feat: add footsteps

src/app/fear/scene-components/player.tsx

@@ -54,10 +54,32 @@ export default function Player() {
     const confirmedSegment = useRef<number>(0);
     const hasTriggeredThisSegment = useRef<boolean>(false);
 
+    const footstepAudio = useRef<HTMLAudioElement[]>([]);
+    const hasStepped = useRef<boolean>(false);
+
+
+
     useEffect(() => {
         playerRoot.set(camera.position.x, FEAR_SETTINGS.PLAYER_HEIGHT, camera.position.z);
+        footstepAudio.current = Array.from({ length: 6 }, (_, i) => {
+            const audio = new Audio(`fear/snd/footstep${i + 1}.mp3`);
+            audio.volume = 0.4;
+            return audio;
+        });
     }, []);
 
+    const playRandomFootstep = () => {
+        if (footstepAudio.current.length === 0) return;
+
+        const randomIndex = Math.floor(Math.random() * footstepAudio.current.length);
+        const audio = footstepAudio.current[randomIndex];
+
+        audio.currentTime = 0;
+        audio.play().catch((err) => {
+            console.warn("Footstep playback blocked by browser autocomplete/interaction rules.", err);
+        });
+    };
+
     useFrame((state, delta) => {
         const dt = Math.min(delta, 0.1);
 
@@ -73,7 +95,7 @@ export default function Player() {
         if (moveForward !== 0) targetVelocity.addScaledVector(forward, moveForward);
         if (moveSide !== 0) targetVelocity.addScaledVector(side, moveSide);
 
-        if (targetVelocity.lengthSq() > 0) 
+        if (targetVelocity.lengthSq() > 0)
             targetVelocity.normalize().multiplyScalar(FEAR_SETTINGS.PLAYER_SPEED);
 
         currentVelocity.lerp(targetVelocity, 10 * dt);
@@ -86,15 +108,25 @@ export default function Player() {
         playerRoot.x = THREE.MathUtils.clamp(playerRoot.x, minX, maxX);
 
         const isMoving = controls.Forward || controls.Backward || controls.Left || controls.Right;
-        
+
         bobIntensity.current = THREE.MathUtils.lerp(bobIntensity.current, isMoving ? 1 : 0, 8 * dt);
-        
+
-        if (isMoving) 
+        if (isMoving)
             movementCounter.current += dt * 12;
 
-        const moveBobY = Math.sin(movementCounter.current) * 0.06 * bobIntensity.current;
+        const sinWave = Math.sin(movementCounter.current);
+        const moveBobY = sinWave * 0.06 * bobIntensity.current;
         const moveBobX = Math.cos(movementCounter.current / 2) * 0.04 * bobIntensity.current;
 
+        if (isMoving && sinWave < -0.9) {
+            if (!hasStepped.current) {
+                playRandomFootstep();
+                hasStepped.current = true;
+            }
+        } else if (sinWave > 0) {
+            hasStepped.current = false;
+        }
+
         const breatheTime = state.clock.elapsedTime * 1.8;
         const breatheBobY = Math.sin(breatheTime) * 0.03 * (1 - bobIntensity.current * 0.5);
 
@@ -113,13 +145,13 @@ export default function Player() {
             flashlightRef.current.target.position.lerp(targetDest, 12 * dt);
             flashlightRef.current.target.updateMatrixWorld();
 
-            flashlightRef.current.intensity = 
+            flashlightRef.current.intensity =
-                FEAR_SETTINGS.FLASHLIGHT_INTENSITY_BASE + 
+                FEAR_SETTINGS.FLASHLIGHT_INTENSITY_BASE +
                 Math.sin(state.clock.elapsedTime * 30) * 0.15 * Math.cos(state.clock.elapsedTime * 3);
         }
 
         const length = FEAR_SETTINGS.HALLWAY_LENGTH;
-        const absoluteZ = -playerRoot.z; 
+        const absoluteZ = -playerRoot.z;
         const rawSegmentIndex = Math.floor(absoluteZ / length);
         const progressZ = ((absoluteZ % length) + length) % length / length;