I read the same OBJ mesh file using both Meshlab and Isaac Sim, but I noticed that the visual results in the two software differ significantly. Meshlab displays the model with sharp angles, while Isaac Sim shows a much smoother model. In fact, the visual output in MeshLab is closer to the actual shape of the real object, which has distinct sharp edges.
@little_bob i could be wrong, but looks like it might be related to weighted normal on the mesh prim. what OBJ export options were used? and out of curiosity, do you also see the same shading behavior when using FBX format?
oh, looks like the dialog you showed is for importing, i wa actually referring to the program that exported the mesh, there might be a setting when exporting that determines the weighted normal. and FBX is just another format, it’s a pretty universal one that translates between various programs that sometimes work better than an OBJ (depending on what type of data you wish to embed into the file)
that being said, as it comes to the importing dialog, have you try toggling off smooth normal option in the import dialog to see how the imported mesh displays?
In the options for converting obj to usd, I tried turning “Generate Smooth Rotations” on and off, but the display results were almost the same in both cases, so this action was of no use to me.
sorry if there was some confusion, i was referring to Generate Smooth Normals; and not Generate Smooth Rotations
I think simplychenable is right here. That import setting import smooth normals looks mighty suspicious. Toggle that one and off to see if the difference lies there.
Also, as a test, I would open this in a different program like blender to see whether the hard faces come across, then it would help narrow down whether the issue lies within the exporter, or the importer.