Best way to detect when to curve a soccerball?

[obamagremlin (xvez)]

I’m working on a soccer system but I’m wondering what the best way to detect the “angle” that the player is hitting the ball at so that I can decide whether to curve left or right? Like an equation for it or something? Or if there’s a better way to detect this?

[azqjanna]

If they kick square on the ball it should not spin and not curve. If they kick slightly to one side it will spin and curve the opposite way I think. For consistent gameplay though I think it would be better to just use whether the player is holding left or right movement before the kick and use that as how much “spin” to add.