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I am new to blender so bear with me.

So I've been testing baking textures on models with multiple materials and it usually goes fine but this time after the bake was completed there were weird anomalies on the finished texture. Some parts were brighter, some parts were completely colored wrong and I don't understand why.

I have the blend file here: https://pasteall.org/blend/7fd1e2824ec6469585b849ee35db8a60

Left: Model with multiple materials. Right: Model with only the baked texture applied to it.

Left: Backside of the model with only the baked texture applied to it. Right: Backside of model with multiple materials. Baking settings.

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    $\begingroup$ Hello, you don't share your high poly nor your normal map, but I see that you have custom split normals, maybe your problem comes from here? Object Data > Geometry Data > Clear Custom Split Normals Data $\endgroup$
    – moonboots
    Commented Sep 3, 2021 at 11:54
  • $\begingroup$ @moonboots YEP that completely fixed the issue. Livesaver. Thanks a lot :) $\endgroup$
    – kachow
    Commented Sep 3, 2021 at 12:49

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You have custom split normals, which can happen with imported FBX, it causes weird shadings, go into Object Data > Geometry Data > and press on Clear Custom Split Normals Data.

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