/// <summary>
/// 读取stl文件，并在窗口进行显示，并设置全局变量originalMesh
/// </summary>
private void ReadSTL()
{
//Path to vtk data must be set as an environment variable
//VTK_DATA_ROOT=""
vtkSTLReader reader = vtkSTLReader.New();
reader.SetFileName(FileFullName);
reader.Update();
mapper = vtkPolyDataMapper.New();
mapper.SetInputConnection(reader.GetOutputPort());
actor = vtkActor.New();
actor.SetMapper(mapper);
//get a reference to the renderwindow of our renderWindowControll
renderWindow = renderWindowControl1.RenderWindow;
//renderer
renderer = renderWindow.GetRenderers().GetFirstRenderer();
//移除之前所有prop
renderer.RemoveAllViewProps();
//set background color
renderer.SetBackground(0.2, 0.3, 0.4);
//add our actor to the renderer
renderer.AddActor(actor);
originalMesh = vtkPolyData.New();
originalMesh.DeepCopy(reader.GetOutput());
tb_numOfPoint.Text = originalMesh.GetNumberOfPoints().ToString();
//creat a cell picker
picker = vtkCellPicker.New();
vtkRenderWindowInteractor iren = renderWindow.GetInteractor();
iren.SetPicker(picker);
renderer.ResetCamera();
renderWindow.Render();
}
/// <summary>
/// Subdivides a vtkPolyData into pieces containing max. MaxVertices.
/// </summary>
/// <param name="pd">The pd.</param>
/// <returns>A list of vtkPolyData</returns>
private static List<vtkPolyData> Subdivide(vtkPolyData pd)
{
var pds = new List<vtkPolyData>();
if (pd.GetNumberOfPoints() <= MaxVertices)
{
// Debug.Log("No subdivide neccessary. " + pd.GetNumberOfPoints());
pds.Add(pd);
return pds;
}
var dicer = vtkOBBDicer.New();
dicer.SetInput(pd);
dicer.SetNumberOfPointsPerPiece(MaxVertices);
dicer.SetDiceModeToNumberOfPointsPerPiece();
dicer.Update();
// Debug.Log("Subdivided into " + dicer.GetNumberOfActualPieces() + " pieces.");
var threshold = vtkThreshold.New();
pd = vtkPolyData.SafeDownCast(dicer.GetOutput());
threshold.SetInput(pd);
threshold.SetInputArrayToProcess(0, 0, 0,
(int)vtkDataObject.FieldAssociations.FIELD_ASSOCIATION_POINTS,
"vtkOBBDicer_GroupIds");
var geometry = vtkGeometryFilter.New();
geometry.SetInputConnection(threshold.GetOutputPort());
for(var i = 0; i < dicer.GetNumberOfActualPieces(); i++)
{
threshold.ThresholdBetween(i, i);
geometry.Update();
// Last submesh needs not to be copied
if (i == dicer.GetNumberOfActualPieces() - 1)
pds.Add(geometry.GetOutput());
else
{
var copiedOutput = new vtkPolyData();
copiedOutput.DeepCopy(geometry.GetOutput());
pds.Add(copiedOutput);
}
}
return pds;
}
