Add first-person camera mode with pose-aware eye offset and yaw facing

Introduce a FirstPersonController / FirstPersonMode pair (mirroring the
free-cam mode) wired into the GameModeManager Tab cycle. In first person the
mesh is hidden, the eye sits on CameraTarget plus a per-pose
firstPersonCameraTargetYOffset, and the character body yaw is driven to match
the camera via a new single-writer FaceYaw hook on PlayerCharacterController.

Also includes user content edits (poses, prefabs, scene) carried along.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

Assets/Scripts/FirstPersonController.cs

@@ -0,0 +1,214 @@
+using UnityEngine;
+using Unity.Cinemachine;
+#if ENABLE_INPUT_SYSTEM
+using UnityEngine.InputSystem;
+#endif
+
+/// <summary>
+/// First-person camera. Drives its OWN dedicated <see cref="CinemachineCamera"/>: each frame it snaps
+/// to the player's <c>CameraTarget</c> (the same point the ThirdPersonCamera tracks) for position and
+/// applies free mouse-look (yaw/pitch) for rotation. While active the player's mesh is hidden so the
+/// body isn't seen from the inside. Movement stays with the player controller, which reads the
+/// brain-driven Main Camera forward, so WASD is automatically relative to this view.
+///
+/// Activation is driven by <see cref="FirstPersonMode"/> via <see cref="SetActive"/>: it raises the
+/// vcam priority so the CinemachineBrain blends to it, snaps look to the current view (no jump), hides
+/// the mesh and locks the cursor. While inactive the vcam rests at a low priority and this component
+/// does nothing.
+/// </summary>
+[RequireComponent(typeof(CinemachineCamera))]
+[DisallowMultipleComponent]
+public class FirstPersonController : MonoBehaviour
+{
+    [Header("Target")]
+    [Tooltip("Eye position the camera sits at (the player's CameraTarget). Empty = auto-resolved from the player's \"CameraTarget\" child.")]
+    public Transform cameraTarget;
+
+    [Tooltip("Renderers hidden while first-person is active (so you don't see your own body). Empty = the player's SkinnedMeshRenderers, auto-resolved.")]
+    public Renderer[] hiddenRenderers;
+
+    [Header("Look")]
+    [Tooltip("Horizontal look sensitivity (degrees of yaw per pixel).")]
+    public float horizontalSensitivity = 0.2f;
+
+    [Tooltip("Vertical look sensitivity (degrees of pitch per pixel).")]
+    public float verticalSensitivity = 0.15f;
+
+    [Tooltip("Invert vertical look (mouse up tilts the camera down).")]
+    public bool invertY = false;
+
+    [Tooltip("Pitch is clamped to +/- this angle (degrees) so the camera never flips over.")]
+    [Range(1f, 89.9f)]
+    public float maxPitch = 89f;
+
+    [Header("Smoothing")]
+    [Tooltip("Look smoothing, in seconds. 0 = raw mouse (instant); small values take the edge off jitter without feeling laggy.")]
+    [Range(0f, 0.3f)]
+    public float lookSmoothTime = 0.04f;
+
+    [Header("Camera")]
+    [Tooltip("Priority the dedicated CinemachineCamera takes while active (must beat the gameplay camera).")]
+    public int activePriority = 100;
+
+    [Tooltip("Priority the dedicated CinemachineCamera rests at while inactive (must lose to the gameplay camera).")]
+    public int inactivePriority = -100;
+
+    CinemachineCamera _vcam;
+    PlayerCharacterController _player;     // body whose yaw we pin to the camera while active
+    PlayerPoseController _poseController; // supplies the active pose's per-pose first-person eye offset
+    float _yaw;     // look target (raw input accumulates here)
+    float _pitch;
+    float _displayYaw;   // smoothed value actually applied to the transform
+    float _displayPitch;
+    float _yawSmoothRef;
+    float _pitchSmoothRef;
+    bool _resolved;
+
+    void Awake()
+    {
+        _vcam = GetComponent<CinemachineCamera>();
+        if (!_vcam)
+            Debug.LogError("[FirstPersonController] No CinemachineCamera on this GameObject; first-person cannot go live.", this);
+        else
+            _vcam.Priority = inactivePriority;
+
+        ResolveReferences();
+
+        // Dormant until FirstPersonMode enters; nothing reads input or moves the rig meanwhile.
+        enabled = false;
+    }
+
+    /// <summary>Enter/leave first-person. Raises/lowers the vcam priority, hides the player mesh, snaps
+    /// look to the live view and manages the cursor. Called by <see cref="FirstPersonMode"/>.</summary>
+    public void SetActive(bool active)
+    {
