From 8a274ecd30f2599158cc10397374edd853e03ef3 Mon Sep 17 00:00:00 2001
From: Syncer Deploy <syncer@a2acloud.io>
Date: Mon, 31 Aug 2026 13:32:00 -0400
Subject: [PATCH] fix dead air strafe direction

---
 packages/shared/src/dead-air-game.ts   |  8 ++++----
 packages/shared/test/dead-air.test.mjs | 17 +++++++++++++++++
 2 files changed, 21 insertions(+), 4 deletions(-)

diff --git a/packages/shared/src/dead-air-game.ts b/packages/shared/src/dead-air-game.ts
index e532376..9b50267 100644
--- a/packages/shared/src/dead-air-game.ts
+++ b/packages/shared/src/dead-air-game.ts
@@ -435,8 +435,8 @@ function simulatePlayer(player: DeadAirAuthorityPlayer, deltaSeconds: number): v
   const speed = player.sprinting && !player.carryingArtifact ? sprintSpeed : walkSpeed;
   const sin = Math.sin(player.yaw);
   const cos = Math.cos(player.yaw);
-  let desiredX = (sin * player.inputForward + cos * player.inputStrafe) * speed;
-  let desiredZ = (cos * player.inputForward - sin * player.inputStrafe) * speed;
+  let desiredX = (sin * player.inputForward - cos * player.inputStrafe) * speed;
+  let desiredZ = (cos * player.inputForward + sin * player.inputStrafe) * speed;
   const inputLength = Math.hypot(player.inputForward, player.inputStrafe);
   if (inputLength > 1) {
     desiredX /= inputLength;
@@ -457,8 +457,8 @@ function simulateVisiblePlayer(player: DeadAirPlayerView, deltaSeconds: number):
   const speed = player.sprinting && !player.carryingArtifact ? sprintSpeed : walkSpeed;
   const sin = Math.sin(player.yaw);
   const cos = Math.cos(player.yaw);
-  let desiredX = (sin * player.inputForward + cos * player.inputStrafe) * speed;
-  let desiredZ = (cos * player.inputForward - sin * player.inputStrafe) * speed;
+  let desiredX = (sin * player.inputForward - cos * player.inputStrafe) * speed;
+  let desiredZ = (cos * player.inputForward + sin * player.inputStrafe) * speed;
   const inputLength = Math.hypot(player.inputForward, player.inputStrafe);
   if (inputLength > 1) {
     desiredX /= inputLength;
diff --git a/packages/shared/test/dead-air.test.mjs b/packages/shared/test/dead-air.test.mjs
index 63c0d15..d79aca3 100644
--- a/packages/shared/test/dead-air.test.mjs
+++ b/packages/shared/test/dead-air.test.mjs
@@ -126,3 +126,20 @@ test("visible wardens expose pose but redact combat inventory", () => {
   assert.equal(replicated.magazine, null);
   assert.equal(replicated.reserve, null);
 });
+
+test("DEAD AIR strafe-right matches the first-person camera's screen right", () => {
+  const server = deadAirGame.createServer();
+  server.addPlayer(1);
+  const player = server.currentState.players.find((candidate) => candidate.id === 1);
+  player.x = 0;
+  player.z = 25;
+  player.yaw = 0;
+  assert.deepEqual(server.submitInput(1, {
+    sequence: 1,
+    targetTick: 1,
+    observedTick: 0,
+    input: input({ strafe: 1, yaw: 0 }),
+  }), { accepted: true });
+  server.step();
+  assert.ok(player.x < 0, `camera-right at yaw 0 should reduce world x, saw ${player.x}`);
+});