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c++ - 如何获取 TopoDS_Face 的质心坐标?

转载 作者:行者123 更新时间:2023-11-30 01:35:02 25 4
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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

根据@jaba 的建议,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);
}

最佳答案

计算 TopoDS_Face 质心的 Open CASCADE 方法是

TopoDS_Face face = ...;

GProp_GProps shellProps;
BRepGProp::SurfaceProperties(face, shellProps);

if (shellProps.Mass() < Precision::Confusion())
{
throw Exception("Failed to Calculate the area of the face.", __TRACE__);
}

const gp_Pnt centerOfMass = shellProps.CentreOfMass();

这应该会给出正确的结果。如果面不受凸多边形的约束,其中面的顶点是多边形点,此代码应该仍然有效,但多边形方法可能会失败。

关于c++ - 如何获取 TopoDS_Face 的质心坐标?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/54901561/

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