Surface which doesn't seem closed


I have a small question. Sometimes I have a surface which doesn’t seem to be closed as certain “shader lines” (indicated with the red crosses in the image) are not connected to the boundary of the surface (see attached file). With these surfaces I sometimes have problems joining surfaces afterwards

Kind regards

Cogship_question1.3dm (127.3 KB)

Usually that means your edges have been pulled out of tolerance by some previous joining operation, or JoinEdge or something like that. Try RebuildEdges to bring the edges back to the surface.

Yep. Your surface edges to be joined need to be within tolerance of each other for the join to be successful.