- OpenMesh - lists.rwth-aachen.de

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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OpenMesh 8.0 : Issue saving OBJ with multiple textures
by Jan-Michael Tressler 17 May '19

17 May '19

I have an OBJ mesh with multiple texture image materials with face texture coordinates. The input OBJ file correctly separates each texture by placing "usemtl material0000" in the face declarations ('f ...'). I have a typdef that defines my mesh class: `typedef OpenMesh::TriMesh_ArrayKernelT<> Mesh;` To open the OBJ file, I set `mesh.request_halfedge_texcoords2D()`. I have verified texture coordinates are correct. I'm trying to save the mesh (no modifications), but cannot get the OBJ output to have the correct texture material lines written to the file. Specifically, the face indices should be separated by 'usemtl matXX' for each different material. I've tried enabling and disabling face colors in my loading function. With face colors enabled, I only get the 1st material. All other materials are missing. When I disable face colors, but have FaceTexCoord enabled, line 330 of OBJWrite.cc ignores the line to write the 'usemtl mat' line. Is this a bug, or am I missing something? Thanks in advance, Jan-Michael Reading code: * OpenMesh::IO::Options ropt;* * ropt += OpenMesh::IO::Options::FaceTexCoord;* * ropt += OpenMesh::IO::Options::FaceColor;* * _mesh.request_vertex_normals();* * _mesh.request_face_normals();* * _mesh.request_halfedge_texcoords2D();* * _mesh.request_face_colors();* * if (!OpenMesh::IO::read_mesh(_mesh, path, ropt))* * {* * return false;* * }* Writing code: * OpenMesh::IO::Options wopt;* * if (_mesh.has_vertex_normals())* * wopt += OpenMesh::IO::Options::VertexNormal;* * //update textures* * if (_mesh.has_halfedge_texcoords2D())* * {* * wopt += OpenMesh::IO::Options::FaceTexCoord;* * wopt += OpenMesh::IO::Options::FaceColor;* * }* * return OpenMesh::IO::write_mesh(_mesh, path, wopt);*

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Warning when calculating normals of trimesh with default traits
by Martin Schultz 17 May '19

17 May '19

Hi, When I use a trimesh with default traits ( OpenMesh::TriMesh_ArrayKernelT<> mesh; ) the default scalar type that is used is float. So after adding some vertices and indices, when I call mesh.update_normals(); a compiler warning is generated, because 0.0 is interpreted as double in line 407 in PolyMeshT_impl.hh changing it to vectorize(_n, Scalar(0.0)); avoids this warning. The same probably also applies for other functions in PolyMeshT_impl.hh that use vectorize Best Regards! Martin -- Martin Schultz Developer - Integration ModuleWorks GmbH Henricistr. 50 52072 Aachen Germany martins(a)moduleworks.com<mailto:martins@moduleworks.com> https://www.moduleworks.com HRB 11871 Amtsgericht Aachen Geschäftsführer Yavuz Murtezaoglu

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What's the algorithm for adding a new face to a mesh?
by Luca Gagliano 27 Apr '19

27 Apr '19

Hi, I was wondering if you can explain exactly how the `add_face` function in the poly connectivity class works. I've been trying to understand how it works by reading the code, but I can't figure all the corner cases. I've also posted a question here ( https://computergraphics.stackexchange.com/questions/8771/halfedge-data-str…) which also points the specific bit I don't understand. Can you help? Thank you so much.

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Trouble Building VS 2017 Project
by Robert 18 Apr '19

18 Apr '19

Hello! I am trying to make use of OpenMesh inside of a Visual Studio 2017 project, but I am running into compile errors that arise from trying to include files from OpenMesh. Here are a couple images illustrating this: Includes: Errors: For context, I downloaded the OpenMesh (7.1) binary for Windows. I thought that all I would need to do is set values in the project settings to point to the lib, headers, and dlls. Thanks, Robert

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OpenMesh-Python face definition bug?
by Marc Siggel 17 Apr '19

