Textures are shaded with the assumption that lighting is coming from the top, but for tools, when used in-hand, the texture is flipped, and the lighting seems to be coming from the ground.
Attatched is a resourcepack that proposes a simple fix. May not work so well with asymetrical items like axes, but works perfectly for swords and pickaxes. (I whipped this up in a minute, so it only works for diamond swords in the main hand)
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I just noticed this today trying to use the “item/handheld“ model for an item in a resourcepack. All of them are upside down.
Funny thing is that the mace has this issue as well and it uses a different model, that being “handheld_mace“.
All “rods“ have the same issue as well while using “handheld_rod“.
Really anything with the base of “handheld“ has this issue.
Now that Im looking at these… So are the pickaxes…
The other tools are as well but they cant be mirrored so they dont have as much of an issue.
It's probably better to have consistency over fixing this for a few items, and leaving the rest shaded differently.