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前言：

    本文主要介绍了如何使用Python VTK高亮显示actor，使用Python语言，高亮显示选中的actor。当窗口中的圆球actor被选中时，会变成红色，并且会显示actor三遍面片边缘信息。

效果：

 VTK

      VTK，（visualizationtoolkit）是一个开放资源的免费软件系统，主要用于三维计算机图形学、图像处理和可视化。Vtk是在面向对象原理的基础上设计和实现的，它的内核是用C++构建。

主要函数介绍：

NewPickedActor.GetProperty()： 

通过该函数，可以设置actor的性质，如颜色、表面样式等。

vtk.vtkSphereSource()： 

创建球体的函数，文中通过一个for循环创建了6个球体。

vtk.vtkMinimalStandardRandomSequence()：

 VTK的随机数生成器，用于代码中的球体，随机生成球体的大小和位置。

MouseInteractorHighLightActor： 

定义actor操作方法，这个是一个鼠标操作控件的控制方法。

leftButtonPressEvent(self, obj, event)： 

这是一个事件触发函数，当鼠标左键点击对应的actor时，会触发函数，对点的actor高亮显示。

Code:

#!/usr/bin/env python# noinspection PyUnresolvedReferences
import vtkcolors = vtk.vtkNamedColors()
NUMBER_OF_SPHERES = 6class MouseInteractorHighLightActor(vtk.vtkInteractorStyleTrackballCamera):def __init__(self, parent=None):self.AddObserver("LeftButtonPressEvent", self.leftButtonPressEvent)self.LastPickedActor = Noneself.LastPickedProperty = vtk.vtkProperty()def leftButtonPressEvent(self, obj, event):clickPos = self.GetInteractor().GetEventPosition()picker = vtk.vtkPropPicker()picker.Pick(clickPos[0], clickPos[1], 0, self.GetDefaultRenderer())# 创建一个新的actorself.NewPickedActor = picker.GetActor()# If something was selectedif self.NewPickedActor:# If we picked something before, reset its propertyif self.LastPickedActor:self.LastPickedActor.GetProperty().DeepCopy(self.LastPickedProperty)if self.LastPickedActor == self.NewPickedActor:self.NewPickedActor.GetProperty().DeepCopy(self.LastPickedProperty)self.LastPickedActor=Noneelse:# Save the property of the picked actor so that we can# restore it next timeself.LastPickedProperty.DeepCopy(self.NewPickedActor.GetProperty())# 高亮选中球体，并显示边缘self.NewPickedActor.GetProperty().SetColor(colors.GetColor3d('Red'))self.NewPickedActor.GetProperty().SetDiffuse(1.0)self.NewPickedActor.GetProperty().SetSpecular(0.0)self.NewPickedActor.GetProperty().EdgeVisibilityOn()# 保存最后一个选中的actorself.LastPickedActor = self.NewPickedActorself.OnLeftButtonDown()returndef main():# 创建render和windowrenderer = vtk.vtkRenderer()renderer.SetBackground(colors.GetColor3d('SteelBlue'))renwin = vtk.vtkRenderWindow()renwin.AddRenderer(renderer)renwin.SetSize(640, 600)renwin.SetWindowName('HighlightPickedActor')# 建立interactor(交互操作)interactor = vtk.vtkRenderWindowInteractor()interactor.SetRenderWindow(renwin)# 交互操作方法style = MouseInteractorHighLightActor()style.SetDefaultRenderer(renderer)interactor.SetInteractorStyle(style)randomSequence = vtk.vtkMinimalStandardRandomSequence()randomSequence.SetSeed(8775070)# 添加球体for i in range(NUMBER_OF_SPHERES):source = vtk.vtkSphereSource()# random position and radiusx = randomSequence.GetRangeValue(-5.0, 5.0)randomSequence.Next()y = randomSequence.GetRangeValue(-5.0, 5.0)randomSequence.Next()z = randomSequence.GetRangeValue(-5.0, 5.0)randomSequence.Next()radius = randomSequence.GetRangeValue(0.5, 1.0)randomSequence.Next()source.SetRadius(radius)source.SetCenter(x, y, z)source.SetPhiResolution(11)source.SetThetaResolution(21)mapper = vtk.vtkPolyDataMapper()mapper.SetInputConnection(source.GetOutputPort())actor = vtk.vtkActor()actor.SetMapper(mapper)r = randomSequence.GetRangeValue(0.4, 1.0)randomSequence.Next()g = randomSequence.GetRangeValue(0.1, 1.0)randomSequence.Next()b = randomSequence.GetRangeValue(0.6, 1.0)randomSequence.Next()actor.GetProperty().SetDiffuseColor(r, g, b)actor.GetProperty().SetDiffuse(.8)actor.GetProperty().SetSpecular(.5)actor.GetProperty().SetSpecularColor(colors.GetColor3d('White'))actor.GetProperty().SetSpecularPower(10.0)renderer.AddActor(actor)# 运行interactor.Initialize()renwin.Render()interactor.Start()if __name__ == '__main__':main()