17 Apr '19

Hi, I am new to OpenMesha and currently working with the python bindings to build a quick prototype of my code before moving to c++. attached a simple icosahedron structure. I defined 12 vertices and 20 faces. When using the vf circulator I experience that not all neighbouring face of a vertex are found. I also found that the number of faces is sensitive to the order of the vertex handles when defining a face. when looking at the indices some are set to -1. Is this expected behavior or am I missing something fundamental? Please find the minimal example below. Any help or comments would be greatly appreciated! Best regards, Marc Siggel import OpenMesh as om import numpy as np mesh = om.TriMesh() mesh_notebook = {} face_notebook = {} radius = 3.0/4.0/np.pi phi = 0.5*(1+np.sqrt(5)) a = radius / np.sqrt(phi*np.sqrt(5)) mesh_notebook[0,"handle"] = mesh.add_vertex([a*phi,0,a]) mesh_notebook[1,"handle"] = mesh.add_vertex([a*phi,0,-a]) mesh_notebook[2,"handle"] = mesh.add_vertex([-a*phi,0,-a]) mesh_notebook[3,"handle"] = mesh.add_vertex([-a*phi,0,a]) mesh_notebook[4,"handle"] = mesh.add_vertex([a,a*phi,0]) mesh_notebook[5,"handle"] = mesh.add_vertex([-a,a*phi,0]) mesh_notebook[6,"handle"] = mesh.add_vertex([-a,-a*phi,0]) mesh_notebook[7,"handle"] = mesh.add_vertex([a,-a*phi,0]) mesh_notebook[8,"handle"] = mesh.add_vertex([0,a,a*phi]) mesh_notebook[9,"handle"] = mesh.add_vertex([0,-a,a*phi]) mesh_notebook[10,"handle"] = mesh.add_vertex([0,-a,-a*phi]) mesh_notebook[11,"handle"] = mesh.add_vertex([0,a,-a*phi]) face_notebook[0,"handle"] = mesh.add_face(mesh_notebook[7,"handle"], mesh_notebook[0,"handle"], mesh_notebook[9,"handle"]) face_notebook[1,"handle"] = mesh.add_face(mesh_notebook[9,"handle"], mesh_notebook[7,"handle"], mesh_notebook[6,"handle"]) face_notebook[2,"handle"] = mesh.add_face(mesh_notebook[9,"handle"], mesh_notebook[6,"handle"], mesh_notebook[3,"handle"]) face_notebook[3,"handle"] = mesh.add_face(mesh_notebook[7,"handle"], mesh_notebook[1,"handle"], mesh_notebook[10,"handle"]) face_notebook[4,"handle"] = mesh.add_face(mesh_notebook[7,"handle"], mesh_notebook[10,"handle"], mesh_notebook[6,"handle"]) face_notebook[5,"handle"] = mesh.add_face(mesh_notebook[10,"handle"], mesh_notebook[6,"handle"], mesh_notebook[2,"handle"]) face_notebook[6,"handle"] = mesh.add_face(mesh_notebook[0,"handle"], mesh_notebook[1,"handle"], mesh_notebook[7,"handle"]) face_notebook[7,"handle"] = mesh.add_face(mesh_notebook[6,"handle"], mesh_notebook[3,"handle"], mesh_notebook[2,"handle"]) face_notebook[8,"handle"] = mesh.add_face(mesh_notebook[0,"handle"], mesh_notebook[4,"handle"], mesh_notebook[8,"handle"]) face_notebook[9,"handle"] = mesh.add_face(mesh_notebook[8,"handle"], mesh_notebook[4,"handle"], mesh_notebook[5,"handle"]) face_notebook[10,"handle"] = mesh.add_face(mesh_notebook[8,"handle"], mesh_notebook[3,"handle"], mesh_notebook[5,"handle"]) face_notebook[11,"handle"] = mesh.add_face(mesh_notebook[1,"handle"], mesh_notebook[4,"handle"], mesh_notebook[11,"handle"]) face_notebook[12,"handle"] = mesh.add_face(mesh_notebook[4,"handle"], mesh_notebook[5,"handle"], mesh_notebook[11,"handle"]) face_notebook[13,"handle"] = mesh.add_face(mesh_notebook[5,"handle"], mesh_notebook[11,"handle"], mesh_notebook[2,"handle"]) face_notebook[14,"handle"] = mesh.add_face(mesh_notebook[0,"handle"], mesh_notebook[1,"handle"], mesh_notebook[4,"handle"]) face_notebook[15,"handle"] = mesh.add_face(mesh_notebook[3,"handle"], mesh_notebook[2,"handle"], mesh_notebook[5,"handle"]) face_notebook[16,"handle"] = mesh.add_face(mesh_notebook[0,"handle"], mesh_notebook[8,"handle"], mesh_notebook[9,"handle"]) face_notebook[17,"handle"] = mesh.add_face(mesh_notebook[9,"handle"], mesh_notebook[8,"handle"], mesh_notebook[3,"handle"]) face_notebook[18,"handle"] = mesh.add_face(mesh_notebook[1,"handle"], mesh_notebook[10,"handle"], mesh_notebook[11,"handle"]) face_notebook[19,"handle"] = mesh.add_face(mesh_notebook[2,"handle"], mesh_notebook[10,"handle"], mesh_notebook[11,"handle"]) print(len(mesh.faces())) # should be 20 for edge in mesh.vf(mesh_notebook[0,"handle"]): print(edge.idx()) # should be 5 for j,i in face_notebook: print(face_notebook[j,i].idx()) # some are defined as -1 - default behavior?

