vtk可视化三维数组

要使用VTK可视化三维数组，需要将数组转换为VTK数据对象。以下是一些简单的步骤：

1. 导入必要的VTK库和头文件。

#include <vtkSmartPointer.h>
#include <vtkStructuredPoints.h>
#include <vtkStructuredPointsReader.h>
#include <vtkStructuredPointsWriter.h>

2. 创建一个vtkStructuredPoints对象并设置其属性。

vtkSmartPointer<vtkStructuredPoints> structuredPoints = vtkSmartPointer<vtkStructuredPoints>::New();
structuredPoints->SetDimensions(xDim, yDim, zDim); // 设置数组的维度
structuredPoints->SetOrigin(0, 0, 0); // 设置原点
structuredPoints->SetSpacing(1, 1, 1); // 设置间距

3. 将数组数据添加到vtkStructuredPoints对象中。

vtkSmartPointer<vtkDoubleArray> dataArray = vtkSmartPointer<vtkDoubleArray>::New();
dataArray->SetName("Data"); // 设置数组的名称
dataArray->SetNumberOfComponents(1);
dataArray->SetNumberOfTuples(xDim * yDim * zDim);
for(int i = 0; i < xDim; i++)
{
    for(int j = 0; j < yDim; j++)
    {
        for(int k = 0; k < zDim; k++)
        {
            double value = array[i][j][k]; // 从数组中获取数据
            dataArray->SetValue(i * yDim * zDim + j * zDim + k, value); // 将数据添加到vtkDoubleArray对象中
        }
    }
}
structuredPoints->GetPointData()->SetScalars(dataArray); // 将vtkDoubleArray对象添加到vtkStructuredPoints对象中

4. 创建一个vtkStructuredPointsWriter对象并将vtkStructuredPoints对象写入文件。

vtkSmartPointer<vtkStructuredPointsWriter> writer = vtkSmartPointer<vtkStructuredPointsWriter>::New();
writer->SetFileName(filename.c_str()); // 设置文件名
writer->SetInputData(structuredPoints); // 设置写入数据对象
writer->Write(); // 写入文件

5. 最后，使用VTK可视化工具显示vtkStructuredPoints对象。

vtkSmartPointer<vtkRenderWindow> renderWindow = vtkSmartPointer<vtkRenderWindow>::New();
vtkSmartPointer<vtkRenderer> renderer = vtkSmartPointer<vtkRenderer>::New();
renderWindow->AddRenderer(renderer);
vtkSmartPointer<vtkStructuredPointsReader> reader = vtkSmartPointer<vtkStructuredPointsReader>::New();
reader->SetFileName(filename.c_str()); // 读取文件
vtkSmartPointer<vtkStructuredPointsMapper> mapper = vtkSmartPointer<vtkStructuredPointsMapper>::New();
mapper->SetInputConnection(reader->GetOutputPort()); // 设置vtkStructuredPoints对象
vtkSmartPointer<vtkActor> actor = vtkSmartPointer<vtkActor>::New();
actor->SetMapper(mapper);
renderer->AddActor(actor);
vtkSmartPointer<vtkInteractorStyleTrackballCamera> interactorStyle = vtkSmartPointer<vtkInteractorStyleTrackballCamera>::New();
vtkSmartPointer<vtkRenderWindowInteractor> renderWindowInteractor = vtkSmartPointer<vtkRenderWindowInteractor>::New();
renderWindowInteractor->SetInteractorStyle(interactorStyle);
renderWindowInteractor->SetRenderWindow(renderWindow);
renderWindowInteractor->Initialize();
renderWindowInteractor->Start();

以上就是使用VTK可视化三维数组的基本步骤。