Method InterpolateFunctions

Common/DataModel/vtkPolygon.cxx:482–520

------------------------------------------------------------------------------ Compute interpolation weights using 1/r**2 normalized sum or mean value coordinate.

// Compute interpolation weights using 1/r**2 normalized sum or mean value
// coordinate.
void vtkPolygon::InterpolateFunctions(const double x[3], double* weights)
{
  // Compute interpolation weights using mean value coordinate.
  if (this->UseMVCInterpolation)
  {
    this->InterpolateFunctionsUsingMVC(x, weights);
    return;
  }

  // Compute interpolation weights using 1/r**2 normalized sum.
  int i;
  int numPts = this->Points->GetNumberOfPoints();
  double sum, pt[3];

  for (sum = 0.0, i = 0; i < numPts; i++)
  {
    this->Points->GetPoint(i, pt);
    weights[i] = vtkMath::Distance2BetweenPoints(x, pt);
    if (weights[i] == 0.0) // exact hit
    {
      for (int j = 0; j < numPts; j++)
      {
        weights[j] = 0.0;
      }
      weights[i] = 1.0;
      return;
    }
    else
    {
      weights[i] = 1.0 / weights[i];
      sum += weights[i];
    }
  }

  for (i = 0; i < numPts; i++)
  {
    weights[i] /= sum;
  }
}

//------------------------------------------------------------------------------
// Compute interpolation weights using mean value coordinate.