- OpenMesh - lists.rwth-aachen.de

Python - Bulk Add Points
by Jesse Vander Does 31 Oct '19

31 Oct '19

Hello OpenMesh, I would like to be able to quickly copy a numpy array of vertices and faces into a TriMesh. After some digging I found this task https://www.graphics.rwth-aachen.de:9000/OpenMesh/openmesh-python/issues/18 which suggests assigning multiple points by doing `m.points()[:] = p`. I can't, however, figure out how to resize the points array without using `add_point` or `new_vertex`. Any help would be much appreciated. As an aside, it would be great to be able to post and comment on issues. Is there a reason the project is managed such that gitlab project is readonly? Best regards, -- Jesse Vander Does 424-465-0285 | jvanderdoes(a)gmail.com

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Question regarding OpenVolume Mesh
by S Vijai Kumar 29 Aug '19

29 Aug '19

Hello there, I am not sure if this is the place to ask questions about Open Volume Mesh. But i couldn't find any other mailing list. Hence i am posting here. I am trying to create a mesh of type OpenVolumeMesh::GeometricTetrahedralMeshV3d HalfFaceMesh; To this, i am adding tetrahedrons as follows OpenVolumeMesh::CellPropertyT< unsigned int > TetSphereAssociativeProperty = HalfFaceMesh.request_cell_property< unsigned int >("TET_SPHERE_ASSOCIATION_ID"); int num_vol_elements = nglib::Ng_GetNE(CurrentMesh); unsigned int tetra_cnt = 1; for(unsigned int tetra = 0; tetra < num_vol_elements; ++tetra) { int CoordinateArray[4]; nglib::Ng_GetVolumeElement(CurrentMesh, tetra + 1, CoordinateArray); long v1 = CoordinateArray[0]; long v2 = CoordinateArray[1]; long v3 = CoordinateArray[2]; long v4 = CoordinateArray[3]; VertexHandle _v1 = HalfFaceMesh.add_vertex(meshPointToVector3D(v1)); VertexHandle _v2 = HalfFaceMesh.add_vertex(meshPointToVector3D(v2)); VertexHandle _v3 = HalfFaceMesh.add_vertex(meshPointToVector3D(v3)); VertexHandle _v4 = HalfFaceMesh.add_vertex(meshPointToVector3D(v4)); CellHandle current_cell = HalfFaceMesh.add_cell(_v1, _v2, _v3, _v4); TetSphereAssociativeProperty[current_cell] = tetra_cnt; ++tetra_cnt; } The issue is when i try to get neighbors of a particular tetrahedron, i run into issues. I have tried CellCellIterator and it gives me nothing. So i wrote the code to do it in the most naive way possible also (i know its quadratic). std::set< CellHandle > getUniqueNeighbouringTetsForGivenTets(CellHandle input_tetrahedron) { std::set< CellHandle > matching_cells; std::set< FaceHandle > matching_faces = getFacesForGivenCell(input_tetrahedron); HalfFaceMesh.enable_bottom_up_incidences(true); for(auto mf_iter = matching_faces.begin(); mf_iter != matching_faces.end(); ++mf_iter) { for(CellIterator c_it = HalfFaceMesh.cells_begin(); c_it != HalfFaceMesh.cells_end(); ++c_it) { if(*c_it != input_tetrahedron) { std::set< FaceHandle > intermediate_matching_faces = getFacesForGivenCell(*c_it); for(auto mff_iter = intermediate_matching_faces.begin(); mff_iter != intermediate_matching_faces.end(); ++mff_iter) { if(*mff_iter == *mf_iter) { matching_cells.emplace(*c_it); } } } } } return matching_cells; } I still do not get any neighbours at all. It almost seems like the neighbors are not associated automatically and basically one of the half faces of every face is just some garbage with an id -1. Should i manually establish the half face connectivity between adjacent cells while building a mesh in open volume mesh ? This was not the case in OpenMesh where we simply add polygons and edges are automatically split into half edges. I am stuck and any help would be appreciated. Thanks in advance. Kind regards, S Vijai Kumar Sent with [ProtonMail](https://protonmail.com) Secure Email.

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OpenVolumeMesh?
by regnstrom 21 Aug '19

21 Aug '19

Hello! Is this also the place for questions about OpenVolumeMesh? Regards, Björn Regnström

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Mesh parametrization
by Jordi Torres 14 Aug '19

14 Aug '19

Hi all, Is there any feature related to mesh parametrization in OpenMesh? I'm thinking in conformal mapping, distortion analysis or most isometric parametrization, related to texture coordinates generation. Thanks in advance! -- Jordi Torres

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Re: join/combine two meshes
by Jan Möbius 24 Jul '19

