The hull shader ran over each piece's box; a forearm across the panel covered a fraction of
it. Now the polygon grown by the margin and the feather is drawn, and fragments outside a
piece are discarded (no blend). The forearm is a stub toward the elbow (18 cm at the average
hand size, as the capsules' 16 cm): the elbow is a guess and a longer piece costs a bigger
redraw. tests/matte_bench.cpp (scripts/bench-matte.sh) times the composite offline on the GPU,
mesh against capsules, frame by frame in turn.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
- handcut: reads fh_hands version 2 (the skeleton's joints, radii, elbow, pinch point; version 1
still works) and the gestures file; the matte is hand-shaped: a tapered capsule per finger
bone, the palm and the thumb's web as convex slabs, the forearm toward the elbow, drawn with
a soft-edged convex polygon shader; its margin is an angle from the eyes plus motion
(HANDS_MATTE_MARGIN, _MOTION, _MOTION_MAX), the capsules stay selectable (HANDS_MATTE), and a
per-distance correction hook is off by default (HANDS_MATTE_SHIFT). The CPU part is in
handcut.cpp (no GPU or SteamVR calls), the renderer in handrender.cpp.
- handinput: the near claim, poke to click (index straight and nearest, two frames at the
surface, an approach speed or 1 cm deep, release 1.5 cm out or 1 cm back, the click held
still until a 1.5 cm slide, re-press guard, through-the-panel release), pokes on the curve,
reset, dock and close buttons, pinch on the bar, edges, corners, tab or title bar to move
(facing the head) or resize, two hands to stretch and turn, two hands to one, lost hands.
- vr.cpp: hands read once per tick, "hands <L> <R> <allowed>" from the pointer helper, "near
<capture_ns> <L> <R>" to it per hands frame, want-hz while near, glows on the cutout buffer,
hand holders for KWin's button and carried panels, the handinput and cutouts commands.
- tests/handinput_test.cpp: unit tests, and replays of ft-handreplay --publish-dump
(scripts/test-handinput.sh, justfile test-c).
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
