[URGENT] why do characters I create in blender when imported to unity have half of their bodies "broken" ?

Every time I create a character in blender, and make some animations with it, it breaks ounce I imported to unity.


As you can see in the GIF below only the right part of the character follows the camera. Is this a feature ? if yes can I remove it, if no how can I fix it


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@Frederico_Silva

I have a couple suggestions that might help:

1) In edit mode on Blender select all faces(‘A’ key) and press (keys ‘Ctrl + Shift + N’) or (‘Ctrl + N’)

2) Try selecting the whole mesh (A Key) and switching to Edit mode. Then click “Mesh” and go to “Normals”, then click “Recalculate Normals Outside”.

3) If your model is “closed” (like a box or character) disable DOUBLE SIDED, if not leave it enabled

4) Make sure there are no lighting or cameras (if there are, erease them all)

5) In edit mode select your model by pressing the “A” key then press the “W” key and in the pop up menu select “REMOVE DOUBLES” and accept.

Best of luck and Cheers.