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Editorial Team
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Asked: 2026-05-26T15:10:41+00:00

When someone points a finger, his finger is pointing in a specific direction, right

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When someone points a finger, his finger is pointing in a specific direction, right ?
ok, so when a user touches the iPad, i would like to know where that touch came from. I am not saying on the iPad. I mean where is the user physically positioned compared to the iPad.
You could say “easy ! You just check the orientation of the iPad and you got it.”
There’s the problem. In my scenario there are 2 users, each on a different side of the iPad, and my objective is to determine which of the 2 users touched the iPad.
I know that on Microsoft Surface, you can determine that information by looking at the shadow created by the finger on the surface. Unfortunately, it can’t work on the iPad since the touches aren’t recovered by cameras.

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  1. Editorial Team

    Unfortunately, it can’t work on the iPad since the touches aren’t recovered by cameras.

    Well, yes. You’ve answered your own question. The touch event is just an event on the surface of the screen. If both users can touch anywhere on the screen, you’ve got no way of knowing who did it.

    You could possibly ask player 1 to use one finger and player 2 to use two fingers, but this would be a bit unfair on player 2, or you could read the touches as miniature drags and guess that each player was pushing away from themselves, but that may not work in the context of your game.

    (I’ve assumed you are talking about a game)

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