Unity 6.3 LTS｜3D的当てゲームを作ろう⑩ Rigidbodyでジャンプし、PlayerをPrefab化しよう

using UnityEngine;
using UnityEngine.InputSystem;

public class PlayerMove : MonoBehaviour
{
    public float moveSpeed = 4f;
    public float jumpForce = 6f;
    public float turnSpeed = 10f;

    public Animator animator;
    public Transform modelRoot;

    public Transform groundCheck;
    public float groundDistance = 0.25f;
    public LayerMask groundLayer;

    Rigidbody rb;
    Transform cameraTransform;

    Vector3 move;
    bool jumpRequested;
    bool isGrounded;

    void Start()
    {
        rb = GetComponent<Rigidbody>();
        cameraTransform = Camera.main.transform;
    }

    void Update()
    {
        float horizontal = 0f;
        float vertical = 0f;

        if (Keyboard.current != null)
        {
            if (Keyboard.current.aKey.isPressed)
            {
                horizontal -= 1f;
            }

            if (Keyboard.current.dKey.isPressed)
            {
                horizontal += 1f;
            }

            if (Keyboard.current.sKey.isPressed)
            {
                vertical -= 1f;
            }

            if (Keyboard.current.wKey.isPressed)
            {
                vertical += 1f;
            }
        }

        Vector3 forward = cameraTransform.forward;
        Vector3 right = cameraTransform.right;

        forward.y = 0f;
        right.y = 0f;
        forward.Normalize();
        right.Normalize();

        move =
            forward * vertical +
            right * horizontal;

        move = Vector3.ClampMagnitude(move, 1f);

        isGrounded = Physics.CheckSphere(
            groundCheck.position,
            groundDistance,
            groundLayer,
            QueryTriggerInteraction.Ignore);

        if (Keyboard.current != null &&
            Keyboard.current.spaceKey.wasPressedThisFrame &&
            isGrounded)
        {
            jumpRequested = true;
        }

        if (modelRoot != null &&
            move.sqrMagnitude > 0.01f)
        {
            Quaternion targetRotation =
                Quaternion.LookRotation(
                    move,
                    Vector3.up);

            modelRoot.rotation =
                Quaternion.Slerp(
                    modelRoot.rotation,
                    targetRotation,
                    turnSpeed * Time.deltaTime);
        }

        if (animator != null)
        {
            animator.SetFloat(
                "MoveSpeed",
                move.magnitude,
                0.1f,
                Time.deltaTime);

            animator.SetBool(
                "Grounded",
                isGrounded);
        }
    }

    void FixedUpdate()
    {
        Vector3 currentVelocity =
            rb.linearVelocity;

        rb.linearVelocity =
            new Vector3(
                move.x * moveSpeed,
                currentVelocity.y,
                move.z * moveSpeed);

        if (jumpRequested)
        {
            rb.AddForce(
                Vector3.up * jumpForce,
                ForceMode.Impulse);

            jumpRequested = false;
        }
    }

    void OnDrawGizmosSelected()
    {
        if (groundCheck == null)
        {
            return;
        }

        Gizmos.color =
            isGrounded ? Color.green : Color.red;

        Gizmos.DrawWireSphere(
            groundCheck.position,
            groundDistance);
    }
}