/* ========================================================================= * * * * OpenMesh * * Copyright (c) 2001-2015, RWTH-Aachen University * * Department of Computer Graphics and Multimedia * * All rights reserved. * * www.openmesh.org * * * *---------------------------------------------------------------------------* * This file is part of OpenMesh. * *---------------------------------------------------------------------------* * * * Redistribution and use in source and binary forms, with or without * * modification, are permitted provided that the following conditions * * are met: * * * * 1. Redistributions of source code must retain the above copyright notice, * * this list of conditions and the following disclaimer. * * * * 2. Redistributions in binary form must reproduce the above copyright * * notice, this list of conditions and the following disclaimer in the * * documentation and/or other materials provided with the distribution. * * * * 3. Neither the name of the copyright holder nor the names of its * * contributors may be used to endorse or promote products derived from * * this software without specific prior written permission. * * * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS * * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED * * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A * * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER * * OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, * * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, * * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR * * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF * * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING * * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS * * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. * * * * ========================================================================= */ #include // -------------------- OpenMesh #include #include #include #include // ---------------------------------------------------------------------------- struct MyTraits : public OpenMesh::DefaultTraits { }; typedef OpenMesh::PolyMesh_ArrayKernelT MyMesh; // ---------------------------------------------------------------------------- // Build a simple cube and delete it except one face int main() { MyMesh mesh; // the request has to be called before a vertex/face/edge can be deleted. it grants access to the status attribute mesh.request_face_status(); mesh.request_edge_status(); mesh.request_vertex_status(); // generate vertices MyMesh::VertexHandle vhandle[8]; MyMesh::FaceHandle fhandle[6]; vhandle[0] = mesh.add_vertex(MyMesh::Point(-1, -1, 1)); vhandle[1] = mesh.add_vertex(MyMesh::Point( 1, -1, 1)); vhandle[2] = mesh.add_vertex(MyMesh::Point( 1, 1, 1)); vhandle[3] = mesh.add_vertex(MyMesh::Point(-1, 1, 1)); vhandle[4] = mesh.add_vertex(MyMesh::Point(-1, -1, -1)); vhandle[5] = mesh.add_vertex(MyMesh::Point( 1, -1, -1)); vhandle[6] = mesh.add_vertex(MyMesh::Point( 1, 1, -1)); vhandle[7] = mesh.add_vertex(MyMesh::Point(-1, 1, -1)); // generate (quadrilateral) faces std::vector tmp_face_vhandles; tmp_face_vhandles.clear(); tmp_face_vhandles.push_back(vhandle[0]); tmp_face_vhandles.push_back(vhandle[1]); tmp_face_vhandles.push_back(vhandle[2]); tmp_face_vhandles.push_back(vhandle[3]); fhandle[0] = mesh.add_face(tmp_face_vhandles); tmp_face_vhandles.clear(); tmp_face_vhandles.push_back(vhandle[7]); tmp_face_vhandles.push_back(vhandle[6]); tmp_face_vhandles.push_back(vhandle[5]); tmp_face_vhandles.push_back(vhandle[4]); fhandle[1] = mesh.add_face(tmp_face_vhandles); tmp_face_vhandles.clear(); tmp_face_vhandles.push_back(vhandle[1]); tmp_face_vhandles.push_back(vhandle[0]); tmp_face_vhandles.push_back(vhandle[4]); tmp_face_vhandles.push_back(vhandle[5]); fhandle[2] = mesh.add_face(tmp_face_vhandles); tmp_face_vhandles.clear(); tmp_face_vhandles.push_back(vhandle[2]); tmp_face_vhandles.push_back(vhandle[1]); tmp_face_vhandles.push_back(vhandle[5]); tmp_face_vhandles.push_back(vhandle[6]); fhandle[3] = mesh.add_face(tmp_face_vhandles); tmp_face_vhandles.clear(); tmp_face_vhandles.push_back(vhandle[3]); tmp_face_vhandles.push_back(vhandle[2]); tmp_face_vhandles.push_back(vhandle[6]); tmp_face_vhandles.push_back(vhandle[7]); fhandle[4] = mesh.add_face(tmp_face_vhandles); tmp_face_vhandles.clear(); tmp_face_vhandles.push_back(vhandle[0]); tmp_face_vhandles.push_back(vhandle[3]); tmp_face_vhandles.push_back(vhandle[7]); tmp_face_vhandles.push_back(vhandle[4]); fhandle[5] = mesh.add_face(tmp_face_vhandles); // And now delete all faces and vertices // except face (vh[7], vh[6], vh[5], vh[4]) // whose handle resides in fhandle[1] // Delete face 0 mesh.delete_face(fhandle[0], false); // ... face 2 mesh.delete_face(fhandle[2], false); // ... face 3 mesh.delete_face(fhandle[3], false); // ... face 4 mesh.delete_face(fhandle[4], false); // ... face 5 mesh.delete_face(fhandle[5], false); // If isolated vertices result in a face deletion // they have to be deleted manually. If you want this // to happen automatically, change the second parameter // to true. // Now delete the isolated vertices 0, 1, 2 and 3 mesh.delete_vertex(vhandle[0], false); mesh.delete_vertex(vhandle[1], false); mesh.delete_vertex(vhandle[2], false); mesh.delete_vertex(vhandle[3], false); // Delete all elements that are marked as deleted // from memory. mesh.garbage_collection(); // write mesh to output.obj try { if ( !OpenMesh::IO::write_mesh(mesh, "output.off") ) { std::cerr << "Cannot write mesh to file 'output.off'" << std::endl; return 1; } } catch( std::exception& x ) { std::cerr << x.what() << std::endl; return 1; } return 0; }