How to fix deformation of modular pieces from a near view while using Nanite?

Something is happend to my modular pices when i using Nanite. They gets a bigger deformation while the number of pieces increase. The real problem is that this happen while the camera is too near to the pieces and the players can see it.

I have taken some videos so you can see exactly what i saying.

The first video is from Blender, here you can see the real form of the pieces.

The second video is from the UE5 viewport. In this case i’m not using Nanite, you can see the pieces aspect is very similar to the pieces aspec in Blender.

In the third video i’m using Nanite. In this case for one piece only. You can see now, the piece is a little bit deformed. However it still being acceptable. (No bad)

In the forth video i’m using Nanite too. In this case for three pieces. You can see the pieces has a important deformtion now. (i can not use them in my game like that).

And finally, In the fifth video, i’m using Nanite too. In this case for five pieces. You can see this can be worse each time you add more pieces to the structure.

I thought maybe the problem could be because i’m importing the pieces joined from Blender, so i merged the meshes during the FBX impotation to UE5. But i got the same result.

Also i tried to import the totally separate pìces and create groups from the Editor but the problem must be for other reason becouse this does not works too.

So my question is… What is really happening? How i can fix it?

Thank you so much!!

I found that “Fallback relative error” parameter in the mesh Nanite settings was too high and this caused the deformation. I set it to 0.2 intead of 1 and now it looks much better. However i’m not sure if it is the optimal configuration.

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Also, i think is not good idea joint of large size pieces together because Nanite and LODs depend of the camera distance. This is my conclusion after 10 days testing. (if i am wrong, please let me know).