- OpenMesh - lists.rwth-aachen.de

Buiding deb package of OpenMesh
by Robert Niederreiter 11 Apr '22

11 Apr '22

Hi, i was going to try to build the deb packages for OpenMesh. However, i was immediately stopped in the first place, since there are rules contained building the apps which require QT4. In recent Ubuntu/Debian versions QT4 has been dropped. So i ask: * If building debian packages is something which happens in your CI (have not found anything in the code) * if the debian build rules may be a subject to change -> essentially skipping building the apps. Thanks, - Robert

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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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can't use read_mesh in python
by cherepashkin＠phystech.edu 29 Oct '21

29 Oct '21

I would like to use openmesh in python just to read a mesh from .obj from ShapeNet model. I did following: import openmesh as om from openmesh import * mesh = om.TriMesh() read_mesh(mesh, filename) And I have got error, "name 'read_mesh' is not defined". Was read_mesh replaced with something else?

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Fwd: OpenMesh Issue report
by Bruce Jones 12 Oct '21

12 Oct '21

Hi all, I am facing an issue dealing with complex faces in openmesh via the python interface. I have a mesh I am loading via trimesh (hard requirement at this time), and using that to build an openmesh mesh. This mesh (and others i work with) is degenerate in the sense that it has complex faces, and trying to ignore that problem leads to the python process crashing (either hanging or segfault/bus error depending on the mesh). If i proactively try to delete the complex faces immediately after they are created, I get a seg fault. I have attached a minimum working example complete with degenerate STL, I would appreciate any assistance debugging this and/or working around it! Cheers, Bruce

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Bug report
by Ramakrishnan Mukundan 14 Sep '21

14 Sep '21

Hi, I would like to report a bug in OBJReader of Open Mesh. I have written a program to read OBJ files and to render them using OpenGL. This program uses OpenMesh for loading files. When I load the attached file (CubeCol.obj), the program displays a gray coloured cube instead of a red cube (CubeCol.mtl defines the colour of the cube as red). All other object loaders and viewers (including Windows 3D viewer) displays the cube correctly with a red colour. I spent hours trying to identify the problem, and finally found out that if I remove the space character at the beginning of the last three lines in CubeCol.mtl, the cube gets displayed correctly. Apparently, OBJReader ignores lines in the mtl file where there is a space character in the first column. All other obj readers that I have used load the file correctly. Also, I have noticed that it is not sufficient to request face colours (mesh.request_face_colors()) before reading the mesh file to get the colour values from the mtl file. I also had to include IO::Options::FaceColor as the argument for the read_mesh() function to get face colours using mesh.color(faceHandle); I couldn't find any documentation giving the actual procedure for loading data from mtl files. Please let me know if I am using the correct method for loading obj files along with material properties. Thank you. Kind regards, Mukundan mukundan2013(a)gmail.com

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Cite OpenMesh in scientific publications
by btyukodi＠brandeis.edu 27 Aug '21

27 Aug '21

Dear All, I am about to submit a paper where I used a simulation which uses OpenMesh. First, let me thank the developers, contributors and everyone on this forum who helped me with my questions and problems on the way. Second, I was wondering whether there is one or more papers you would prefer me to cite. Thank you, Botond

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openmesh-python: OpenMesh submodule version
by Philipp Auersperg-Castell 18 Aug '21

18 Aug '21

Hi OpenMeshers, currently the OpenMesh submodule is at db8c0608830ae7324b2b2e1d91e4db565b2d3eae dated from Apr 23. I wanted to bump to OpenMesh master, but there are serveral incompatibilities in the build. as the git log tells, there are serveral changes to Openmesh, so it would be fine to have the new version bundled. So I wanted to ask if there are plans to bump to a newer OpenMesh version? Best regards in advance Philipp

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Ignore shared objects
by Robert Niederreiter 24 Jun '21

24 Jun '21

Hi, Attached you find a patch for ignoring shared objects in openmesh-python. I added this to avoid unneccesary terminal overhead with git submodules. Is it possible to apply this patch upstream? BTW - what's the preferred way you want to receive possible patches/contributions? Thanks - Robert

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Exposing subdivision tools via openmesh-python
by Robert Niederreiter 23 Jun '21

23 Jun '21

Hi, are there any plans to expose subdivision API (https://www.graphics.rwth-aachen.de/media/openmesh_static/Documentations/Op…) in openmesh-python? Thanks -Robert

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