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相机参数的获取与保存
二：代码及注释
import vtkmodules.vtkInteractionStyle import vtkmodules.vtkRenderingOpenGL2 from vtkmodules.vtkCommonColor import vtkNamedColors from vtkmodules.vtkFiltersSources import vtkConeSource from vtkmodules.vtkRenderingCore import vtkPolyDataMapper, vtkActor, vtkCamera, vtkRenderWindow, \ vtkRenderWindowInteractor, vtkRenderer from vtkmodules.vtkInteractionStyle import vtkInteractorStyleTrackballCamera from time import sleep def comma_separated_list(v, precision=6, width=10): res = list() for p in v: res.append(f'{p:{width}.{precision}f}') return ','.join(res) def get_orientation(render_): p = {} camera = render_.GetActiveCamera() p['position'] = camera.GetPosition() p['focal_point'] = camera.GetFocalPoint() p['view_up'] = camera.GetViewUp() p['distance'] = camera.GetDistance() p['clipping_range'] = camera.GetClippingRange() p['orientation'] = camera.GetOrientation() return p def set_orientation(ren, p): """ Set the orientation of the camera. :param ren: The renderer. :param p: The orientation parameters. :return: """ camera = ren.GetActiveCamera() camera.SetPosition(p['position']) camera.SetFocalPoint(p['focal_point']) camera.SetViewUp(p['view_up']) camera.SetDistance(p['distance']) camera.SetClippingRange(p['clipping_range']) def main(): """ 下列代码中多次出现ren_win.Render() 它的主要作用是触发渲染窗口的绘图过程 在3D渲染中，执行一次 Render() 命令意味着让 VTK 检查所有渲染器、摄像机和3D对象，然后根据最新的状态将最终图像绘制到屏幕上 """ colors = vtkNamedColors() cone = vtkConeSource() cone.SetHeight(3.0) cone.SetRadius(1.0) cone.SetResolution(10) cone.Update() cone_mapper = vtkPolyDataMapper() cone_mapper.SetInputConnection(cone.GetOutputPort()) cone_actor = vtkActor() cone_actor.SetMapper(cone_mapper) cone_actor.GetProperty().SetColor(colors.GetColor3d("Bisque")) ren = vtkRenderer() ren.AddActor(cone_actor) ren.SetBackground(colors.GetColor3d("MidnightBlue")) ren_win = vtkRenderWindow() ren_win.AddRenderer(ren) ren_win.SetSize(600, 600) ren_win.SetWindowName("ResetCameraOrientation") iren = vtkRenderWindowInteractor() iren.SetRenderWindow(ren_win) style = vtkInteractorStyleTrackballCamera() iren.SetInteractorStyle(style) camera = ren.GetActiveCamera() camera.SetRoll(15) # 横向旋转角15° camera.Elevation(-15) # 俯仰角-15° camera.Azimuth(30) # 绕着世界坐标系的Y轴旋转30° ren.ResetCamera() ren_win.Render() original_orient = get_orientation(ren) s = f'{"Original orientation:":23s}' s += comma_separated_list(original_orient["orientation"]) print(s) sleep(1) camera.SetPosition(-3.568189, 5.220048, 2.352639) camera.SetFocalPoint(-0.399044, -0.282865, 0.131438) camera.SetViewUp(0.623411, 0.573532, -0.531431) camera.SetDistance(6.727500) camera.SetClippingRange(3.001430, 11.434082) ren_win.Render() new_orient = get_orientation(ren) s = f'{"New orientation:":23s}' s += comma_separated_list(new_orient["orientation"]) print(s) sleep(1) print('Reloading the original orientation.') set_orientation(ren, original_orient) ren_win.Render() check = get_orientation(ren) s = f'{"Final orientation:":23s}' s += comma_separated_list(check["orientation"]) print(s) sleep(1) iren.Initialize() iren.Start() if __name__ == '__main__': main()
