• <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(píng)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(shí)現(xiàn)了任意兩個(gè)形狀的交、并、差的布爾操作。但是如何實(shí)現(xiàn)用一個(gè)面將一個(gè)形狀切割成兩半呢?其實(shí)Boolean Operation中已經(jīng)有求交分割的算法,但是沒有直接提供一個(gè)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(jié)合來實(shí)現(xiàn)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(chuàng)建一個(gè)圓柱體,再使用類BRepAlgoAPI_Section將圓柱體用平面進(jìn)行分割,最后使用類BRepFeat_SplitShape進(jìn)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(dǎo)出被平面切割后得到的兩半形狀。結(jié)果用動(dòng)畫演示如下:

            split shape

            Figure 2. Split Shape animation demo

            3. Conclusion

            OpenCASCADE提供類BRepFeat_SplitShape來實(shí)現(xiàn)對(duì)一個(gè)形狀進(jìn)行切割的功能,但是要配合BRepAlgoAPI_Section使用。因?yàn)锽oolean Operation中已經(jīng)實(shí)現(xiàn)了求交、分類的功能,所以在最新版本的源碼7.2.0中已經(jīng)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。

            久久人人爽人人爽人人片AV高清| 久久强奷乱码老熟女| 国产精品热久久无码av| 国产精品久久自在自线观看| 久久成人国产精品| 香蕉久久夜色精品国产小说| 久久综合视频网站| 亚洲欧美日韩精品久久亚洲区| 色欲久久久天天天综合网| 久久AAAA片一区二区| 亚洲精品无码久久久久去q| 性做久久久久久久| 国产精品亚洲综合专区片高清久久久 | 久久精品卫校国产小美女| 99久久综合国产精品免费| 久久精品成人免费看| 无码国产69精品久久久久网站| 久久大香香蕉国产| 女人高潮久久久叫人喷水| 久久综合综合久久狠狠狠97色88| 人妻无码αv中文字幕久久琪琪布| 狠狠色婷婷久久一区二区| 久久综合偷偷噜噜噜色| 99久久99久久精品免费看蜜桃| 久久99久久无码毛片一区二区| 中文字幕人妻色偷偷久久| 久久久久亚洲AV无码专区网站| 无码人妻久久一区二区三区| 国产真实乱对白精彩久久| 色婷婷综合久久久中文字幕| 亚洲欧美一级久久精品| 国产精品九九久久精品女同亚洲欧美日韩综合区| 日韩久久无码免费毛片软件| 国产精品狼人久久久久影院| 国内精品九九久久久精品| 精品国产乱码久久久久久1区2区 | 99麻豆久久久国产精品免费| 狠狠色狠狠色综合久久| 色99久久久久高潮综合影院| 久久精品视屏| 久久亚洲精品视频|