OBJ Export (use render meshes option) is ignoring Edge Softening

Hello, It’s nice to have “Use render meshes” in the OBJ export, but unfortunately, it loses some stuff in the process. It is not including effects such as Edge Softening. On the right, you can see that the Extract Render Mesh command gives me expected results - correctly mapped and softened mesh.

meshe testy rhino 8.3dm (2.1 MB)

Tested in Rhino 7 and Rhino WIP

Nothing predicts upcoming problems

Export settings

How it looks in Blender

Important: If during OBJ export, you don’t use the “Use render meshes” option, you might get softened mesh but good luck with texture mapping…

1 Like

I wish I found this relation earlier… Thanks for pointing it out.
Extracting render meshes in Rhino before the export is not the best way for multiple reasons.
Also, it’s breaking every workflow based on the Object ID such as Datasmith export to Unreal Engine.
I hope it can be solved soon. Is there someone specific that I can ask for the help in that matter?

I would like to bump this thread because it bothers me too. It’s clearly a bug and sometimes a painful one.

Logged as RH-67571 OBJ export doesn’t include edge softening and assigned to @andy

RH-67571 OBJ export doesn’t include edge softening

has been fixed in the latest RhinoWIP. Please give it a try.

Hi, can you please show me how you managed it to work? I tested it on the same file and there is no difference, my softened Brep still has unmodified, sharp edges after export.

This issue was fixed but has not yet made it into Rhino. I’m still in the process of testing the code changes as it requires some low level changes to RhinoCommon.