hands/include/fh_ray.h, shared by the pointer helper and ft-screens (design
sections 2.4-2.5): a body model (torso yaw = head yaw low-passed, at most
30 deg behind; shoulders from it), the ray from the shoulder through the
knuckles (20 ms prediction), the pointing gate (show tests for 120 ms,
hide after 250 ms of a failed keep test; near and "off" hide at once;
held through a ray pinch), and One Euro filters on yaw, pitch and origin.
- pointer/tests/handray-test.cpp: body, gate timing and tests, filter
(just test-c).
- ft-handreplay --ray FILE: per set and hand, what the helper reads.
- pointer/tools/rayeval: the ray over a replay, with the head poses from the
ft-handtest probe's log of the same session (clock matched by the
published capture times): how often it shows, why not, jitter, the ray's
shift into a pinch.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
