除了 TopoDS_Vertex 之外,我们还可以通过以下方式获取坐标:
int i=0;
exp0.Init(shape, TopAbs_VERTEX);
for(exp0.Init(shape, TopAbs_VERTEX); exp0.More(); exp0.Next()) {
TopoDS_Vertex vertex = TopoDS::Vertex(exp0.Current());
gp_Pnt pnt = BRep_Tool::Pnt(vertex);
cout <<"Edge " << i << ": X: " << pnt.X() << " - Y:" << pnt.Y() << " - Z: " << pnt.Z();
i++;
}
我想知道是否有类似的机制来获取 TopoDS_Face 的坐标。
编辑
在@jaba 的建议下,这就是我计算一系列点的质心的方法:
vtkSmartPointer<vtkPoints> facePoints = vtkSmartPointer<vtkPoints>::New();
int i=0;
for(exp0.Init(shape, TopAbs_FACE); exp0.More(); exp0.Next(), i++, count++) {
facePoints->Reset();
TopoDS_Face aFace = TopoDS::Face(exp0.Current());
for (TopExp_Explorer Vex(aFace, TopAbs_VERTEX); Vex.More(); Vex.Next()) {
TopoDS_Vertex vertex = TopoDS::Vertex(Vex.Current());
gp_Pnt pnt = BRep_Tool::Pnt(vertex);
facePoints->InsertNextPoint(p);
}
vtkSmartPointer<vtkPolyData> polydata = vtkSmartPointer<vtkPolyData>::New();
polydata->SetPoints(facePoints);
// Compute the center of mass
vtkSmartPointer<vtkCenterOfMass> centerOfMassFilter = vtkSmartPointer<vtkCenterOfMass>::New();
centerOfMassFilter->SetInputData(polydata);
centerOfMassFilter->SetUseScalarsAsWeights(false);
centerOfMassFilter->Update();
double center[3];
centerOfMassFilter->GetCenter(center);
}