python - VTK在python中渲染2D网格

Question

所以我尝试使用vtk(在python中)渲染2D网格。我有一个 list 包含所有点的元组以及包含每个单元格的点。只是为了实验，我尝试创建一个多数据对象一个有 4 个元素的正方形并渲染它，但我最终得到了这个:

我希望它显示连接节点的线(如线框)而不是实心正方形..这是生成上图的代码:

def main2():

    #Array of vectors containing the coordinates of each point
    nodes = np.array([[0, 0, 0], [1, 0, 0], [2, 0, 0], [2, 1, 0], [2, 2, 0], 
                      [1, 2, 0], [0, 2, 0], [0, 1, 0], [1, 1, 0]])

    #Array of tuples containing the nodes correspondent of each element
    elements = np.array([(0, 1, 8, 7), (7, 8, 5, 6), (1, 2, 3, 8), (8, 3, 4, 
                        5)])

    #Make the building blocks of polyData attributes
    Mesh = vtk.vtkPolyData()
    Points = vtk.vtkPoints()
    Cells = vtk.vtkCellArray()  

    #Load the point and cell's attributes
    for i in range(len(nodes)):
        Points.InsertPoint(i, nodes[i])

    for i in range(len(elements)):
        Cells.InsertNextCell(mkVtkIdList(elements[i]))

    #Assign pieces to vtkPolyData
    Mesh.SetPoints(Points)
    Mesh.SetPolys(Cells)

    #Mapping the whole thing
    MeshMapper = vtk.vtkPolyDataMapper()
    if vtk.VTK_MAJOR_VERSION <= 5:
        MeshMapper.SetInput(Mesh)
    else:
        MeshMapper.SetInputData(Mesh)

    #Create an actor
    MeshActor = vtk.vtkActor()
    MeshActor.SetMapper(MeshMapper)

    #Rendering Stuff
    camera = vtk.vtkCamera()
    camera.SetPosition(1,1,1)
    camera.SetFocalPoint(0,0,0)

    renderer = vtk.vtkRenderer()
    renWin   = vtk.vtkRenderWindow()
    renWin.AddRenderer(renderer)

    iren = vtk.vtkRenderWindowInteractor()
    iren.SetRenderWindow(renWin)

    renderer.AddActor(MeshActor)
    renderer.SetActiveCamera(camera)
    renderer.ResetCamera()
    renderer.SetBackground(1,1,1)

    renWin.SetSize(300,300)

    #Interact with data
    renWin.Render()
    iren.Start()


main2()

我还想知道是否可以使用网格线作为渲染窗口的背景，而不是黑色，就像这样:

提前致谢!

Answer 1

您可以使用 MeshActor.GetProperty().SetRepresentationToWireframe() ( https://www.vtk.org/doc/nightly/html/classvtkProperty.html#a2a4bdf2f46dc499ead4011024eddde5c ) 将 actor 渲染为线框，或使用 MeshActor.GetProperty().SetEdgeVisibility(True) 将其渲染为实体，并将边缘渲染为线条。

关于渲染窗口背景，我不知道。