Function ApplyMorphingToDataArray

IO/Geometry/vtkGLTFReader.cxx:175–207

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

//------------------------------------------------------------------------------
vtkSmartPointer<vtkDataArray> ApplyMorphingToDataArray(vtkSmartPointer<vtkDataArray> origin,
  const std::vector<float>& weights, const std::vector<vtkSmartPointer<vtkFloatArray>>& targets)
{
  if (origin == nullptr)
  {
    return nullptr;
  }

  vtkSmartPointer<vtkDataArray> result = vtkSmartPointer<vtkDataArray>::Take(origin->NewInstance());
  result->DeepCopy(origin);

  if (targets.empty() || weights.empty() || targets.size() != weights.size())
  {
    return origin;
  }
  std::vector<double> tuple(origin->GetNumberOfComponents(), 0);
  for (int tupleId = 0; tupleId < origin->GetNumberOfTuples(); tupleId++)
  {
    origin->GetTuple(tupleId, tuple.data());
    for (unsigned int targetId = 0; targetId < targets.size(); targetId++)
    {
      for (int component = 0; component < targets[targetId]->GetNumberOfComponents(); component++)
      {
        // Morphing:
        // P the resulting tuple, P0 the primitive's tuple, wi the weights, Ti the targets' tuples:
        // P = P0 + sum(wi * Ti)
        tuple[component] += weights[targetId] * targets[targetId]->GetTuple(tupleId)[component];
      }
    }
    result->SetTuple(tupleId, tuple.data());
  }
  return result;
}

//------------------------------------------------------------------------------
void SetupWeightedTransformFilterForGLTFSkinning(vtkSmartPointer<vtkWeightedTransformFilter> filter,