3D Selection Vault

Predictive Contour Pursuit

Also known as Predictive smooth pursuit

An AR version of Outline Pursuits: each object, including hidden ones, gets a contour drawn from the current viewpoint with a ball moving along it, and the user picks an object by following its ball with their eyes, even while the ball passes behind other objects.

How it works

On a HoloLens 2, every selectable object gets a view-dependent contour, and a small ball travels around each contour at 8°/s. The system correlates the eye movement with each ball's path (Pearson r above 0.9 for 500 ms within a 350 ms window) and selects the matching object. For occluded targets the authors predict the ball's path through the hidden part so the pursuit can continue. Experiment 1 compared three contour styles (Original, Cut, Shared) at 20, 50 and 80% occlusion and found the full original contour best. Experiment 2 varied pre-tracking time and the length of the hidden stretch and recommends at least 400 ms of pre-tracking and no more than 600 ms of hidden path. 20 participants.

Papers