前言:
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++构建的,包含有大约250,000行代码,2000多个类,还包含有几个转换界面,因此也可以自由的通过Java,Tcl/Tk和Python各种语言使用vtk。
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10个球体。
vtk.vtkMinimalStandardRandomSequence(): VTK的随机数生成器,用于代码中的十个球体,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。
主要代码如下:
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#!/usr/bin/env python # noinspection PyUnresolvedReferences import vtk colors = vtk.vtkNamedColors() NUMBER_OF_SPHERES = 10 class MouseInteractorHighLightActor(vtk.vtkInteractorStyleTrackballCamera): def __init__( self , parent = None ): self .AddObserver( "LeftButtonPressEvent" , self .leftButtonPressEvent) self .LastPickedActor = None self .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actor self .NewPickedActor = picker.GetActor() # If something was selected if self .NewPickedActor: # If we picked something before, reset its property if self .LastPickedActor: self .LastPickedActor.GetProperty().DeepCopy( self .LastPickedProperty) # Save the property of the picked actor so that we can # restore it next time self .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actor self .LastPickedActor = self .NewPickedActor self .OnLeftButtonDown() return def main(): # 创建render和window renderer = vtk.vtkRenderer() renderer.SetBackground(colors.GetColor3d( 'SteelBlue' )) renwin = vtk.vtkRenderWindow() renwin.AddRenderer(renderer) renwin.SetSize( 640 , 480 ) 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(1043618065) # randomSequence.SetSeed(5170) randomSequence.SetSeed( 8775070 ) # 添加球体 for i in range (NUMBER_OF_SPHERES): source = vtk.vtkSphereSource() # random position and radius x = 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( 0.4 , 1.0 ) randomSequence. Next () b = randomSequence.GetRangeValue( 0.4 , 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( 30.0 ) renderer.AddActor(actor) # 运行 interactor.Initialize() renwin.Render() interactor.Start() if __name__ = = '__main__' : main() |
显示结果如下: 未选择球体:
已选取球体后:
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原文链接:https://juejin.cn/post/7031521722301939719