• <ins id="pjuwb"></ins>
    <blockquote id="pjuwb"><pre id="pjuwb"></pre></blockquote>
    <noscript id="pjuwb"></noscript>
          <sup id="pjuwb"><pre id="pjuwb"></pre></sup>
            <dd id="pjuwb"></dd>
            <abbr id="pjuwb"></abbr>

            eryar

            PipeCAD - Plant Piping Design Software.
            RvmTranslator - Translate AVEVA RVM to OBJ, glTF, etc.
            posts - 603, comments - 590, trackbacks - 0, articles - 0

            Split Shape by Plane in OpenCASCADE

            Posted on 2017-07-01 12:21 eryar 閱讀(3997) 評論(0)  編輯 收藏 引用 所屬分類: 2.OpenCASCADE

            Split Shape by Plane in OpenCASCADE

            eryar@163.com

            Abstract. Sometimes you want to split a shape by plane or even split a shape by a B Spline surface, OpenCASCADE provide a feature class BRepFeat_SplitShape to implement the function. The paper give a sample code to split a cylinder by plane.

            Key Words. Split Shape, BRep Feature Algorithms.

            1. Introduction

            OpenCASCADE提供了Boolean Operation實現了任意兩個形狀的交、并、差的布爾操作。但是如何實現用一個面將一個形狀切割成兩半呢?其實Boolean Operation中已經有求交分割的算法,但是沒有直接提供一個分割的功能類,而是在BRepFeat_SplitShape提供了分割功能。

            wps69BE.tmp

            Figure 1. Split Cylinder by Plane

            2. Code Demo

            使用類BRepAlgoAPI_Section和類BRepFeat_SplitShape相結合來實現分割Split形狀的功能。完整代碼示例如下:

            /*
            Copyright(C) 2017 Shing Liu(eryar@163.com)

            Permission is hereby granted, free of charge, to any person obtaining a copy
            of this software and associated documentation files(the "Software"), to deal
            in the Software without restriction, including without limitation the rights
            to use, copy, modify, merge, publish, distribute, sublicense, and / or sell
            copies of the Software, and to permit persons to whom the Software is
            furnished to do so, subject to the following conditions :

            The above copyright notice and this permission notice shall be included in all
            copies or substantial portions of the Software.

            THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
            IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
            FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.IN NO EVENT SHALL THE
            AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
            LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
            OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
            SOFTWARE.
            */

            // Visual Studio 2013 & OpenCASCADE7.1.0

            #include <gp_Pln.hxx>

            #include <TopoDS.hxx>

            #include <TopExp.hxx>
            #include <TopExp_Explorer.hxx>

            #include <BRepTools.hxx>

            #include <BRepPrimAPI_MakeCylinder.hxx>

            #include <BRepAlgoAPI_Section.hxx>

            #include <BRepFeat_SplitShape.hxx>

            #pragma comment(lib, "TKernel.lib")
            #pragma comment(lib, "TKMath.lib")

            #pragma comment(lib, "TKG2d.lib")
            #pragma comment(lib, "TKG3d.lib")
            #pragma comment(lib, "TKGeomBase.lib")
            #pragma comment(lib, "TKGeomAlgo.lib")

            #pragma comment(lib, "TKBRep.lib")
            #pragma comment(lib, "TKTopAlgo.lib")

            #pragma comment(lib, "TKBO.lib")
            #pragma comment(lib, "TKPrim.lib")
            #pragma comment(lib, "TKFeat.lib")

            //! Test split a cylinder by plane.
            //! You can use the algorithm to split other shapes.
            void testSplit()
            {
                BRepPrimAPI_MakeCylinder aCylinderMaker(10.0, 20.0);
                TopoDS_Shape aCylinder = aCylinderMaker.Shape();

                // Build section by the split plane for the cylinder.
                BRepAlgoAPI_Section aSection(aCylinder, gp_Pln(gp_Pnt(0.0, 0.0, 15.0), gp::DZ()), Standard_False);
                aSection.ComputePCurveOn1(Standard_True);
                aSection.Approximation(Standard_True);
                aSection.Build();

