访问 vtkActor 构造对象并附加新数据

Question

我正在使用 VTK-6.1，我想使用多个 vtkUnstructuredGrid 创建一个 vtkActor。首先，我从网格创建演员...

vtkSmartPointer<vtkActor> create_actor()
{
    vtkSmartPointer<vtkUnstructuredGrid> grid = create_grid_a();
    auto mapper = vtkSmartPointer<vtkDataSetMapper>::New();
    mapper->SetInputData(grid);
    auto actor = vtkSmartPointer<vtkActor>::New();
    actor->SetMapper(mapper);
    actor->GetProperty()->SetColor(0.5, 0.5, 0.5);
    actor->GetProperty()->SetEdgeVisibility(1);

    return actor;
}

然后我（尝试）使用另一个网格更新演员：

void update_actor(<vtkSmartPointer<vtkActor> actor)
{
    // get current grid
    vtkAlgorithm* algorithm = actor->GetMapper()->GetInputAlgorithm();
    actor_grid = dynamic_cast<vtkUnstructuredGrid>(algorithm);

    // create new grid
    vtkSmartPointer<vtkUnstructuredGrid> new_grid = create_grid_b();

    // combine grids
    auto append_filter = vtkSmartPointer<vtkAppendFilter>::New();
    append_filter->AddInputData(actor_grid);
    append_filter->AddInputData(new_grid);
    append_filter->Update();

    // update actor
    auto mapper = vtkSmartPointer<vtkDataSetMapper>::New();
    mapper->SetInputData(append_filter->GetOutput());
    actor->SetMapper(mapper);
}

问题是actor不包含网格的组合

备注：

(create_grid_x() 功能有点太复杂，无法提供，但它们当然可以，因为第一个演员创建正确）

SafeDownCast 如 1 所示也不起作用。

参考文献：

vtkActor reverse access

Appending data

Answer 1

有问题的部分是从 vtkActor 检索 vtkUnstructuredGrid。

// get current grid
vtkDataSet* actor_data = actor->getMapper()->GetInput();

...而不是使用 vtkAlgorithm

访问 vtkActor 构造对象并附加新数据

Access vtkActor construction object and append new data

c++

vtk