I recreated L4D2's melee mechanic in Godot [See pin comment]
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Published on ● Video Link: https://www.youtube.com/watch?v=nLrYpr1r3dQ
The Engine I use is Godot, you can achieve this kind of mechanic in any 3d game engine.
How this works is it pick points in a sphere, the center of this sphere is the player camera.
I am not 100% sure how valve did this, but I think I did a good job remaking this.
I know the hitbox just sucks sometimes, but you can't deny how creative this kind of hitbox is.