简单的玩家预制体和脚本

Assets/_Game/Scripts/MouseLook.cs

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+using UnityEngine;
+using UnityEngine.InputSystem;
+
+namespace Agame
+{
+    public class MouseLook : MonoBehaviour
+    {
+        [Header("Sensitivity")]
+        [Tooltip("Degrees of rotation per pixel of mouse movement.")]
+        public float mouseSensitivity = 0.12f;
+
+        [Header("Vertical Clamp")]
+        public float minLookAngle = -80f;
+        public float maxLookAngle = 80f;
+
+        [Header("References")]
+        public Transform characterBody;
+
+        private float xRotation = 0f;
+
+        private void Start()
+        {
+            LockCursor(true);
+        }
+
+        private void Update()
+        {
+            var kb = Keyboard.current;
+            var mouse = Mouse.current;
+            if (mouse == null)
+            {
+                return;
+            }
+
+            // Esc releases the cursor, left click grabs it again (editor-friendly)
+            if (kb != null && kb.escapeKey.wasPressedThisFrame)
+            {
+                LockCursor(false);
+            }
+            if (mouse.leftButton.wasPressedThisFrame && Cursor.lockState != CursorLockMode.Locked)
+            {
+                LockCursor(true);
+            }
+
+            if (Cursor.lockState != CursorLockMode.Locked)
+            {
+                return;
+            }
+
+            // Mouse delta is in pixels for the new Input System
+            Vector2 delta = mouse.delta.ReadValue();
+            float mouseX = delta.x * mouseSensitivity;
+            float mouseY = delta.y * mouseSensitivity;
+
+            // Yaw the body left/right
+            if (characterBody != null)
+            {
+                characterBody.Rotate(Vector3.up * mouseX);
+            }
+
+            // Pitch the camera up/down
+            xRotation -= mouseY;
+            xRotation = Mathf.Clamp(xRotation, minLookAngle, maxLookAngle);
+            transform.localRotation = Quaternion.Euler(xRotation, 0f, 0f);
+        }
+
+        private void LockCursor(bool locked)
+        {
+            Cursor.lockState = locked ? CursorLockMode.Locked : CursorLockMode.None;
+            Cursor.visible = !locked;
+        }
+    }
+}

Assets/_Game/Scripts/MouseLook.cs.meta

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+fileFormatVersion: 2
+guid: ca68f61e4f5bf6b439395d4aa1b7334a

Assets/_Game/Scripts/PlayerController.cs

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+using UnityEngine;
+using UnityEngine.InputSystem;
+
+namespace Agame
+{
+    [RequireComponent(typeof(CharacterController))]
+    public class PlayerController : MonoBehaviour
+    {
+        [Header("Movement")]
+        public float moveSpeed = 5f;
+        public float sprintSpeed = 8f;
+        public float gravity = -20f;
+        public float jumpHeight = 1.5f;
+
+        private CharacterController controller;
+        private Vector3 velocity;
+        private bool isGrounded;
+
+        private void Awake()
+        {
+            controller = GetComponent<CharacterController>();
+        }
+
+        private void Update()
+        {
+            var kb = Keyboard.current;
+            if (kb == null)
+            {
+                return;
+            }
+
+            isGrounded = controller.isGrounded;
+            if (isGrounded && velocity.y < 0f)
+            {
+                velocity.y = -2f;
+            }
+
+            // WASD input
+            float moveX = 0f;
+            float moveZ = 0f;
+            if (kb.aKey.isPressed) moveX -= 1f;
+            if (kb.dKey.isPressed) moveX += 1f;
+            if (kb.sKey.isPressed) moveZ -= 1f;
+            if (kb.wKey.isPressed) moveZ += 1f;
+
+            // Move relative to the capsule's own facing (which MouseLook rotates)
+            Vector3 move = transform.right * moveX + transform.forward * moveZ;
+            move = Vector3.ClampMagnitude(move, 1f);
+
+            float speed = kb.leftShiftKey.isPressed ? sprintSpeed : moveSpeed;
+            controller.Move(move * speed * Time.deltaTime);
+
+            // Jump
+            if (kb.spaceKey.wasPressedThisFrame && isGrounded)
+            {
+                velocity.y = Mathf.Sqrt(jumpHeight * -2f * gravity);
+            }
+
+            // Gravity
+            velocity.y += gravity * Time.deltaTime;
+            controller.Move(velocity * Time.deltaTime);
+        }
+    }
+}

Assets/_Game/Scripts/PlayerController.cs.meta

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+fileFormatVersion: 2
+guid: b6780c1c0b9d27c46a0bd43f0d2291f6