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The problem with variable spin, is that when you spin, lets say along the x and y axis, it doesn't spin along 2 axes, but spins along the x=y axis, so it will curve diagonally. Variable spin on a solid sphere is very complicated, and I'm trying to figure out a way how, and haven't yet. If you think about a bowling ball, the spin on the ball will automatically stablize until it is no longer a variable spin.
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