Edit: See WIP results far below.
OK, so I have a simple mesh, which is “manually” welded at 180 degrees in Rhino, and the I export it as is from Rhino5 with
File | Export Selected. Testing that mesh with MeshMixer “
Inspector” command, that looks fine (leftmost screenshot).
But if then I check the option Welded (see fig 2)
Fig.1. a). Rhino all options cleared (=OK). b.) “Welded” is checked (not OK!), and c). My .obj-export component calling
mesh.Weld(180) before export (OK).
Fig. 2. Export options (no options but “Welded” in case b above:
If I tick the red ball in MeshMixer, the res surfaces are remove altogether leaving “strange surfaces” behind.
Fig 3. After “repair” (ticking the red ball) in MeshMixer:
In short, if first welding manually with the Rhino menu command
mesh.Weld(180), and leaving the mesh “Unmodified” on export, this problem doesn’t occur.
Edit 2: I tested this also in WIP, and WIP [doesn’t either] export a valid mesh
even when checking the option “
Welded”. The exact difference in the obj ouput file produced by Rh5 and Rh6 is shown in this diff (Rh5 to the left).
Fig.4 Diff Rh5 and Rh6:
And the bad (wip) result:
Edit: Modified the header.