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Fwd: delete_vertex issue
by Alex Syniakov 09 Apr '19

09 Apr '19

---------- Forwarded message --------- From: Alex Syniakov <innochenti(a)gmail.com> Date: Tue, Apr 9, 2019 at 10:39 AM Subject: Re: delete_vertex issue To: <moebius(a)informatik.rwth-aachen.de> please see a minimal example for reproducing crash: #include <OpenMesh/Tools/Subdivider/Uniform/LoopT.hh> #include <OpenMesh/Tools/Subdivider/Uniform/Sqrt3T.hh> #include <OpenMesh/Tools/Subdivider/Uniform/Sqrt3InterpolatingSubdividerLabsikGreinerT.hh> #include <OpenMesh/Tools/Subdivider/Uniform/ModifiedButterFlyT.hh> #include <OpenMesh/Tools/Subdivider/Uniform/LongestEdgeT.hh> void crash() { OpenMesh::TriMesh_ArrayKernelT<> mesh; mesh.request_face_normals(); mesh.request_vertex_normals(); mesh.request_vertex_colors(); mesh.request_edge_colors(); mesh.request_face_colors(); mesh.request_vertex_status(); mesh.request_halfedge_status(); mesh.request_edge_status(); mesh.request_face_status(); OpenMesh::VertexHandle vhandle[8]; vhandle[0] = mesh.add_vertex(OpenMesh::TriMesh_ArrayKernelT<>::Point(-1, -1, 1)); vhandle[1] = mesh.add_vertex(OpenMesh::TriMesh_ArrayKernelT<>::Point(1, -1, 1)); vhandle[2] = mesh.add_vertex(OpenMesh::TriMesh_ArrayKernelT<>::Point(1, 1, 1)); vhandle[3] = mesh.add_vertex(OpenMesh::TriMesh_ArrayKernelT<>::Point(-1, 1, 1)); vhandle[4] = mesh.add_vertex(OpenMesh::TriMesh_ArrayKernelT<>::Point(-1, -1, -1)); vhandle[5] = mesh.add_vertex(OpenMesh::TriMesh_ArrayKernelT<>::Point(1, -1, -1)); vhandle[6] = mesh.add_vertex(OpenMesh::TriMesh_ArrayKernelT<>::Point(1, 1, -1)); vhandle[7] = mesh.add_vertex(OpenMesh::TriMesh_ArrayKernelT<>::Point(-1, 1, -1)); std::vector<OpenMesh::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); mesh.delete_vertex(vhandle[0]); mesh.garbage_collection(); OpenMesh::Subdivider::Uniform::LoopT<OpenMesh::TriMesh_ArrayKernelT<>, double> subdivider; subdivider.attach(mesh); subdivider(mesh, 1, true); //CRASH subdivider.detach(); } On Tue, Apr 9, 2019 at 2:06 AM Alex Syniakov <innochenti(a)gmail.com> wrote: > Hello, > > I don't know how to file a bug, but the next steps always repro for me in > OpenFlipper and OpenMesh: > 1. delete vertex in mesh (box for example) > 2. click subdivide > => Crash > > Thanks, > Alex > -- Thanks, Alex -- Thanks, Alex

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OpenMesh - Adding data to a face
by Billy Zinser 13 Mar '19

13 Mar '19

Hello again, I am trying to add a float data type to each face in my mesh. I am following the storing custom properties tutorial but I am a little confused on how to assign each face with an actual value. For example: OpenMesh::FPropHandleT<float> fprop_float; mesh.add_property(fprop_float, "fprop_float"); mesh.property(fprop_float).set_persistent(true); mesh.face(mesh.face_handle(1)) = 1.12; Thank you very much for your help and quick responses. - William

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