VTK默认透视投影（近大远小），如果想改成正交投影（平行投影，远近一样）：
1.调用vtkCamera的ParallelProjectionOn函数开启
2.通过vtkCamera的SetParallelScale缩放
3.通过vtkCamera的SetClippingRange设置前后裁剪平面
关键代码如下：
//开启正交投影模式 renderer->GetActiveCamera()->ParallelProjectionOn(); renderer->GetActiveCamera()->SetParallelScale(10); renderer->GetActiveCamera()->SetClippingRange(-1000, 1000);
全部代码：
QSurfaceFormat::setDefaultFormat(QVTKOpenGLNativeWidget::defaultFormat()); //平面 vtkNew<vtkPlaneSource> plane; plane->SetCenter(0, 0, 0);//设置平面中心点坐标 plane->SetOrigin(-10, -10, 0);//设置平面起点坐标，一般为平面左下角 plane->SetPoint1(10, -10, 0);//设置平面第一条轴的长度 plane->SetPoint2(-10, 10, 0);//设置平面第二条轴的长度 plane->SetNormal(0, 0, 1);//设置平面的法向量 plane->SetXResolution(10);//x方向分割数 plane->SetYResolution(10);//y方向分割数 vtkNew<vtkPolyDataMapper> planeMapper; planeMapper->SetInputConnection(plane->GetOutputPort()); vtkNew<vtkActor> planeActor; planeActor->SetMapper(planeMapper); planeActor->GetProperty()->EdgeVisibilityOn(); //显示线框 renderer->AddActor(planeActor); //球 vtkNew<vtkSphereSource> sphereSource; sphereSource->SetRadius(5); sphereSource->SetCenter(5, 0, 0); sphereSource->Update(); vtkNew<vtkPolyDataMapper> sphereMapper; sphereMapper->SetInputConnection(sphereSource->GetOutputPort()); vtkNew<vtkActor> sphereActor; sphereActor->SetMapper(sphereMapper); sphereActor->GetProperty()->SetColor(colors->GetColor4d("Green").GetData()); sphereActor->GetProperty()->EdgeVisibilityOn(); //显示线框 renderer->AddActor(sphereActor); //开启正交投影模式 renderer->GetActiveCamera()->ParallelProjectionOn(); renderer->GetActiveCamera()->SetParallelScale(10); renderer->GetActiveCamera()->SetClippingRange(-1000, 1000); renderer->SetBackground(colors->GetColor3d("SteelBlue").GetData()); vtkNew<vtkGenericOpenGLRenderWindow> renderWindow; renderWindow->AddRenderer(renderer); renderWindow->SetWindowName("RenderWindowNoUIFile"); ui.vtk_main->setRenderWindow(renderWindow);