是否可以使用VTK中的（polyData）編寫器來處理來自其他庫的數據類型？

Question

我使用ParaView進行數據可視化，因此我需要以支持的格式（如ASCII .vtk）編寫自己的數據。爲此，我寫了一個傳統的ASCII .vtk作家，並且它工作正常。但是，由於我編寫了一個並行運行的寫密集型應用程序，因此我想嘗試一下vtk XML writer。

是否有可能重新使用來自其他庫的類的作家？

從看vtkPolyDataWriter documentation，我注意到，VTK是面向對象和作家在很大程度上依賴於「可視化管道」從vtkPolyData Example流使用的端口，例如：

353  vtkNew<vtkPolyDataWriter> writer0; 
354  writer0->SetFileName("./hyperTreeGridContour.vtk"); 
355  writer0->SetInputConnection(contour->GetOutputPort()); 
356  writer0->Write(); 

。

然後可以重新使用the writers與VTK層次結構之外的類嗎？

可寫對象應該是一個vtkObject類，但vtkPolyData類在末尾被寫出，它更依賴於VTK特定的類型。

Answer 1

不需要做任何事情。只需要一個使用VTK類的WriteVTKPolyData（）方法。

#include <vtkXMLPolyDataWriter.h> 
#include <vtkSmartPointer.h> 
#include <vtkCellArray.h> 
#include <vtkPolyData.h> 
#include <vtkVersion.h> 
#include <vtkPoints.h> 
class MyClass { 
    /* ... */ 
public: 
    void WriteVTKPolyData(const char * file_name) const; 
}; 
void MyClass::WriteVTKPolyData(const char * file_name) const { 
    vtkSmartPointer<vtkPolyData> polyData = 
    vtkSmartPointer<vtkPolyData>::New(); 
    vtkSmartPointer<vtkPoints> points = 
    vtkSmartPointer<vtkPoints>::New(); 
    // EXAMPLE CODE POPULATING VTKPOLYDATA 
    points->InsertNextPoint(+1, +1, +1); 
    points->InsertNextPoint(-1, -1, +1); 
    points->InsertNextPoint(-1, +1, -1); 
    points->InsertNextPoint(+1, -1, -1); 
    polyData->SetPoints(points); 
    vtkSmartPointer<vtkCellArray> polys = 
    vtkSmartPointer<vtkCellArray>::New(); 
    vtkIdType cell[3]; 
    cell[0] = 0; cell[1] = 2; cell[2] = 1; 
    polys->InsertNextCell(3,cell); 
    cell[0] = 1; cell[1] = 2; cell[2] = 3; 
    polys->InsertNextCell(3,cell); 
    cell[0] = 2; cell[1] = 0; cell[2] = 3; 
    polys->InsertNextCell(3,cell); 
    cell[0] = 3; cell[1] = 0; cell[2] = 1; 
    polys->InsertNextCell(3,cell); 
    polyData->SetPolys(polys); 
    // END EXAMPLE CODE POPULATING 
    vtkSmartPointer<vtkXMLPolyDataWriter> writer = 
    vtkSmartPointer<vtkXMLPolyDataWriter>::New(); 
    writer->SetFileName(file_name); 
    #if VTK_MAJOR_VERSION <= 5 
    writer->SetInput(polyData); 
    #else 
    writer->SetInputData(polyData); 
    #endif 
    writer->Write(); 
} 

int main(int argc, char ** argv) { 
    MyClass myObject; 
    myObject.WriteVTKPolyData("out.vtp"); 
} 

如果你想保持點和多邊形的內存，你編輯：

#include <vtkXMLPolyDataWriter.h> 
#include <vtkSmartPointer.h> 
#include <vtkCellArray.h> 
#include <vtkPolyData.h> 
#include <vtkVersion.h> 
#include <vtkPoints.h> 
class MyClass { 
    vtkSmartPointer<vtkPolyData> m_PolyData; 
    vtkSmartPointer<vtkPoints> m_Points; 
    vtkSmartPointer<vtkCellArray> m_Polygons; 
    /* ... */ 
public: 
    /* ... */ 
    MyClass(); 
    void WriteVTKPolyData(const char * file_name) const; 
    void f(); 
}; 
MyClass::MyClass() : 
    m_PolyData(vtkSmartPointer<vtkPolyData>::New()), 
    m_Points(vtkSmartPointer<vtkPoints>::New()), 
    m_Polygons(vtkSmartPointer<vtkCellArray>::New()) 
{ 
    m_PolyData->SetPoints(m_Points); 
    m_PolyData->SetPolys(m_Polygons); 
} 
void MyClass::f() { 
    // EXAMPLE CODE POPULATING VTKPOLYDATA 
    m_Points->InsertNextPoint(+1, +1, +1); 
    m_Points->InsertNextPoint(-1, -1, +1); 
    m_Points->InsertNextPoint(-1, +1, -1); 
    m_Points->InsertNextPoint(+1, -1, -1); 
    vtkIdType cell[3]; 
    cell[0] = 0; cell[1] = 2; cell[2] = 1; 
    m_Polygons->InsertNextCell(3,cell); 
    cell[0] = 1; cell[1] = 2; cell[2] = 3; 
    m_Polygons->InsertNextCell(3,cell); 
    cell[0] = 2; cell[1] = 0; cell[2] = 3; 
    m_Polygons->InsertNextCell(3,cell); 
    cell[0] = 3; cell[1] = 0; cell[2] = 1; 
    m_Polygons->InsertNextCell(3,cell); 
    // END EXAMPLE CODE POPULATING 
} 
void MyClass::WriteVTKPolyData(const char * file_name) const { 
    vtkSmartPointer<vtkXMLPolyDataWriter> writer = 
    vtkSmartPointer<vtkXMLPolyDataWriter>::New(); 
    writer->SetFileName(file_name); 
    #if VTK_MAJOR_VERSION <= 5 
    writer->SetInput(m_PolyData); 
    #else 
    writer->SetInputData(m_PolyData); 
    #endif 
    writer->Write(); 
} 

int main(int argc, char ** argv) { 
    MyClass myObject; 
    myObject.f(); 
    myObject.WriteVTKPolyData("out.vtp"); 
}