Missing faces on a mesh when importing FBX from blender

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Hello! :smiley:
I’m new to unreal engine and I’m scratching my head over an issue with my imported FBX model. In some places my model is just missing faces.

The model looks fine in blender and I’ve confirmed that inverted faces is not the problem!

Strangely enough the model looks correct even in Unreal if I go into: Modelling Mode > Mesh Attributes > Normals. If you then try to apply any of the “changes”, it does nothing and returns the model to the glitched state.
To better explain this I’ve recorded a video to show you exactly what I’m talking about: https://youtu.be/1QV1ML1EcSM

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I had similar problems with some models I created in Blender.

Possible solution in Blender:

Edit Mode, Faces, All, Alt+N (recalculate outside for objects or inside for rooms).

Sometimes it only works if you select only the affected faces and then press Alt+N.

Possible cause in Blender (and other 3D programs): Using the Mirror function almost guarantees these kinds of errors. You won’t see them in the program itself. Only when you export to another application are the mirrored surfaces misinterpreted.

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