PrincessLandVR/Assets/ShelloController.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class ShelloController : MonoBehaviour
{
    public LayerMask terainMask;
    public float notice_distance;
    
	// Angular speed in radians per sec.
    public float rotationSpeed = 1.0f;
    public float excitedDirection = 5;

    Transform player;
    Animator anim;
    bool isAwake = false;
    int awokenFrames = 0;

    void Start()
    {
        anim = GetComponent<Animator>();
        var players = GameObject.FindGameObjectsWithTag("Player");
        if (players?.Length > 0)
        {
            player = players[0].transform;
        }
    }

    // Update is called once per frame
    void Update()
    {
        if (player == null)
        {
            return;
        }

        if (isAwake)
        {
            return;
        }

        float dist = Vector3.Distance(player.position, transform.position);
        var isExcited = dist < notice_distance;

        if (!isExcited)
        {
            return;
        }

        // Determine which direction to rotate towards  
        Vector3 targetDirection = player.position - transform.position;

        // The step size is equal to speed times frame time.
        float singleStep = rotationSpeed * Time.deltaTime;

        // Rotate the forward vector towards the target direction by one step
        Vector3 newDirection = Vector3.RotateTowards(transform.forward, targetDirection, singleStep, 0.0f);

        // Draw a ray pointing at our target in
        Debug.DrawRay(transform.position, newDirection, Color.red);

        var rotateDiff = transform.forward.y - targetDirection.y;

        // Calculate a rotation a step closer to the target and applies rotation to this object
        transform.rotation = Quaternion.LookRotation(newDirection);

        if (Mathf.Abs(rotateDiff) < excitedDirection)
        {
            anim.SetBool("isExcited", isExcited);
            if (isExcited)
            {
                awokenFrames++;
                if (awokenFrames > 60)
                {
                    anim.SetBool("isWalking", true);
                    anim.SetBool("isExcited", false);
                    isAwake = true;
                }
            }
        }
        else
        {
            Debug.Log($"Rotation diff: {rotateDiff}");
        }
    }

    void FixedUpdate()
    {
        Align();
    }

    private void Align()
    {
        RaycastHit hit;
        var theRay = -transform.up;

        if (Physics.Raycast(new Vector3(transform.position.x, transform.position.y, transform.position.z),
            theRay, out hit, 20, terainMask))
        {
            Quaternion targetRotation = Quaternion.FromToRotation(transform.up, hit.normal) * transform.parent.rotation;

            transform.rotation = Quaternion.Lerp(transform.rotation, targetRotation, Time.deltaTime / 0.15f);
            transform.position = new Vector3(transform.position.x, transform.position.y - hit.distance, transform.position.z);
        }
    }
}