tools+docs: the pitch stick sign was inverted - the pilot fires now

Measured, not argued: command a 45-degree-off-the-nose error and watch whether it
shrinks, both axes, both sides, two pulse widths, with the opposite sign as a
control. Yaw's sign is correct (45 -> 11.3/32.7 at 0.6 s, 41.6/33.8 at 1.2 s).
Pitch's is inverted - the pilot's own sign GREW the error every time
(48.3/55.6/70.7/91.7) and the opposite shrank it every time (30.7/41.5/15.7/9.6).

A method artefact is recorded because it gave the opposite answer first: a 3 s
full-deflection pulse overshoots a 45-degree error so far that BOTH signs look
wrong (45 -> 164 and 45 -> 178). A long pulse cannot answer a sign question.

Verified against the game rather than by inspection. Before: fire=1 in 0 of 13521
samples, |aim yaw| pinned at 90.0, target 36-43 km away. After: 43 of 1732, aim
down to 2.3 degrees, range median 6.3 km, and the HUD's own ammunition counters
moving - NOSE BM 06000 -> 05723, MAIN MPM 00300 -> 00298.

Also fixed a leftover of the same FIFO era: pilot.py called pad.f.write("tap A
90") for the target-select double tap, which raised AttributeError once Pad
stopped having an `f`. Pad gained tap()/dpad(); ctrl_probe.py and target_probe.py
still use pad.f and now say so in place.

Still open: YOU KILLED is 0000 after 250 s of firing and REMAINING OB is still
012. The craft shoots, closes and selects; whether it destroys anything is next.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01PMRJjbxLqZtsb5Vb7KunPE

tools/re-capture/ctrl_probe.py

@@ -27,6 +27,12 @@ import math
 import os
 import struct
 import sys
+
+# 🔴 DEAD FIFO HANDLE: this file uses `pad.f.write(...)`, the old vgamepad
+# server protocol. flight_probe.Pad no longer has an `f` — it writes Canary's
+# --hid=file pad file instead — so these calls now raise AttributeError. Use
+# pad.tap()/pad.dpad(). Not converted here: neither tool has been re-run since.
+# See docs/re/pilot-never-fires.md.
 import time
 
 import numpy as np

tools/re-capture/flight_probe.py

@@ -99,6 +99,28 @@ class Pad:
         self.buttons.clear()
         self._write()
 
+    def tap(self, b, secs=0.09):
+        """Press and release, blocking for `secs`.
+
+        The old FIFO server slept on the *server* side, so callers wrote
+        `tap A 90` and carried on; `pilot.py` still did that through `pad.f`,
+        which this class no longer has. Here the caller pays the 90 ms. That is
+        acceptable only because the one caller — the double-tap that selects a
+        target — is rate-limited; do not put this in a per-tick path.
+        """
+        self.press(b)
+        time.sleep(secs)
+        self.release(b)
+
+    def dpad(self, direction, secs=0.06):
+        """One d-pad step; `center` releases all four."""
+        for d in ("UP", "DOWN", "LEFT", "RIGHT"):
+            self.buttons.discard(d)
+        if direction.lower() == "center":
+            self._write()
+            return
+        self.tap(direction.upper(), secs)
+
     def vector(self):
         return [self.state[k] for k in ("LX", "LY", "RX", "RY", "LT", "RT")]
 

tools/re-capture/pilot.py

@@ -283,8 +283,9 @@ class Pilot:
         """A, twice: make the GAME target what we are already pointing at."""
         if self.dry or t - self.select_t < self.SELECT_PERIOD:
             return
-        self.pad.f.write("tap A 90\n")
-        self.pad.f.write("tap A 90\n")
+        # Target select is (A) pressed TWICE — see autopilot-memory-driven.md.
+        self.pad.tap("A", 0.09)
+        self.pad.tap("A", 0.09)
         self.select_t = t
         self.selects += 1
 
@@ -404,7 +405,17 @@ class Pilot:
         if ez < 0:                        # target behind: commit to a full turn
             yaw = math.copysign(math.pi / 2, ex if ex else 1.0)
         sx = max(-1.0, min(1.0, self.KP * yaw - self.KD * float(np.dot(w, up))))
-        sy = max(-1.0, min(1.0, -(self.KP * pitch - self.KD * float(np.dot(w, right)))))
+        # 🔴 The leading minus was WRONG and is measured out (2026-08-23). With
+        # the pad finally reaching the game, a 45°-off-the-nose error was
+        # commanded with this convention and with its opposite, at 0.6 s and
+        # 1.2 s pulses, both sides: the pilot's own sign GREW the error every
+        # time (45° -> 48/56/71/92) and the opposite sign SHRANK it every time
+        # (45° -> 31/41/16/10). Yaw's sign, tested the same way, is correct.
+        #
+        # Method note, because the first attempt got the opposite answer: a 3 s
+        # full-deflection pulse OVERSHOOTS a 45° error so far that both signs
+        # look wrong. Pulse short, or measure the initial rotation direction.
+        sy = max(-1.0, min(1.0, self.KP * pitch - self.KD * float(np.dot(w, right))))
         return sx, sy, yaw, pitch
 
