【VTKExamples::Meshes】第一期 FillHoles

很高兴在雪易的CSDN遇见你 

VTK技术爱好者 QQ：870202403

---

前言

本文分享VTKExamples的Meshes模块中的FillHoles样例，涉及vtkFillHolesFilter & vtkPolyDataNormals接口，希望对各位小伙伴有所帮助！

感谢各位小伙伴的点赞+关注，小易会继续努力分享，一起进步！

你的点赞就是我的动力(＾Ｕ＾)ノ~ＹＯ

---

目录

前言

1. VTK自带样例

2. 优化后的样例

结论：

---

1. VTK自带样例

        examples.vtk.org/site/Cxx/Meshes/FillHoles/

         

        存在问题：填补的区域的法向量与输入部分的向量不同，需优化 

2. 优化后的样例

        

 左下角为：将Normals的输出，添加到Renderer后的结果。

右下角为：将输入的PointData_normals数据输入到normals的输出PointData中，结果OK。

void zxExampleMesh::FillHoles()
{
    vtkSmartPointer input =
        ReadPolyData("F:\\vtk\\VTKExamples-master\\src\\Testing\\Data\\Torso.vtp");
    /*vtkSmartPointer input =
        ReadPolyData("F:\\MP_Project\\zxVTKLib\\ztInteractionApplication\\TestData\\Mesh\\testFillHoles.stl");*/

    vtkSmartPointer colors =
        vtkSmartPointer::New();

    vtkSmartPointer fillHolesFilter =
        vtkSmartPointer::New();
    fillHolesFilter->SetInputData(input);
    fillHolesFilter->SetHoleSize(100000.0);
    fillHolesFilter->Update();

    // Make the triangle winding order consistent
    vtkSmartPointer normals =
        vtkSmartPointer::New();
    normals->SetInputData(fillHolesFilter->GetOutput());
    normals->ConsistencyOn();
    normals->SplittingOff();
    normals->Update();

    // Visualize
    // Define viewport ranges
    // (xmin, ymin, xmax, ymax)    
    double Viewport1[4] = { 0.0, 0.5, 0.5, 1.0 };
    double Viewport2[4] = { 0.5, 0.5, 1.0, 1.0 };
    double Viewport3[4] = { 0.0, 0.0, 0.5, 0.5 };
    double Viewport4[4] = { 0.5, 0.0, 1.0, 0.5 };

    // Create a mapper and actor
    vtkSmartPointer originalMapper =
        vtkSmartPointer::New();
    originalMapper->SetInputData(input);

    vtkSmartPointer backfaceProp =
        vtkSmartPointer::New();
    backfaceProp->SetDiffuseColor(1., 0., 0.);

    vtkSmartPointer originalActor =
        vtkSmartPointer::New();
    originalActor->SetMapper(originalMapper);
    originalActor->SetBackfaceProperty(backfaceProp);
    originalActor->GetProperty()->SetDiffuseColor(
        colors->GetColor3d("Flesh").GetData());

    vtkSmartPointer filledMapper =
        vtkSmartPointer::New();
    filledMapper->SetInputData(fillHolesFilter->GetOutput());

    vtkSmartPointer filledActor =
        vtkSmartPointer::New();
    filledActor->SetMapper(filledMapper);
    filledActor->GetProperty()->SetDiffuseColor(
        colors->GetColor3d("Flesh").GetData());
    filledActor->SetBackfaceProperty(backfaceProp);

    vtkPolyData* normalPD = vtkPolyData::New();
    normalPD->DeepCopy(normals->GetOutput());
    vtkSmartPointer normalMapper =
        vtkSmartPointer::New();
    normalMapper->SetInputData(normalPD);

    vtkSmartPointer normalActor =
        vtkSmartPointer::New();
    normalActor->SetMapper(normalMapper);
    normalActor->GetProperty()->SetDiffuseColor(
        colors->GetColor3d("Flesh").GetData());
    normalActor->SetBackfaceProperty(backfaceProp);

#if 1
    // Restore the original normals
    normals->GetOutput()->GetPointData()->
        SetNormals(input->GetPointData()->GetNormals());
#endif

    vtkSmartPointer normalMapper2 =
        vtkSmartPointer::New();
    normalMapper2->SetInputData(normals->GetOutput());

    vtkSmartPointer normalActor2 =
        vtkSmartPointer::New();
    normalActor2->SetMapper(normalMapper2);
    normalActor2->GetProperty()->SetDiffuseColor(
        colors->GetColor3d("Flesh").GetData());
    normalActor2->SetBackfaceProperty(backfaceProp);

