March 2022 - OpenMesh - lists.rwth-aachen.de

OpenMesh with OpenMP
by LuWang (Jack) 13 Dec '23

13 Dec '23

Hello Madam or Sir, I am the user of OpenMesh, and I want ask some questions about the parallel code with OpenMesh, exactly, the parallel code is based on OpenMP on the VS2013. The first question: When I use the OpenMP on the VS2013 to speed up the program which write with OpenMesh, for example, I add the code: #pragma omp parallel for num_threads(7) , just like the following: and the errors follow, and I do not know why. and the second question: Could the code with iterator of OpenMesh be paralleled by OpenMP just like " for (TriMesh::FaceIter f_it = mesh.faces_begin(); f_it != mesh.faces_end(); f_it++) " in the above picture? or How can I parallel the code with iterator of OpenMesh? Thank you for your time! And I am looking forward to your reply. Sincerely LuWang

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texture file support
by Philipp Auersperg-Castell 07 Mar '22

07 Mar '22

Hi Folks, for our project we needed support for texture files and have built it into Openmesh and also exposed it in openmesh-python. What we did in detail: OpenMesh: - added param 'texture_file' to the Options class, it specifies the path to the texture file - added param 'material_file_extension' to the Options class, it specifies the material file suffix, default is ".mat" as it was before, we needed it becuase Blender expects ".mtl" - removed default and copy constructor and destructor as well as assignment operator, because these are not necessary here, see https://en.cppreference.com/w/cpp/language/rule_of_three openmesh-python: - exposed the above features - exposed .is_locked and .set_locked - documented it in trimesh.rst I attatched the git diffs for OpenMesh and openmesh-python. Please let me know if it could be merged and if necessary what we could do better ;) regards Philipp Auersperg-Castell

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How to iterate over the vertices of a poly face and alter the humber
by camilotalero96＠hotmail.com 07 Mar '22

07 Mar '22

Pretty much the title. I am trying to clip a mesh against a plane, to that effect i need to check each face against the plane and either delete the face or modify it introducing new vertices. I am trying this to access the vertices: ```cpp MyMesh::FaceIter f_it, v_end(mesh.faces_end()); uint count = 0; for (f_it=mesh.faces_begin(); f_it!=v_end;) { auto old_it = f_it; MyMesh::FaceVertexCCWIter fv_iter = mesh.fv_ccwiter(old_it); std::vector< MyMesh::VertexIter > new_face_verts; for (; fv_iter.is_valid(); ++fv_iter) { mesh.point(fv_iter); } ++f_it; mesh.delete_face(*old_it, true); } mesh.garbage_collection(); ``` But this is apparently invalid. As no method in the mesh accepts that iterator.

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