I’m just now trying to figure out meshes. I’ve imported a mesh and done a little manipulation on it. I want to trim the left hand side of the piece off and mirror a new left from the right. I cannot get trim or split to work. Not sure where to start to understand what I’m doing wrong. Can someone get me pointed in the right direction?
thanks, rex
Hello - one thing you’ll find (have found… ) is that Rhino’s mesh intersection tools are not very strong… it looks like you may have already tried to split this mesh - do you have the original handy still? It might still be possible. On thing you can do is run DeleteMeshFaces and carefully widow around the faces to remove on one side.
@black33ford, before using Rhino’s mesh tools you better check if the mesh is bad using the _Check command. Your mesh had non manifold faces, duplicates and selfintersections. After cleaning this up a bit, _MeshSplit using a surface works.
The mesh was created with a photogrammetry process. It was converted from a point cloud and then given to me. I did some triangle reduction and smoothing using Mecsoft’s mesh tool in RhinoCam. I did not seem to be able to fill all the holes in the mesh, so it was not a closed mesh.
Thanks Clement. I was able to split and mirror your result. Where can I find more out about the meaning of manifold faces, duplicates, and selfintersections?
rex
If you search this forum there is a lot of info about that. To find the problematic areas like naked edges in your mesh i’ve used _Check and _ShowEdges, then used the mesh tools like _DeleteMeshFaces, _FillMeshHole, _CollapseVertex etc. finally used _Weld 180 to really close it.
non manifold faces means there are mesh edges shared by more than two faces.
duplicate mesh faces means mesh faces which are exactly on-top of each other.
self intersection means mesh faces which intersect through other faces in the same mesh.