Method UpdatePaths

Rendering/Core/vtkAssembly.cxx:276–312

Build the assembly paths if necessary. UpdatePaths() is only called when the assembly is at the root of the hierarchy; otherwise UpdatePaths() is called.

// is only called when the assembly is at the root
// of the hierarchy; otherwise UpdatePaths() is called.
void vtkAssembly::UpdatePaths()
{
  if (this->GetMTime() > this->PathTime ||
    (this->Paths != nullptr && this->Paths->GetMTime() > this->PathTime))
  {
    if (this->Paths)
    {
      this->Paths->Delete();
      this->Paths = nullptr;
    }

    // Create the list to hold all the paths
    this->Paths = vtkAssemblyPaths::New();
    vtkAssemblyPath* path = vtkAssemblyPath::New();

    // add ourselves to the path to start things off
    path->AddNode(this, this->GetMatrix());

    // Add nodes as we proceed down the hierarchy
    vtkProp3D* prop3D;
    vtkCollectionSimpleIterator pit;
    for (this->Parts->InitTraversal(pit); (prop3D = this->Parts->GetNextProp3D(pit));)
    {
      path->AddNode(prop3D, prop3D->GetMatrix());

      // dive into the hierarchy
      prop3D->BuildPaths(this->Paths, path);

      // when returned, pop the last node off of the
      // current path
      path->DeleteLastNode();
    }

    path->Delete();
    this->PathTime.Modified();
  }
}

// Build assembly paths from this current assembly. A path consists of
// an ordered sequence of props, with transformations properly concatenated.