid->GetScalarType();

  grid->GetSpacing(this->GridSpacing);
  grid->GetOrigin(this->GridOrigin);
  grid->GetExtent(this->GridExtent);
  grid->GetIncrements(this->GridIncrements);
}

//------------------------------------------------------------------------------
vtkAbstractTransform* vtkGridTransform::MakeTransform()