See the angle.
Not just the replay.

Explore modeled sightline obstructions and compare alternative positions.

Synthetic plays · Lead / Trail / Slot · Simplified bodies · Geometry, not gaze

Half-court set, right basket. A1 drives baseline-side; B1 slides into the restricted-area edge. Compare what the Lead, Trail and Slot positions can geometrically see of the contact region at the marked instant.

Top-down · world x / z (m)

All sampled paths obstructedPaths

━ path, no modeled obstruction━ ┅ path stopped at blocker◆ selected official (drag)■ team A ■ team BBodies are simplified geometric proxies.

18.00 / 19.00 s

Ticks = annotation keyframes (not video frames)

Speed

Modeled eye-level view · Camera aimed at target

○ clear sample · ✕ obstructed sample

Original position

Three-person mechanics

t = 18.00 s

Drive into the restricted area with a secondary defender sliding over.

No modeled obstruction from: Slot. Scrub the timeline to see how this changes.

Coverage context

Lead: baseline, typically primary on plays in the paint.
Slot: free-throw line extended, often has the side angle on drives.
Trail: top, watches the backcourt side and the shooter area.

From which modeled position is the contact region geometrically visible at the contact instant?

Synthetic play, invented positions. Geometry only — not where anyone looked, whether a foul occurred, or whether a call was correct.

Selected official

t = 18.00 s

Original modeled position: All sampled paths obstructed
5 of 5 sampled paths obstructed · blocker: B1
Alternative position: Drag the orange L marker, or focus it and use arrow keys (Shift = 0.5 m). Playback pauses; the original is kept.

Original marker

Other actors are held at their recorded or synthetic positions. This comparison does not predict how play would change.

Target & model

defaults are assumptions

Contact region A1/B1 · 0.30 × 0.30 m region · 5 fixed samples

L eye height1.75 mTarget height1.20 mTorso width (all players)0.46 m

Assumption sensitivity

The classification is unchanged under the small perturbations below.

= Official x +0.25 m: All sampled paths obstructed
= Official x −0.25 m: All sampled paths obstructed
= Official z +0.25 m: All sampled paths obstructed
= Official z −0.25 m: All sampled paths obstructed
= Eye height +0.10 m: All sampled paths obstructed
= Eye height −0.10 m: All sampled paths obstructed

Annotation mode

Reference video · coming later — use Sessions to analyze a recording

Keys: Space play/pause · , / . step 0.1 s · 1–3 select official · arrows move focused official

See the angle.Not just the replay.

Selected official

Target & model

Assumption sensitivity

Annotation mode

See the angle.
Not just the replay.