• <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(3956) 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。

            久久99国产精品99久久| 亚洲国产精品久久电影欧美| 精品精品国产自在久久高清| 东京热TOKYO综合久久精品| 国产精品久久永久免费| 欧美久久久久久午夜精品| 久久久久免费精品国产| 久久国产一区二区| 性做久久久久久免费观看| www性久久久com| 久久午夜夜伦鲁鲁片免费无码影视 | 四虎久久影院| 久久一日本道色综合久久| 精品国产热久久久福利| 久久99精品久久久久婷婷| 久久久久久精品久久久久| 99热成人精品免费久久| 久久精品人人做人人爽电影蜜月 | 久久天天躁狠狠躁夜夜av浪潮 | 品成人欧美大片久久国产欧美| 久久免费看黄a级毛片| 热re99久久精品国产99热| 久久亚洲AV成人出白浆无码国产 | 99久久国产热无码精品免费 | 久久久女人与动物群交毛片 | 久久久久久精品成人免费图片| 国产成人99久久亚洲综合精品| 久久久精品国产sm调教网站| 久久99久久99精品免视看动漫| 久久精品免费大片国产大片| 色综合合久久天天综合绕视看| 97久久国产亚洲精品超碰热| 无码AV中文字幕久久专区| 精品国产乱码久久久久久人妻| 99久久免费国产精品特黄| 人妻少妇精品久久| 久久成人18免费网站| 久久99国产一区二区三区| 一本大道加勒比久久综合| 国产精品九九久久免费视频 | 亚洲国产婷婷香蕉久久久久久|