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);
 
@@ -92,9 +114,19 @@ export default function Player() {
         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);