VTK：使用 vtkDelaunay2D 创建多边形和孔不起作用

Question

我想在 VTK 中渲染一个有洞的多边形。我发现 vtkDelaunay2D class 应该可以解决问题。我按照这里的教程 vtkDelaunay2D Example 进行了操作，效果非常好。

之后我尝试用不同的孔创建不同的多边形。我不明白为什么它不起作用，想知道我必须改变什么。

它应该是这样的。现实中是这样的。

这是我使用的代码：

import vtk
import random

points = vtk.vtkPoints()

ls = [
    [2, 2], [-2, 2], [-2, -2], [2, -2], 
    [5, 5], [-5, 5], [-8, 0], [-5, -5], [5, -5], [8, 0],
    [10, 10], [-10, 10], [-10, -10], [10, -10]
]
for x, y in ls:
    points.InsertNextPoint(x, y, 0)

aPolyData = vtk.vtkPolyData()
aPolyData.SetPoints(points)


aCellArray = vtk.vtkCellArray()

cPolygon = vtk.vtkPolygon()
start = 0
for idd in range(start, start + 4):
    cPolygon.GetPointIds().InsertNextId(idd)
aCellArray.InsertNextCell(cPolygon)

boundary = vtk.vtkPolyData()
boundary.SetPoints(aPolyData.GetPoints())
boundary.SetPolys(aCellArray)

delaunay = vtk.vtkDelaunay2D()
delaunay.SetInputData(aPolyData)
delaunay.SetSourceData(boundary)

################################## Actors etc:
meshMapper = vtk.vtkPolyDataMapper()
meshMapper.SetInputConnection(delaunay.GetOutputPort())

colors = vtk.vtkNamedColors()

meshActor = vtk.vtkActor()
meshActor.SetMapper(meshMapper)
meshActor.GetProperty().EdgeVisibilityOn()
meshActor.GetProperty().SetEdgeColor(colors.GetColor3d("Peacock"))
meshActor.GetProperty().SetInterpolationToFlat()


boundaryMapper = vtk.vtkPolyDataMapper()
boundaryMapper.SetInputData(boundary)

boundaryActor = vtk.vtkActor()
boundaryActor.SetMapper(boundaryMapper)
boundaryActor.GetProperty().SetColor(colors.GetColor3d("Raspberry"))
boundaryActor.GetProperty().SetLineWidth(3)
boundaryActor.GetProperty().EdgeVisibilityOn()
boundaryActor.GetProperty().SetEdgeColor(1, 1, 0)
boundaryActor.GetProperty().SetRepresentationToWireframe()

renderer = vtk.vtkRenderer()
renderWindow = vtk.vtkRenderWindow()
renderWindow.AddRenderer(renderer)
renderWindowInteractor = vtk.vtkRenderWindowInteractor()
renderWindowInteractor.SetRenderWindow(renderWindow)

renderer.AddActor(meshActor)
renderer.AddActor(boundaryActor)
renderer.SetBackground(colors.GetColor3d("Mint"))

renderWindow.SetSize(640, 480)
renderWindow.Render()
renderWindowInteractor.Start()

据我所知应该可以。就像在示例中一样，我创建了一组点，在前 4 个点（应该是洞）周围定义了一个边界，然后渲染它。

Answer 1

改变

for idd in range(start, start + 4):

进入

for idd in reversed(range(start, start + 4)):

VTK：使用 vtkDelaunay2D 创建多边形和孔不起作用

VTK: creating polygon and a hole with vtkDelaunay2D not working

python

vtk