     # ---------------------------------------------------------------- step

tools/re-capture/stick_sign.py

@@ -0,0 +1,112 @@
+#!/usr/bin/env python3
+"""Does `pilot.py`'s stick sign REDUCE its own aim error, or grow it?
+
+With the pad finally reaching the game (`pilot-never-fires.md`), the pilot still
+fires 0 times in 150 s and `|aim yaw|` stays pinned at exactly 90° — the `ez < 0`
+branch, i.e. the target is astern and stays astern. A controller whose stick sign
+is inverted looks exactly like that: it turns away from the error it is nulling,
+so the target never comes round the front.
+
+The test is direct and needs no target. Pick a direction 45° off the nose in the
+ship's own frame, freeze it in WORLD coordinates, command the deflection
+`sticks()` would command for that error, and see whether the error falls or
+rises. Both signs are tested, because one of them agreeing by luck would prove
+nothing.
+
+`sticks()`'s convention, replicated exactly:
+
+    fwd   = M[fwd_row] * fwd_sign
+    right = M[(fwd_row + 1) % 3]
+    up    = cross(fwd, right)
+    yaw   = atan2(dot(want, right), dot(want, fwd))
+    sx    =  KP*yaw   - KD*(body rate about up)
+    sy    = -(KP*pitch - KD*(body rate about right))
+
+The KD terms are dropped here: the P term saturates the stick anyway, and a
+damping term cannot flip a sign.
+
+Usage: stick_sign.py <nav-live.json> [seconds_per_phase]
+"""
+import json
+import math
+import os
+import sys
+import time
+
+import numpy as np
+
+sys.path.insert(0, os.path.dirname(os.path.abspath(__file__)))
+import frozen     # noqa: E402
+import navigator  # noqa: E402
+from flight_probe import Pad  # noqa: E402
+
+
+def main():
+    cfg = json.load(open(sys.argv[1]))
+    secs = float(sys.argv[2]) if len(sys.argv) > 2 else 3.0
+    W = navigator.World(cfg)
+    W.scan()
+    pad = Pad()
+
+    def frame():
+        ents = W.sample(time.time())
+        me = next((e for e in ents if "Player" in e[1]), None)
+        if me is None:
+            return None
+        M = W.rot(me[0])
+        if M is None:
+            return None
+        fwd = M[W.fwd_row] * W.fwd_sign
+        right = M[(W.fwd_row + 1) % 3]
+        return fwd, right, np.cross(fwd, right)
+
+    def err(want, f):
+        fwd, right, up = f
+        yaw = math.atan2(float(np.dot(want, right)), float(np.dot(want, fwd)))
+        pitch = math.atan2(float(np.dot(want, up)), float(np.dot(want, fwd)))
+        return math.degrees(yaw), math.degrees(pitch)
+
+    def trial(axis, side):
+        f0 = frame()
+        if f0 is None:
+            print(f"{axis}{side:+d}: no player/orientation")
+            return
+        fwd, right, up = f0
+        base = right if axis == "yaw" else up
+        want = fwd * math.cos(math.radians(45)) + base * side * math.sin(math.radians(45))
+        want = want / np.linalg.norm(want)
+        y0, p0 = err(want, f0)
+        # what sticks() would command for this error
+        if axis == "yaw":
+            pad.axis("LX", math.copysign(1.0, y0))
+            cmd = f"LX={math.copysign(1.0, y0):+.0f}"
+        else:
+            pad.axis("LY", -math.copysign(1.0, p0))
+            cmd = f"LY={-math.copysign(1.0, p0):+.0f}"
+        time.sleep(secs)
+        pad.reset()
+        f1 = frame()
+        froze = frozen.frozen(3.0)[0]
+        if f1 is None:
+            print(f"{axis}{side:+d}: lost the player")
+            return
+        y1, p1 = err(want, f1)
+        e0, e1 = (abs(y0), abs(y1)) if axis == "yaw" else (abs(p0), abs(p1))
+        verdict = "REDUCES (sign correct)" if e1 < e0 - 1.0 else (
+            "GROWS (sign INVERTED)" if e1 > e0 + 1.0 else "no change")
+        print(f"{axis} want{side:+d} {cmd}: |err| {e0:6.2f} -> {e1:6.2f} deg   "
+              f"{verdict}{'   *** FROZE - DISCARD ***' if froze else ''}")
+
+    if frozen.frozen(3.0)[0]:
+        print("# GUEST IS ALREADY FROZEN — nothing to measure")
+        return 3
+    for axis in ("yaw", "pitch"):
+        for side in (+1, -1):
+            trial(axis, side)
+            time.sleep(1.0)
+    pad.reset()
+    return 0
+
+
+if __name__ == "__main__":
+    raise SystemExit(main())

tools/re-capture/target_probe.py

@@ -28,6 +28,12 @@ import json
 import os
 import struct
 import sys
+
+# 🔴 DEAD FIFO HANDLE: this file uses `pad.f.write(...)`, the old vgamepad
+# server protocol. flight_probe.Pad no longer has an `f` — it writes Canary's
+# --hid=file pad file instead — so these calls now raise AttributeError. Use
+# pad.tap()/pad.dpad(). Not converted here: neither tool has been re-run since.
+# See docs/re/pilot-never-fires.md.
 import time
 
 import numpy as np