一：主要的知识点
1、说明
本文只是教程内容的一小段，因博客字数限制，故进行拆分。主教程链接：vtk教程——逐行解析官网所有Python示例-CSDN博客
2、知识点纪要
本段代码主要涉及的有①物体如何绕轴旋转，②渲染的擦除功能EraseOff
二：代码及注释
import time import vtkmodules.vtkInteractionStyle import vtkmodules.vtkRenderingOpenGL2 from vtkmodules.vtkCommonColor import vtkNamedColors from vtkmodules.vtkRenderingCore import vtkRenderer, vtkRenderWindow, vtkRenderWindowInteractor, vtkPolyDataMapper, vtkActor from vtkmodules.vtkIOPLY import vtkPLYReader from vtkmodules.vtkIOXML import vtkXMLPolyDataReader from vtkmodules.vtkIOGeometry import vtkOBJReader, vtkSTLReader, vtkBYUReader from vtkmodules.vtkFiltersGeneral import vtkAxes from vtkmodules.vtkFiltersSources import vtkSphereSource def ReadPolyData(file_name): import os path, extension = os.path.splitext(file_name) extension = extension.lower() if extension == '.ply': reader = vtkPLYReader() reader.SetFileName(file_name) reader.Update() poly_data = reader.GetOutput() elif extension == '.vtp': reader = vtkXMLPolyDataReader() reader.SetFileName(file_name) reader.Update() poly_data = reader.GetOutput() elif extension == '.obj': reader = vtkOBJReader() reader.SetFileName(file_name) reader.Update() poly_data = reader.GetOutput() elif extension == '.stl': reader = vtkSTLReader() reader.SetFileName(file_name) reader.Update() poly_data = reader.GetOutput() elif extension == '.vtk': reader = vtkXMLPolyDataReader() reader.SetFileName(file_name) reader.Update() poly_data = reader.GetOutput() elif extension == '.g': reader = vtkBYUReader() reader.SetGeometryFileName(file_name) reader.Update() poly_data = reader.GetOutput() else: # Return a sphere if the extension is unknown. source = vtkSphereSource() source.Update() poly_data = source.GetOutput() return poly_data def RotateX(renWin, actor): actor.SetOrientation(0, 0, 0) for i in range(0, 6): time.sleep(1) actor.RotateX(60) renWin.Render() renWin.EraseOn() def RotateY(renWin, actor): actor.SetOrientation(0, 0, 0) for i in range(0, 6): time.sleep(1) actor.RotateY(60) renWin.Render() renWin.EraseOn() def RotateZ(renWin, actor): actor.SetOrientation(0, 0, 0) for i in range(0, 6): time.sleep(1) actor.RotateZ(60) renWin.Render() renWin.EraseOn() def main(): file_name = "Data/cow.obj" figure = 10 actor_color = "Wheat" colors = vtkNamedColors() colors.SetColor("BkgColor", (26, 51, 102, 255)) ren1 = vtkRenderer() renWin = vtkRenderWindow() renWin.AddRenderer(ren1) iren = vtkRenderWindowInteractor() iren.SetRenderWindow(renWin) polyData = ReadPolyData(file_name) modelMapper = vtkPolyDataMapper() modelMapper.SetInputData(polyData) modelActor = vtkActor() modelActor.SetMapper(modelMapper) modelActor.GetProperty().SetDiffuseColor(colors.GetColor3d(actor_color)) if actor_color != 'Wheat': modelActor.GetProperty().SetSpecular(0.6) modelActor.GetProperty().SetSpecularPower(30) modelAxesSource = vtkAxes() modelAxesSource.SetScaleFactor(10) modelAxesSource.SetOrigin(0, 0, 0) modelAxesMapper = vtkPolyDataMapper() modelAxesMapper.SetInputConnection(modelAxesSource.GetOutputPort()) modelAxes = vtkActor() modelAxes.SetMapper(modelAxesMapper) ren1.AddActor(modelAxes) ren1.AddActor(modelActor) if actor_color == 'Wheat': ren1.SetBackground(colors.GetColor3d('BkgColor')) else: ren1.SetBackground(colors.GetColor3d('Silver')) renWin.SetSize(640, 480) renWin.SetWindowName('Rotations') ren1.ResetCamera() ren1.GetActiveCamera().Azimuth(0) ren1.GetActiveCamera().SetClippingRange(0.1, 1000.0) renWin.Render() if figure == 1: RotateX(renWin, modelActor) elif figure == 2: RotateY(renWin, modelActor) else: RotateZ(renWin, modelActor) """ EraseOff 关闭擦除功能 在3D渲染和动画中，一个基本的步骤是：在渲染新的一帧之前，必须将渲染窗口的整个背景和旧图像擦除（或清除）干净 默认行为： 擦除开启 步骤：清除屏幕 → 绘制新的一帧（物体的新位置）→ 显示 效果： 产生平滑、连续的动画效果。 关闭擦除： 步骤： 不清除屏幕 → 直接在旧图像上绘制新的一帧（物体的新位置）→ 显示。 效果： 每次渲染的物体图像都会保留在屏幕上，形成一种 “残影” 或 “轨迹叠加” 的效果。物体在连续运动中所经过的路径会被全部显示出来 """ renWin.EraseOff() iren.Start() if __name__ == '__main__': main()
