Activiz快速显示大量球体

之前学习了下activiz，可以通过以下方式显示球体

vtkSphereSource sphere = vtkSphereSource.New();      // 新建球
vtkShrinkPolyData shrink = vtkShrinkPolyData.New();  // 新建数据收缩操作器
shrink.SetInputConnection(sphere.GetOutputPort());   // 连接管道
shrink.SetShrinkFactor(1.0);
vtkPolyDataMapper sphereMapper = vtkPolyDataMapper.New();    // 新建制图器
sphereMapper.SetInputConnection(shrink.GetOutputPort());     // 连接管道
vtkActor sphereActor = vtkActor.New();                    // 新建角色
sphereActor.SetMapper(sphereMapper);                      // 传递制图器
renderer.AddActor(sphereActor);
sphere.SetCenter(top_xyz[0], top_xyz[1], top_xyz[2]);
sphere.SetThetaResolution(8);                        // 设置球纬度参数
sphere.SetPhiResolution(16);                         // 设置球经度参数
sphere.SetRadius(0.1);                               // 设置球的半径   
sphereActor.GetProperty().SetColor(1, 0, 0);              // 设置“角色”颜色[RGB]

但现在我需要显示大量球体，不想通过循环上面的代码或者搞很多个Actor来显示

我测试了100个球体的显示

用以下方法更快显示出来，同时还能设置颜色和大小

void ShowManySpheres()
{
    vtkRenderWindow renderWindow = renderWindowControl1.RenderWindow;
    vtkRenderer render = renderWindow.GetRenderers().GetFirstRenderer();
    vtkPoints vtkpoints = vtkPoints.New();
 
    vtkFloatArray scales=vtkFloatArray.New();
    scales.SetName("scales");
 
    vtkFloatArray col=vtkFloatArray.New();
    col.SetName("col");
 
    // setup lookupTable and add some colors
    vtkLookupTable colors = vtkLookupTable.New();
    colors.SetNumberOfTableValues(4);
    colors.SetTableValue(0, 1.0, 0.0, 0.0, 1.0);  //red
    colors.SetTableValue(1, 0.0, 1.0, 0.0, 1.0);  //green
    colors.SetTableValue(2, 0.0, 0.0, 1.0, 1.0);  //blue
    colors.SetTableValue(3, 1.0, 1.0, 0.0, 1.0);  //yellow
    // the last double value is for opacity (1->max, 0->min)
 
    for (int i = 0; i < 100; i++)
    {
        vtkpoints.InsertPoint(i, 15 * Math.Cos(i * Math.PI / 50), 15 * Math.Sin(i * Math.PI / 50), 0); // sphere in circle
        scales.InsertNextValue(0.5f); // random radius between 0 and 0.99
        col.InsertNextValue((i*1.0f) % 4); // random color label
    }
 
    // grid structured to append center, radius and color label
    vtkUnstructuredGrid grid = vtkUnstructuredGrid.New();
    grid.SetPoints(vtkpoints);
    grid.GetPointData().AddArray(scales);
    grid.GetPointData().SetActiveScalars("scales"); // !!!to set radius first
    grid.GetPointData().AddArray(col);
 
    // create anything you want here, we will use a sphere for the demo
    vtkSphereSource sphereSource = vtkSphereSource.New();
 
    // object to group sphere and grid and keep smooth interaction
    vtkGlyph3D glyph3D = vtkGlyph3D.New();
    glyph3D.SetInput(grid);
    glyph3D.SetSourceConnection(sphereSource.GetOutputPort());
 
    // create a mapper and actor
    vtkPolyDataMapper mapper = vtkPolyDataMapper.New();
    mapper.SetInputConnection(glyph3D.GetOutputPort());
    mapper.SetScalarModeToUsePointFieldData(); // without, color are displayed regarding radius and not color label
    mapper.SetScalarRange(0,3); // to scale color label (without, col should be between 0 and 1)
    mapper.SelectColorArray("col"); // !!!to set color (nevertheless you will have nothing)
    mapper.SetLookupTable(colors);
    
    vtkActor actor = vtkActor.New();
    actor.SetMapper(mapper);
    render.AddActor(actor);
 
    render.ResetCamera();
    Refresh();
    
}