Hi Charles, you probably already saw this but for completeness sake, the questions were answered here: https://stackoverflow.com/questions/51174821/is-it-possible-to-save-a-mesh-i... https://stackoverflow.com/questions/50413319/how-to-save-custom-vertex-prope... Regards, - Isaak Lim On 07/04/2018 04:19 PM, Charles Duvert wrote:

Hello everybody,

First, thanks a lot for your neat work on openmesh! I am creating meshes for 3D modelling as a part of my masters thesis and I am glad to use a well written library.

I am able to build many things  and play with it thanks to openmesh, however I encounter some troubles from time to time. I asked some communities (stackoverflow for instance) but the subject does not seem to be hot right now, and experts are hard to find, so I am asking you.

I use openmesh with Python 3.6. Openmesh was installed with a 'pip install openmesh' :

*1/ First*, I wanted to add custom propetries to vertices of the mesh, it does work but does not write in the file, or it is not read when the file is re-opened, here is my code :

|importopenmesh asOM importnumpy asnp mesh =OM.TriMesh()#Add some verticesvh0 =mesh.add_vertex(np.array([0,0,0]));vh1 =mesh.add_vertex(np.array([1,0,0]));vh2 =mesh.add_vertex(np.array([1,1,0]));vh3 =mesh.add_vertex(np.array([0,1,0]));#Create some datadata =np.arange(mesh.n_vertices)#Add custom propertyforvh inmesh.vertices():mesh.set_vertex_property('prop1',vh,data[vh.idx()])#Check properties have been added correctlyprint(mesh.vertex_property('prop1'))#prints data matrix OM.write_mesh('mesh.om <http://mesh.om>',mesh)|

|#Re-load mesh in another instance : |

|mesh1 =OM.TriMesh()mesh1 =OM.read_trimesh('mesh.om <http://mesh.om>')#Check property is still there print(mesh1.vertex_property('prop1')) |

|#Prints a matrix of 'None'... |

So, I cannot save then read a custom property. (So far, I save custom properties into a csv file, which is okay but not convienient.)

*2/ Another issue* I encounter is when I want to save a mesh into a vtk file. The writter writes nothing . Here is my code :

|importopenmesh asOM mesh =OM.TriMesh()#Add some verticesvh0 =mesh.add_vertex([0,0,0])vh1 =mesh.add_vertex([0,1,1])vh2 =mesh.add_vertex([1,0,1])vh3 =mesh.add_vertex([1,1,0])#Add some faces (we are building a tetrahedron here)mesh.add_face(vh0,vh1,vh2)mesh.add_face(vh0,vh2,vh3)mesh.add_face(vh0,vh3,vh1)mesh.add_face(vh1,vh3,vh2)OM.write_mesh('TEST_MESH.vtk',mesh)

|

|Nothing is written. (When I put .ply or .om ... instead of .vtk, it works just fine) |

According to the documentation, it should work, so I don't know what I am doing wrong. If you have any tips or advices, it would be very appreciated,

Thank you for your time, thank you for your help,

Charles Duvert.

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