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6 months ago in Space Law By Omar

How does fitts’s law work in vr and 3d space?

We all know Fitts's Law for clicking buttons on a screen. But how do you calculate the difficulty of grabbing something floating in mid-air in VR?

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By Akram Answered 2 months ago

Same logic, different geometry. Instead of a 2D target width, you use the target's 3D size usually its spherical volume or the cross-section facing you. And instead of a flat distance, you use the straight-line Euclidean distance from your hand to the object. Plug those into the formula and you get the Index of Difficulty for 3D. It's not perfect, but it works well enough for designing VR interactions.

 

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