Method SetTensor

Interaction/Widgets/vtkTensorRepresentation.cxx:303–329

------------------------------------------------------------------------------ Given a 3x3 symmetric tensor, update the widget accordingly.

//------------------------------------------------------------------------------
// Given a 3x3 symmetric tensor, update the widget accordingly.
void vtkTensorRepresentation::SetTensor(double tensor[9])
{
  std::copy(tensor, tensor + 9, this->Tensor);

  // Evaluate eigenfunctions: set up working matrices
  double *m[3], *v[3];
  double m0[3], m1[3], m2[3];
  m[0] = m0;
  m[1] = m1;
  m[2] = m2;
  v[0] = this->Eigenvectors[0];
  v[1] = this->Eigenvectors[1];
  v[2] = this->Eigenvectors[2];

  for (auto j = 0; j < 3; j++)
  {
    for (auto i = 0; i < 3; i++)
    {
      m[i][j] = 0.5 * (tensor[i + 3 * j] + tensor[j + 3 * i]);
    }
  }
  vtkMath::Jacobi(m, this->Eigenvalues, v);

  // Now update the widget/representation from the tensor
  this->PositionHandles();
  this->UpdateWidgetFromTensor();
}

//------------------------------------------------------------------------------
// Set the position of the tensor. This means translating the representation.