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I'm fairly new on blender (and I'm using version 2.8). I have a strange problem with the transparency of 2 objects. The geometries are identical but are imported from 2 different .obj files. How come they behave like this? Even if I combine them with CTRL + J it's the same thing.

I thank you for any help.enter image description here

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Check normals, doubled vertices, and possibly triangles to quads.

Normals: Ctrl+Shift+N "outside".

Merge doubled vertices: Edit mode, select all, Alt+M "by Distance".

Triangles to quads: Edit mode, select all, Alt+J.

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  • $\begingroup$ Thanks for the quick reply, Coby Randal. Unfortunately I have already tried everything you are advising me. But it doesn't turn. The only thing that improves the situation a little is "erase only the faces" and "fill in the holes". It's all today that I'm looking for Internet solutions, but without result. For this I tried to write a new post. $\endgroup$ Commented May 6, 2020 at 18:28
  • $\begingroup$ Can you upload the .blend so I can look at it? It sounds like you have bad geometry, like overlapping faces and edges. This likely either happened when exporting the obj or importing it. A quick fix could be the Remesh modifier, but I think you should find the root cause. I'd be happy to look at the file. $\endgroup$ Commented May 7, 2020 at 2:02

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