OpenCascade使用___三角面片细分与重组（转）

GeomConvert------- BSpline曲线、曲面拆分，Handle(Geom_Curve)转BSpline曲线

BRepExtrema_DistShapeShape------求两个TopoDS_Shape（TopoDS_Face、TopoDS_Vertex、TopoDS_Edge、TopoDS_Wire...）的最近距离，得到这个距离所对应的点【在TopoDS_Shape1上的和TopoDS_Shape2上的都可以得到】、最近距离的值、最近距离点的个数
GeomAPI_IntCS----求Geom_Curve和Geom_Surface的交点、交点，得到交点的个数和对应的交点、曲线段的条数、对应的曲线（Geom_Curve）
GeomAPI_IntSS----求Geom_Surface和Geom_Surface的交线，得到交线的条数和对应的交线
BRepAlgoAPI_Section---求TopoDS_Shape和TopoDS_Shape、Geom_Surface和TopoDS_Shape、TopoDS_Shape和gp_Pln相交后的数据，得到TopoDS_Shape【包含相交部分的数据，BRepAlgoAPI_Section继承于BRepBuilderAPI_MakeShape】

BRep_Tool---TopoDS_Face转Geom_Surface、TopoDS_Edge转Geom_Curve（转完后可以得到曲线U值范围）、TopoDS_Vertex转gp_Pnt
StlTransfer---TopoDS_Shape转StlMesh_Mesh
StlMesh_MeshExplorer---StlMesh_Mesh的遍历器、获得三角面片的三个顶点的x、y、z值

遍历示例：

 TopoDS_Shape TrimNurbsToSTL( const TopoDS_Face& aTrimTopFace,Standard_Real precision )
 {
     TopoDS_Face TopoFace = BRepBuilderAPI_MakeFace(aTrimTopFace).Face();
     Handle_StlMesh_Mesh aSTLMesh = new StlMesh_Mesh();
     StlTransfer::BuildIncrementalMesh(TopoFace, precision, Standard_False, aSTLMesh);
 
     Standard_Integer NumberDomains = aSTLMesh->NbDomains();
     Standard_Integer iND;
     gp_XYZ p1, p2, p3;
     TopoDS_Vertex Vertex1, Vertex2, Vertex3;
     TopoDS_Face AktFace;
     TopoDS_Wire AktWire;
     BRepBuilderAPI_Sewing aSewingTool;
     Standard_Real x1, y1, z1;
     Standard_Real x2, y2, z2;
     Standard_Real x3, y3, z3;
 
     aSewingTool.Init(CAD_NURBS_STL_TOLERANCE,Standard_True);
 
     TopoDS_Compound aComp;
     BRep_Builder BuildTool;
     BuildTool.MakeCompound( aComp );
 
     StlMesh_MeshExplorer aMExp (aSTLMesh);
 
     for (iND=1;iND<=NumberDomains;iND++) 
     {
         for (aMExp.InitTriangle (iND); aMExp.MoreTriangle (); aMExp.NextTriangle ()) 
         {
             aMExp.TriangleVertices (x1,y1,z1,x2,y2,z2,x3,y3,z3);
             p1.SetCoord(x1,y1,z1);
             p2.SetCoord(x2,y2,z2);
             p3.SetCoord(x3,y3,z3);
 
             if ((!(p1.IsEqual(p2,0.0))) && (!(p1.IsEqual(p3,0.0))))
             {
                 Vertex1 = BRepBuilderAPI_MakeVertex(p1);
                 Vertex2 = BRepBuilderAPI_MakeVertex(p2);
                 Vertex3 = BRepBuilderAPI_MakeVertex(p3);
 
                 AktWire = BRepBuilderAPI_MakePolygon( Vertex1, Vertex2, Vertex3, Standard_True);
 
                 if( !AktWire.IsNull())
                 {
                     AktFace = BRepBuilderAPI_MakeFace( AktWire);
                     if(!AktFace.IsNull())
                         BuildTool.Add( aComp, AktFace );
                 }
             }
         }
     }
     aSTLMesh->Clear();
 
     aSewingTool.Load( aComp );
     aSewingTool.Perform();
     TopoDS_Shape aShape = aSewingTool.SewedShape();
     if ( aShape.IsNull() )
         aShape = aComp;
 
     return aShape;
 
    
 }

StlMesh_Mesh---获得网格片数、网格面片中的三角面片个数

TopoDS_Shape---存储数据的拓扑结构

TopExp_Explorer---TopoDS_Shape的遍历器

遍历示例;

void example()
{
TopoDS_Shape aShape;
TopoDS_Face aFace;
TopoDS_Wire aWire;
TopoDS_Edge aEdge;
TopoDS_Vertex aVertex;
TopExp_Explorer Exp_Edge;
TopExp_Explorer Exp_Wire;
TopExp_Explorer Exp_Face;
TopExp_Explorer Exp_Vertex;
for (Exp_Face.Init(aShape,TopAbs_FACE);Exp_Face.More();Exp_Face.Next())
{
aFace = TopoDS::Face(Exp_Face.Current());
for (Exp_Wire.Init(aFace,TopAbs_WIRE);Exp_Wire.More();Exp_Wire.Next())
{
aWire = TopoDS::Wire(Exp_Wire.Current());
for (Exp_Edge.Init(aWire,TopAbs_EDGE);Exp_Edge.More();Exp_Edge.Next())
{
aEdge = TopoDS::Edge(Exp_Edge.Current());
for (Exp_Vertex.Init(aEdge,TopAbs_VERTEX);Exp_Vertex.More();Exp_Vertex.Next())
{
aVertex = TopoDS::Vertex(Exp_Vertex.Current());
gp_Pnt Pnt = BRep_Tool::Pnt(aVertex);
}
}
}
}
for (Exp_Vertex.Init(aShape,TopAbs_VERTEX);Exp_Vertex.More();Exp_Vertex.Next())
{
aVertex = TopoDS::Vertex(Exp_Vertex.Current());
gp_Pnt Pnt = BRep_Tool::Pnt(aVertex);
}
for (Exp_Edge.Init(aShape,TopAbs_EDGE);Exp_Edge.More();Exp_Edge.Next())
{
aEdge = TopoDS::Edge(Exp_Edge.Current());
Standard_Real First,Last;
Handle(Geom_Curve) Pnt = BRep_Tool::Curve(aEdge,First,Last);
}
for (Exp_Wire.Init(aShape,TopAbs_WIRE);Exp_Wire.More();Exp_Wire.Next())
{
aWire = TopoDS::Wire(Exp_Wire.Current());
}
for (Exp_Face.Init(aShape,TopAbs_WIRE);Exp_Face.More();Exp_Face.Next())
{

aFace = TopoDS::Face(Exp_Face.Current());
Handle(Geom_Surface) aSurface = BRep_Tool::Surface(aFace);
}
}

 

拓扑创建：

BRepBuilderAPI_MakeVertex = TopoDS_Vertex
BRepBuilderAPI_MakeEdge = TopoDS_Edge
BRepBuilderAPI_MakeWire = TopoDS_Wire
BRepBuilderAPI_MakeFace = TopoDS_Face
BRepBuilderAPI_MakePolygon = TopoDS_Wire //直线框

几何容器：数组队列

 

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版权声明：本文为CSDN博主「少莫千华」的原创文章，遵循CC 4.0 BY-SA版权协议，转载请附上原文出处链接及本声明。
原文链接：https://blog.csdn.net/chenlu5201314/article/details/8687364