如何在C++中编写带有 VTK 的标量文件

How to write scalar filed with VTK in C++?

本文关键字：VTK 标量 文件 C++      更新时间：2023-10-16

我开始了解VTK。我想在 .vts 文件中写入一个标量字段。结构化网格是使用下面包含的代码生成的。

我尝试在用户指南和教程中查找信息，但我无法做到。

// Create a grid
vtkSmartPointer<vtkStructuredGrid> structuredGrid = vtkSmartPointer<vtkStructuredGrid>::New();
vtkSmartPointer<vtkPoints> points = vtkSmartPointer<vtkPoints>::New();
unsigned int numi = 20;
unsigned int numj = 30;
unsigned int numk = 1;
for (unsigned int k = 0; k < numk; k++) {
    for (unsigned int j = 0; j < numj; j++) {
        for (unsigned int i = 0; i < numi; i++) {
            points->InsertNextPoint(i, j, k);
        }
    }
}
// Specify the dimensions of the grid
structuredGrid->SetDimensions(numi, numj, numk);
structuredGrid->SetPoints(points);
// Write file
vtkSmartPointer<vtkXMLStructuredGridWriter> writer = vtkSmartPointer<vtkXMLStructuredGridWriter>::New();
writer->SetFileName("output.vts");
writer->SetInputData(structuredGrid);
writer->Write();

可以为 vtkStructuredGrid 对象的属性 PointData 设置标量。
然后 vtkXMLStructuredGridWriter 对象在 vts 文件中写入 structuredGrid，如下所示：

    vtkFloatArray *scalars = vtkFloatArray::New();
    for (int i=0; i< numi*numj*numk; i++) scalars->InsertTuple1(i, 1.0 * i /(numi*numj*numk));
    structuredGrid->GetPointData()->SetScalars( scalars );
    // Write file
    vtkSmartPointer<vtkXMLStructuredGridWriter> writer = vtkSmartPointer<vtkXMLStructuredGridWriter>::New();
    writer->SetFileName("output.vts");
    writer->SetInputData(structuredGrid);
    writer->Write();
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