VTK 在 python 中渲染 2D 网格

Question

所以我正在尝试使用 vtk 渲染 2D 网格（在 python 中）。我有一个清单包含所有点的元组以及包含点的元组列表每个单元格的点。只是为了实验，我尝试创建一个 polydata 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()

我也想知道是否可以用网格线作为渲染的背景 window，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，边缘呈现为线条。

关于渲染 window 背景，我不知道。

Answer 2

感谢@MafiaSkafia，我创建了我一直在寻找的东西，用于 3D 目的的 2D 网格，也许有人也会寻找这样的东西。

# plane
planeSource = vtk.vtkPlaneSource()
planeSource.SetOrigin(-100.0, -100.0, 0.0)
# planeSource.SetNormal(0.0, 0.0, 1.0)
planeSource.SetResolution(100,100)
planeSource.SetPoint1(100.0,-100.0,0.0)
planeSource.SetPoint2(-100.0,100.0,0.0)
planeSource.Update()

plane = planeSource.GetOutput()

# Create a mapper and actor
mapperP = vtk.vtkPolyDataMapper()
mapperP.SetInputData(plane)

actorP = vtk.vtkActor()
actorP.SetMapper(mapperP)
actorP.GetProperty().SetColor(0,0,0)
actorP.GetProperty().EdgeVisibilityOn() # showing mesh
actorP.GetProperty().SetEdgeColor(1,1,1)
actorP.GetProperty().SetOpacity(0.2) # transparency
...
renderer.AddActor(actorP)

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