24 Jul '19

Hi, there is no integrated function to join two Meshes. However in OpenFlipper there is a plugin which joins two meshes. So you might want to get the code from the merge plugin in OpenFlipper. Best, Jan Möbius On 07.06.19 22:37, Matthew Buchanan wrote: > Hi, > > > > I was browsing the mailing list archive for other questions like this, > but I found no results with an answer. > > I am trying to write a program that adds together multiple OFF meshes > into one, but there doesn’t seem to be a function or operation that does > this. > > Is there a reliable way to combine two or more meshes into one using > OpenMesh? > > > > -Matt > > > _______________________________________________ > OpenMesh mailing list -- openmesh(a)lists.rwth-aachen.de > To unsubscribe send an email to openmesh-leave(a)lists.rwth-aachen.de > https://lists.rwth-aachen.de/postorius/lists/openmesh.lists.rwth-aachen.de > -- Jan Möbius Department of Computer Science VIII Aachen University of Technology (RWTH) Ahornstrasse 55, 52074 Aachen, Germany Phone ++49 (0)241 80-21802 Fax ++49 (0)241 80-22899 mailto:moebius@cs.rwth-aachen.de http://www.rwth-graphics.de

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Non-manifold meshes
by cDc Seacave 24 Jul '19

24 Jul '19

Hi, I am developing a photorgrammetry library OpenMVS <https://github.com/cdcseacave/openMVS> and I am looking at your library to repair the generated meshes. OpenMesh seems to have support for mesh decimation, smoothing, hole filling, but I searched all documentation and code and I didn't find if it is able to repair non-manifold meshes. Is OpenMesh able to import a non-manifold mesh and convert it to manifold mesh with as little deformation as possible (for example not simply removing all faces to a non-manifold vertex, but try to repair the surface at that point)? Thank you, Dan

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Nonmanifold geometries.
by Carlo Peruzzo 22 Jul '19

22 Jul '19

Dear Open mesh developers, In the introduction to OpenMesh in the following website: https://www.openmesh.org/intro/ reference is made to the paper: Botsch, Mario; S. Steinberg; S. Bischoff; L. Kobbelt: OpenMesh - a generic and efficient polygon mesh data structure, 1st OpenSG Symposium, 2002. <http://www.graphics.rwth-aachen.de/media/papers/openmesh1.pdf> In this article it is reported that: /Our current OpenMesh implementation can handle complex vertices, but does at the moment not support complex edges. (Complex edges are characterized by belonging to more than two faces.)/ I need to make meshes like the one on the right in the figure below. For example: more than two faces have the same side in common. Since the article mentioned dates back to 2002, I wanted to ask you if OpenMesh can now handle these type of meshes. undefined I also read what is reported in the OpenVolumeMesh project and found that this tool allows you to manage meshes composed of volume elements and somehow generalizes Openmesh, allowing you to represent more complex geometries. In my work, I don't have to manage volumes but I have to manage surfaces that have branches (in particular I model fractures in the materials). Thanks in advance. Best regards, Carlo Peruzzo -- Carlo Peruzzo, Doctoral Assistant École Polytechnique Fédérale de Lausanne (EPFL), Switzerland +41 21 69 37647 EPFL-ENAC-IIC-GEL GC B1 385 (Bâtiment GC) Station 18 Lausanne CH 1015 http://gel.epfl.ch

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join/combine two meshes
by Matthew Buchanan 07 Jun '19

07 Jun '19

Hi, I was browsing the mailing list archive for other questions like this, but I found no results with an answer. I am trying to write a program that adds together multiple OFF meshes into one, but there doesn’t seem to be a function or operation that does this. Is there a reliable way to combine two or more meshes into one using OpenMesh? -Matt

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Questions about Using OpenMesh in Mac OS X
by 梓欣张 29 May '19