                // Split the cylinder shape.
                BRepFeat_SplitShape aShapeSpliter(aCylinder);

                for (TopExp_Explorer i(aSection.Shape(), TopAbs_EDGE); i.More(); i.Next())
                {
                    TopoDS_Shape anEdge = i.Current();
                    TopoDS_Shape aFace;

                    if (aSection.HasAncestorFaceOn1(anEdge, aFace))
                    {
                        TopoDS_Edge E = TopoDS::Edge(anEdge);
                        TopoDS_Face F = TopoDS::Face(aFace);

                        aShapeSpliter.Add(E, F);
                    }
                }

                aShapeSpliter.Build();

                // Rebuild left and right shape.
                BRep_Builder aBuilder;
                TopoDS_Compound aLeftCompound;
                TopoDS_Compound aRightCompound;

                aBuilder.MakeCompound(aLeftCompound);
                aBuilder.MakeCompound(aRightCompound);

                // Left shape.
                TopTools_MapOfShape aLeftShapeMap;
                const TopTools_ListOfShape& aLeftShapes = aShapeSpliter.Left();
                for (auto i = aLeftShapes.cbegin(); i != aLeftShapes.cend(); i++)
                {
                    aLeftShapeMap.Add(*i);

                    aBuilder.Add(aLeftCompound, *i);
                }

                // Right shape.
                TopTools_IndexedMapOfShape aShapeMap;
                TopExp::MapShapes(aShapeSpliter.Shape(), TopAbs_FACE, aShapeMap);

                for (auto i = aShapeMap.cbegin(); i != aShapeMap.cend(); i++)
                {
                    if (!aLeftShapeMap.Contains(*i))
                    {
                        aBuilder.Add(aRightCompound, *i);
                    }
                }

                // Output left and right shape.
                BRepTools::Write(aLeftCompound, "d:/left.brep");
                BRepTools::Write(aRightCompound, "d:/right.brep");
            }

            int main(int argc, char* argv[])
            {
                testSplit();

                return 0;
            }

            先創建一個圓柱體,再使用類BRepAlgoAPI_Section將圓柱體用平面進行分割,最后使用類BRepFeat_SplitShape進行分類,得到切割后的形狀及Left()形狀,把切割后形狀中的Left過濾后剩下就是切割另一半的形狀;最后導出被平面切割后得到的兩半形狀。結果用動畫演示如下:

            split shape

            Figure 2. Split Shape animation demo

            3. Conclusion

            OpenCASCADE提供類BRepFeat_SplitShape來實現對一個形狀進行切割的功能,但是要配合BRepAlgoAPI_Section使用。因為Boolean Operation中已經實現了求交、分類的功能,所以在最新版本的源碼7.2.0中已經將分割功能集成到了Boolean Operation中。分割后如果沒有被改變的面還是原來的面。

            99久久国产综合精品女同图片| 无码AV波多野结衣久久| 国产精品成人无码久久久久久 | 婷婷久久综合九色综合绿巨人| 老男人久久青草av高清| 狠狠色丁香久久婷婷综合五月 | 亚洲精品无码专区久久久| 97久久精品人妻人人搡人人玩| 精品久久久久久无码国产| 久久综合亚洲色HEZYO社区| 国产精品久久国产精麻豆99网站| 久久久久综合中文字幕| 亚洲AV日韩精品久久久久久| 国产女人aaa级久久久级| 精品国产乱码久久久久久人妻| 国产成人综合久久久久久| 日本欧美久久久久免费播放网| 久久噜噜久久久精品66| 99国产欧美久久久精品蜜芽| 亚洲伊人久久大香线蕉综合图片| 欧美日韩成人精品久久久免费看| 国产精品毛片久久久久久久| 亚洲综合日韩久久成人AV| 久久99精品久久久久久秒播| 久久久久久久久无码精品亚洲日韩| 精品久久久一二三区| 久久精品国产亚洲av瑜伽| 久久国产精品久久| 久久国产欧美日韩精品| 午夜精品久久久久久中宇| 亚洲级αV无码毛片久久精品| 色综合合久久天天给综看| 国产精品亚洲美女久久久| 国产精品久久久久久影院| 国产精品久久久久国产A级| 久久亚洲精品人成综合网| 久久久久99精品成人片试看| 久久久久女人精品毛片| 99久久99久久久精品齐齐| 久久精品国产99国产精偷| 亚洲一本综合久久|