+        if (_vcam)
+            _vcam.Priority = active ? activePriority : inactivePriority;
+
+        SetMeshHidden(active);
+
+        if (active)
+        {
+            SyncToCurrentView();
+            SetCursorLocked(true);
+            ApplyTransform();   // place at the eye on the same frame so the blend starts from there
+            if (_player) _player.FaceYaw = _displayYaw; // body faces the camera from frame one
+        }
+        else
+        {
+            SetCursorLocked(false);
+            if (_player) _player.FaceYaw = null;        // restore movement-facing
+        }
+
+        enabled = active;
+    }
+
+    void LateUpdate()
+    {
+        // LateUpdate so the player has already moved the CameraTarget this frame.
+        LookTick();
+        ApplyTransform();
+        if (_player) _player.FaceYaw = _displayYaw; // keep the body's yaw locked to the camera
+    }
+
+    void LookTick()
+    {
+        Vector2 delta = ReadMouseDelta();
+        _yaw += delta.x * horizontalSensitivity;
+        float vs = verticalSensitivity * (invertY ? 1f : -1f);
+        _pitch = Mathf.Clamp(_pitch + delta.y * vs, -maxPitch, maxPitch);
+
+        if (lookSmoothTime > 0f)
+        {
+            // SmoothDampAngle is frame-rate-independent and wraps yaw correctly.
+            _displayYaw = Mathf.SmoothDampAngle(_displayYaw, _yaw, ref _yawSmoothRef, lookSmoothTime);
+            _displayPitch = Mathf.SmoothDampAngle(_displayPitch, _pitch, ref _pitchSmoothRef, lookSmoothTime);
+        }
+        else
+        {
+            _displayYaw = _yaw;
+            _displayPitch = _pitch;
+        }
+    }
+
+    void ApplyTransform()
+    {
+        Quaternion rot = Quaternion.Euler(_displayPitch, _displayYaw, 0f);
+        if (cameraTarget)
+        {
+            // Sit at the shared camera target, then raise/lower the eye by the active pose's first-person
+            // offset. TransformVector keeps it in the target's local up and scales with the player (so it
+            // tracks PlayerScaler), without disturbing the target the ThirdPersonCamera shares.
+            Vector3 pos = cameraTarget.position;
+            float offset = _poseController ? _poseController.FirstPersonCameraYOffset : 0f;
+            if (offset != 0f)
+                pos += cameraTarget.TransformVector(Vector3.up * offset);
+            transform.SetPositionAndRotation(pos, rot);
+        }
+        else
+            transform.rotation = rot;
+    }
+
+    /// <summary>Seed look from the currently rendered view so going live produces no visible jump.</summary>
+    void SyncToCurrentView()
+    {
+        var cam = Camera.main;
+        if (cam)
+        {
+            Vector3 e = cam.transform.rotation.eulerAngles;
+            _yaw = e.y;
+            float p = e.x > 180f ? e.x - 360f : e.x;
+            _pitch = Mathf.Clamp(p, -maxPitch, maxPitch);
+        }
+
+        // Snap the smoothed state to the fresh pose so entering never lags/jumps to catch up.
+        _displayYaw = _yaw;
+        _displayPitch = _pitch;
+        _yawSmoothRef = 0f;
+        _pitchSmoothRef = 0f;
+    }
+
+    void SetMeshHidden(bool hidden)
+    {
+        if (hiddenRenderers == null) return;
+        foreach (var r in hiddenRenderers)
+            if (r) r.enabled = !hidden;
+    }
+
+    void ResolveReferences()
+    {
+        if (_resolved) return;
+        _resolved = true;
+
+        var player = FindFirstObjectByType<PlayerCharacterController>(FindObjectsInactive.Include);
+        if (!player) return;
+        _player = player;
+
+        if (!_poseController)
+            _poseController = player.GetComponent<PlayerPoseController>();
+
+        if (!cameraTarget)
+        {
+            Transform t = player.transform.Find("CameraTarget");
+            if (t) cameraTarget = t;
+        }
+
+        if (hiddenRenderers == null || hiddenRenderers.Length == 0)
+            hiddenRenderers = player.GetComponentsInChildren<SkinnedMeshRenderer>(true);
+    }
+
+    Vector2 ReadMouseDelta()
+    {
+#if ENABLE_INPUT_SYSTEM
+        return Mouse.current != null ? Mouse.current.delta.ReadValue() : Vector2.zero;
+#else
+        return new Vector2(Input.GetAxisRaw("Mouse X"), Input.GetAxisRaw("Mouse Y")) * 10f;
+#endif
+    }
+
+    static void SetCursorLocked(bool locked)
+    {
+        Cursor.lockState = locked ? CursorLockMode.Locked : CursorLockMode.None;
+        Cursor.visible = !locked;
+    }
+}