29 May '19

Hi, I’m a beginner in OpenMesh so this question may seem to be funny. I’ve successfully installed OpenMesh using homebrew. But when I tried to run a simple testing program in CLion, things went wrong. Messages are like this: /Applications/CLion.app/Contents/bin/cmake/bin/cmake --build /Users/felix/Desktop/Learning/FillHole/FillHole/cmake-build-debug --target FillHole -- -j 4 Scanning dependencies of target FillHole [ 50%] Building CXX object CMakeFiles/FillHole.dir/main.cpp.o [100%] Linking CXX executable FillHole Undefined symbols for architecture x86_64: "OpenMesh::PolyConnectivity::add_face(std::vector<OpenMesh::VertexHandle, std::allocator<OpenMesh::VertexHandle> > const&)", referenced from: _main in main.cpp.o "OpenMesh::IO::_IOManager_::write(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, OpenMesh::IO::BaseExporter&, OpenMesh::IO::Options, long)", referenced from: bool OpenMesh::IO::write_mesh<OpenMesh::PolyMesh_ArrayKernelT<OpenMesh::DefaultTraits> >(OpenMesh::PolyMesh_ArrayKernelT<OpenMesh::DefaultTraits> const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, OpenMesh::IO::Options, long) in main.cpp.o "OpenMesh::BaseProperty::stats(std::basic_ostream<char, std::char_traits<char> >&) const", referenced from: vtable for OpenMesh::PropertyT<OpenMesh::DefaultTraits::EdgeT<OpenMesh::FinalMeshItemsT<OpenMesh::DefaultTraits, false>::ITraits, OpenMesh::FinalMeshItemsT<OpenMesh::DefaultTraits, false>::Refs> > in main.cpp.o vtable for OpenMesh::PropertyT<OpenMesh::DefaultTraits::HalfedgeT<OpenMesh::FinalMeshItemsT<OpenMesh::DefaultTraits, false>::ITraits, OpenMesh::FinalMeshItemsT<OpenMesh::DefaultTraits, false>::Refs> > in main.cpp.o vtable for OpenMesh::PropertyT<OpenMesh::DefaultTraits::FaceT<OpenMesh::FinalMeshItemsT<OpenMesh::DefaultTraits, false>::ITraits, OpenMesh::FinalMeshItemsT<OpenMesh::DefaultTraits, false>::Refs> > in main.cpp.o vtable for OpenMesh::PropertyT<OpenMesh::DefaultTraits::VertexT<OpenMesh::FinalMeshItemsT<OpenMesh::DefaultTraits, false>::ITraits, OpenMesh::FinalMeshItemsT<OpenMesh::DefaultTraits, false>::Refs> > in main.cpp.o vtable for OpenMesh::PropertyT<OpenMesh::VectorT<float, 3> > in main.cpp.o ld: symbol(s) not found for architecture x86_64 collect2: error: ld returned 1 exit status make[3]: *** [FillHole] Error 1 make[2]: *** [CMakeFiles/FillHole.dir/all] Error 2 make[1]: *** [CMakeFiles/FillHole.dir/rule] Error 2 make: *** [FillHole] Error 2 I think I’ve written my CMakeLists.txt correctly, so how can this happen? Here is my CMakeLists.txt: cmake_minimum_required(VERSION 3.9) project(FillHole) set(CMAKE_CXX_STANDARD 11) set(OpenMesh_FILE /usr/local/Cellar/open-mesh/7.1) INCLUDE_DIRECTORIES(${OpenMesh_FILE}/include) link_directories(${OpenMesh_FILE}/lib) add_executable(FillHole main.cpp) target_link_libraries(FillHole libOpenMeshCore.7.1.dylib libOpenMeshTools.7.1.dylib) And here is my program: #include <iostream> // -------------------- OpenMesh #include<unistd.h> #include <OpenMesh/Core/IO/MeshIO.hh> #include <OpenMesh/Core/Mesh/PolyMesh_ArrayKernelT.hh> // ---------------------------------------------------------------------------- typedef OpenMesh::PolyMesh_ArrayKernelT<> MyMesh; // ---------------------------------------------------------------------------- // Build a simple cube and write it to std::cout int main() { MyMesh mesh; // generate vertices MyMesh::VertexHandle vhandle[8]; 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<MyMesh::VertexHandle> face_vhandles; face_vhandles.clear(); face_vhandles.push_back(vhandle[0]); face_vhandles.push_back(vhandle[1]); face_vhandles.push_back(vhandle[2]); face_vhandles.push_back(vhandle[3]); mesh.add_face(face_vhandles); face_vhandles.clear(); face_vhandles.push_back(vhandle[7]); face_vhandles.push_back(vhandle[6]); face_vhandles.push_back(vhandle[5]); face_vhandles.push_back(vhandle[4]); mesh.add_face(face_vhandles); face_vhandles.clear(); face_vhandles.push_back(vhandle[1]); face_vhandles.push_back(vhandle[0]); face_vhandles.push_back(vhandle[4]); face_vhandles.push_back(vhandle[5]); mesh.add_face(face_vhandles); face_vhandles.clear(); face_vhandles.push_back(vhandle[2]); face_vhandles.push_back(vhandle[1]); face_vhandles.push_back(vhandle[5]); face_vhandles.push_back(vhandle[6]); mesh.add_face(face_vhandles); face_vhandles.clear(); face_vhandles.push_back(vhandle[3]); face_vhandles.push_back(vhandle[2]); face_vhandles.push_back(vhandle[6]); face_vhandles.push_back(vhandle[7]); mesh.add_face(face_vhandles); face_vhandles.clear(); face_vhandles.push_back(vhandle[0]); face_vhandles.push_back(vhandle[3]); face_vhandles.push_back(vhandle[7]); face_vhandles.push_back(vhandle[4]); mesh.add_face(face_vhandles); OpenMesh::IO::write_mesh(mesh, "output.off"); // 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; } std::cout << "nice"<<std::endl; return 0; } Can you help me find where the problem is? Thank you very much!

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Regarding the compilation and Execution of openmesh c++ program
by VALLIVEDU VAMSIKRISHNA 28 May '19

28 May '19

HI There, Good to have a Openmesh library ,Its helping a lot . But I have encountered with a problem where I am unable to execute the openmesh c++ program.I have installed the openmesh from the source . I am getting the errors when I am trying to run the sample building cube problem in openmesh .I have run it with command (g++ -o out cube.cc).I have encountered the errors which was given in the attachment. Please provide me how can i run the sample program and also how can i integrate the openmesh with the cgal c++ library. Thanks in advance. Thanks and Regards V.Vamsikrishna student

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