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Hello Blender Community,

I imported an OBJ mesh into Blender. When I set the shading to smooth some edges appear sharp and others don't, though I haven't added the edge split modifier.

If I go into Edit Mode I can see the blue lines indicating the sharp lines. I already checked if there are doubles by merging vertexes by distance and I checked if the normals are all pointing in the right direction. Does anybody know what happened here?

Here's a picture of the object: Here's a pictuer of the object in edit mode: enter image description here

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  • $\begingroup$ Clear split normals. In the object data section> Normals> clear custom split normals data $\endgroup$ – cegaton Jun 9 at 16:28
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    $\begingroup$ You say that you imported the mesh. Then it's likely that those edges/smoothing groups comes from the imported mesh. Hard edges are not the same as split edges. The faces can share common vertices even if the edge is sharp. $\endgroup$ – Jackdaw Jun 9 at 16:36
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I've figured it out by myself now: In Properties > Object Data > Normals > Auto Smooth. It's kinda like Edge split but not as an Modifier but it works the same, maybe even better.

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