c++ vtk创建100*100网格

使用VTK库创建一个100*100网格的步骤如下：

1. 包含VTK库的头文件：

#include <vtkSmartPointer.h>
#include <vtkPoints.h>
#include <vtkCellArray.h>
#include <vtkPolyData.h>
#include <vtkPolyDataMapper.h>
#include <vtkActor.h>
#include <vtkRenderer.h>
#include <vtkRenderWindow.h>
#include <vtkRenderWindowInteractor.h>

2. 创建点集：

vtkSmartPointer<vtkPoints> points = vtkSmartPointer<vtkPoints>::New();
for(int i=0; i<100; i++){
    for(int j=0; j<100; j++){
        points->InsertNextPoint(i, j, 0);
    }
}

3. 创建网格单元：

vtkSmartPointer<vtkCellArray> cells = vtkSmartPointer<vtkCellArray>::New();
for(int i=0; i<99; i++){
    for(int j=0; j<99; j++){
        vtkSmartPointer<vtkQuad> quad = vtkSmartPointer<vtkQuad>::New();
        quad->GetPointIds()->SetId(0, i*100+j);
        quad->GetPointIds()->SetId(1, i*100+j+1);
        quad->GetPointIds()->SetId(2, (i+1)*100+j+1);
        quad->GetPointIds()->SetId(3, (i+1)*100+j);
        cells->InsertNextCell(quad);
    }
}

4. 使用点集和网格单元创建多边形数据：

vtkSmartPointer<vtkPolyData> polydata = vtkSmartPointer<vtkPolyData>::New();
polydata->SetPoints(points);
polydata->SetPolys(cells);

5. 创建渲染器、映射器和演员：

vtkSmartPointer<vtkPolyDataMapper> mapper = vtkSmartPointer<vtkPolyDataMapper>::New();
mapper->SetInputData(polydata);

vtkSmartPointer<vtkActor> actor = vtkSmartPointer<vtkActor>::New();
actor->SetMapper(mapper);

vtkSmartPointer<vtkRenderer> renderer = vtkSmartPointer<vtkRenderer>::New();
renderer->AddActor(actor);
renderer->SetBackground(0.1, 0.2, 0.4);

6. 创建窗口交互器并运行：

vtkSmartPointer<vtkRenderWindow> renderWindow = vtkSmartPointer<vtkRenderWindow>::New();
renderWindow->AddRenderer(renderer);
renderWindow->SetSize(800, 800);

vtkSmartPointer<vtkRenderWindowInteractor> interactor = vtkSmartPointer<vtkRenderWindowInteractor>::New();
interactor->SetRenderWindow(renderWindow);

renderWindow->Render();
interactor->Start();

这样就创建了一个100*100的网格并显示在窗口中。