vtk采用vtkanimationscene创建三角形不同时刻温度动画的python示例

以下是使用vtkanimationscene创建三角形不同时刻温度动画的Python示例代码：

import vtk

# Create a vtkRenderWindow and a vtkRenderer
ren = vtk.vtkRenderer()
renWin = vtk.vtkRenderWindow()
renWin.AddRenderer(ren)

# Create a vtkRenderWindowInteractor
iren = vtk.vtkRenderWindowInteractor()
iren.SetRenderWindow(renWin)

# Create a vtkTriangle source
triangle = vtk.vtkTriangle()
triangle.GetPointIds().SetId(0, 0)
triangle.GetPointIds().SetId(1, 1)
triangle.GetPointIds().SetId(2, 2)

# Create a vtkPolyData containing the triangle
points = vtk.vtkPoints()
points.InsertNextPoint(0, 0, 0)
points.InsertNextPoint(1, 0, 0)
points.InsertNextPoint(0.5, 1, 0)
trianglePolyData = vtk.vtkPolyData()
trianglePolyData.SetPoints(points)
trianglePolyData.Allocate(1, 1)
trianglePolyData.InsertNextCell(triangle.GetCellType(), triangle.GetPointIds())

# Create a vtkPolyDataMapper and set the input to the vtkPolyData containing the triangle
mapper = vtk.vtkPolyDataMapper()
mapper.SetInputData(trianglePolyData)

# Create a vtkActor and set the mapper to the vtkPolyDataMapper
actor = vtk.vtkActor()
actor.SetMapper(mapper)

# Add the actor to the renderer
ren.AddActor(actor)

# Create a vtkAnimationScene
scene = vtk.vtkAnimationScene()
scene.SetModeToRealTime()
scene.SetLoop(True)

# Define the temperature values at different times
times = [0, 1, 2, 3, 4]
temperatures = [0, 1, 0.5, 0, 0.5]

# Define a function to update the actor's color based on the temperature at the current time
def updateColor(time, actor):
    temperature = temperatures[int(time)]
    actor.GetProperty().SetColor(1-temperature, 0, temperature)

# Add the function to the animation scene
scene.AddObserver(vtk.vtkCommand.AnimationCueTickEvent, updateColor)

# Add the animation scene to the renderer
ren.SetScene(scene)

# Start the animation
iren.Initialize()
iren.Start()

在这个示例中，我们首先创建了一个包含一个三角形的vtkPolyData，并将其添加到一个vtkActor中。然后，我们创建了一个vtkAnimationScene，并定义了不同时间的温度值。我们还定义了一个函数，该函数根据当前时间的温度值更新演员的颜色。最后，我们将该函数添加到动画场景中，并启动动画。在动画中，三角形的颜色将根据时间变化而变化