ball op• Data kinds: signal × points × table → table
• Call: import fullseye as fs; fs.ledger.drag_fit(t, p, bp: 'dict', *, iters: 'int' = 20, dt: 'float' = 0.001) -> 'dict' (to call the implementation directly, import ballistics; ballistics.drag_fit(t, p, bp: 'dict', *, iters: 'int' = 20, dt: 'float' = 0.001) -> 'dict'; from the registry, opsdrive.get("drag_fit"))
• GPU: none (CPU reference implementation only)
Fits the "gravity + drag" model to a trajectory (t_i, p_i) with 7 parameters (p₀, v₀, C_d) (5 for planar input) — the no-thrust version of thrust_fit (flight_fit keeps C_d known with 6 parameters; this one identifies C_d too). The result keys and the entrance checks (dt ≤ sample spacing, iters ≥ 1, vacuum refused) are those of thrust_fit, with thrust a zero vector. From a ground-truth trajectory C_d returns to 1e-4 (gate).
Empty input (t with 0 elements) raises ValueError.
• Sample-data catalog (download URLs / licences) — 2-D uses skimage.data (BSD/public domain) plus synthetic images; 3-D lists download URLs for real data sources (Stanford, PDS, …).
• Operator provenance and references — the sources of the research/methods this op family came from.
• The canonical algorithm (author, year) and its uses are named in the family usage guide above.
• poc_video_physics_consistency — py -3.11 examples/poc_video_physics_consistency.py
table as input)course_layout · course_occupancy · course_contains · world_build · world_camera · world_move · lidar_scan · rss_longitudinal_same
ball)ball_params · impact_params · flight_vacuum · flight_ode · flight_simulate · flight_state_at · magnus_lift_coefficient · drag_coefficient_sphere
*Provenance: ballistics.py — DRIVE operator registry. This per-op note is generated by tools/opdocs.py md (do not hand-edit).*
© 2026 Kazufumi Furuse — Fullseye operator documentation. Licensed under Apache-2.0.