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OCC 拟合的平面转换为有界平面

article 2024/11/13 3:53:09

问题：针对导入的部分面无法获取大小，同时也无法判断点是否在面上。但是OBB可以获取大小

解决方法：通过面拟合转换gp_Pln，然后获取面的内外边，重新修剪生成新的TopoDS_Face

疑问：本人对OCC中各种面的特性不是很了解有知道的老大可以帮忙普及一下：

TopoDS_Face

BRepAdaptor_Surface

GeomAbs_Plane

Geom_Plane

GeomPlate_Surface

gp_Pln

以下是实现的参数部分代码，通过UV提取点，判断点是否在面上。

//如果获取的包容盒小于步距，获取一下OBB包容盒判断是否大于2，大于2开始面转换
if (aUmax - aUmin < uStep || aVmax - aVmin < vStep)
{
   Bnd_OBB obb;
   BRepBndLib::AddOBB(aFace, obb, Standard_True, Standard_False);
   if (2 * obb.XHSize() > 2 || 2 * obb.YHSize() > 2 || 2 * obb.ZHSize() > 2)
   {
       //判断面的类型转换面类型获取面的边界修建获取新的有界面针对平面
       if (aSurface.GetType() == GeomAbs_SurfaceOfRevolution || aSurface.GetType() == GeomAbs_BSplineSurface)//回旋曲面//样条曲面
       {
           TopLoc_Location theTopLoc_Location = aFace.Location();
           Handle(Geom_Surface) geomSurface = aSurface.Surface().Surface();
           Handle(Geom_BSplineSurface) bsplineSurface = GeomConvert::SurfaceToBSplineSurface(geomSurface);
           GeomConvert_SurfToAnaSurf converter(bsplineSurface);
           converter.SetConvType(GeomConvert_Simplest);
           converter.SetTarget(GeomAbs_Plane);
           geomSurface = converter.ConvertToAnalytical(1);
           gp_Pln thegp_Pln;
           if (converter.IsCanonical(geomSurface))
           {
               Standard_CString aRotatedEntityTypeName = geomSurface->DynamicType()->Name();
               if (geomSurface->IsKind(STANDARD_TYPE(Geom_Plane)))
               {
                   Handle(Geom_Plane) theGeom_Plane = Handle(Geom_Plane)::DownCast(geomSurface);
                   theGeom_Plane->Transform(theTopLoc_Location);
                   if (theGeom_Plane.IsNull())
                   {
                       return 0;
                   }
                   thegp_Pln = theGeom_Plane->Pln();
                   TopoDS_Wire outerWire = ShapeAnalysis::OuterWire(aFace);
                   std::vector<TopoDS_Wire> innerHoles;
                   // 遍历面上的每个边界线 (TopoDS_Wire)
                   for (TopExp_Explorer wireExp(aFace, TopAbs_WIRE); wireExp.More(); wireExp.Next()) {
                       TopoDS_Wire wire = TopoDS::Wire(wireExp.Current());
                       if (!wire.IsSame(outerWire))
                       {
                           innerHoles.push_back(wire); // 内孔
                       }
                   }
                   BRepBuilderAPI_MakeFace faceBuilder(thegp_Pln, outerWire);
                   // 添加内孔
                   for (const auto& holeWire : innerHoles) {
                       faceBuilder.Add(holeWire);
                   }
                   // 生成新的有限平面
                   aFace = faceBuilder.Face();
                   aSurface = BRepAdaptor_Surface(aFace);
                   aUmin = aSurface.FirstUParameter();
                   aUmax = aSurface.LastUParameter();
                   aVmin = aSurface.FirstVParameter();
                   aVmax = aSurface.LastVParameter();
               }
           }
       }