    // Create a renderer, render window, and interactor
    vtkSmartPointer Renderer1 =
        vtkSmartPointer::New();
    Renderer1->SetViewport(Viewport1);

    vtkSmartPointer Renderer2 =
        vtkSmartPointer::New();
    Renderer2->SetViewport(Viewport2);

    vtkSmartPointer Renderer3 =
        vtkSmartPointer::New();
    Renderer3->SetViewport(Viewport3);

    vtkSmartPointer Renderer4 =
        vtkSmartPointer::New();
    Renderer4->SetViewport(Viewport4);

    vtkSmartPointer renderWindow =
        vtkSmartPointer::New();
    renderWindow->SetSize(600, 300);

    renderWindow->AddRenderer(Renderer1);
    renderWindow->AddRenderer(Renderer2);
    renderWindow->AddRenderer(Renderer3);
    renderWindow->AddRenderer(Renderer4);

    vtkSmartPointer renderWindowInteractor =
        vtkSmartPointer::New();
    renderWindowInteractor->SetRenderWindow(renderWindow);

    // Add the actor to the scene
    Renderer1->AddActor(originalActor);
    Renderer2->AddActor(filledActor);
    Renderer3->AddActor(normalActor);
    Renderer4->AddActor(normalActor2);
    Renderer1->SetBackground(colors->GetColor3d("PaleGreen").GetData());
    Renderer3->SetBackground(colors->GetColor3d("LightGreen").GetData());

    Renderer1->GetActiveCamera()->SetPosition(0, -1, 0);
    Renderer1->GetActiveCamera()->SetFocalPoint(0, 0, 0);
    Renderer1->GetActiveCamera()->SetViewUp(0, 0, 1);
    Renderer1->GetActiveCamera()->Azimuth(30);
    Renderer1->GetActiveCamera()->Elevation(30);

    Renderer1->ResetCamera();

    Renderer2->SetBackground(colors->GetColor3d("LightGreen").GetData());
    Renderer4->SetBackground(colors->GetColor3d("PaleGreen").GetData());

    // Share the camera

    Renderer2->SetActiveCamera(Renderer1->GetActiveCamera());
    Renderer3->SetActiveCamera(Renderer1->GetActiveCamera());
    Renderer4->SetActiveCamera(Renderer1->GetActiveCamera());
    // Render and interact
    renderWindow->Render();

    renderWindowInteractor->Start();
}

vtkSmartPointer zxExampleMesh::ReadPolyData(const char* fileName)
{
    vtkSmartPointer polyData;
    std::string extension = vtksys::SystemTools::GetFilenameExtension(std::string(fileName));
    if (extension == ".ply")
    {
        vtkSmartPointer reader =
            vtkSmartPointer::New();
        reader->SetFileName(fileName);
        reader->Update();
        polyData = reader->GetOutput();
    }
    else if (extension == ".vtp")
    {
        vtkSmartPointer reader =
            vtkSmartPointer::New();
        reader->SetFileName(fileName);
        reader->Update();
        polyData = reader->GetOutput();
    }
    else if (extension == ".obj")
    {
        vtkSmartPointer reader =
            vtkSmartPointer::New();
        reader->SetFileName(fileName);
        reader->Update();
        polyData = reader->GetOutput();
    }
    else if (extension == ".stl")
    {
        vtkSmartPointer reader =
            vtkSmartPointer::New();
        reader->SetFileName(fileName);
        reader->Update();
        polyData = reader->GetOutput();
    }
    else if (extension == ".vtk")
    {
        vtkSmartPointer reader =
            vtkSmartPointer::New();
        reader->SetFileName(fileName);
        reader->Update();
        polyData = reader->GetOutput();
    }
    else if (extension == ".g")
    {
        vtkSmartPointer reader =
            vtkSmartPointer::New();
        reader->SetGeometryFileName(fileName);
        reader->Update();
        polyData = reader->GetOutput();
    }
    else
    {
        vtkSmartPointer source =
            vtkSmartPointer::New();
        source->Update();
        polyData = source->GetOutput();
    }
    return polyData;
}

结论：

感谢各位小伙伴的点赞+关注，小易会继续努力分享，一起进步！

你的赞赏是我的最最最最大的动力(＾Ｕ＾)ノ~ＹＯ