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I have some throwing projectiles in my game including a throwing axe, and a batarang kinda weapon. As they were quite flat weapons, animating the spin was just a very simple mesh transform to alter the perspective.
When it came to doing the hammer, the above technique just did not look right due to it being a thicker weapon. Had to use a base mesh containing the top, bottom, left and right of the hammer which I would show and hide depending on the position of the spin. Looks very convincingly 3d, worked out well and looks great in game, enjoy!