# 【Unity】Object starts to chase the player approaching

## Overview

There is a sample the Cube Object starts to chase the player who goes in a certain area around it.

Unity 2020 1.1f1
Windows10

## Step1 : Set the player

Ethan from the Standard Assets can be used as a human object. Flowwing article explains how to set Ethan and move him.

After place Ethan on Terrian, set the Tag in inspector “Player”.

Adding rigidbody and capusule collider is needed.

## Step:2 Cube Object chasing player

Next, Set 3D Object Cube.

GameObject > 3D Object Cube

Adding Character Controller and Sphere Collider to the Cube Object.

Character Controller is useful to moving Cube. The parameters as Default is OK.

Shpere Collider can be used to detect Player is in certain area. Is Trigger should be checked.

## Step : 3 Script

Following script can realize Cube to chase player when he goes into cube area. Please attach this script.

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

public class Approach : MonoBehaviour
{

CharacterController Controller;
Transform Target;
GameObject Player;

[SerializeField]
float MoveSpeed = 2.0f;
int DetecDist = 8;
bool InArea = false;

// Use this for initialization
void Start()
{

// Get GameObject of Player by Tag
Player = GameObject.FindWithTag("Player");
Target = Player.transform;

Controller = GetComponent<CharacterController>();

}

// Update is called once per frame
void Update()
{

if (InArea)
{
// Look at Player
this.transform.LookAt(Target.transform);

// Getting direction from Cube object to Player
Vector3 direction = Target.position - this.transform.position;
direction = direction.normalized;

// Velocity toward Player
Vector3 velocity = direction * MoveSpeed;

// Making y velocity 0 to avoid cube from floating toward y axis
velocity.y = 0.0f;

// Move cube
Controller.Move(velocity * Time.deltaTime);
}

//Calculation of distance between the target object and this object
Vector3 Apos = this.transform.position;
Vector3 Bpos = Target.transform.position;
float distance = Vector3.Distance(Apos, Bpos);

// when distance between cube and player, cube stops tracing.
if (distance > DetecDist)
{
InArea = false;
}
}

// Player gets inside area of cube.
private void OnTriggerEnter(Collider other)
{
InArea = true;
}

}


## Step : 4 Test

Please start game and check of them. You may see the pictures like gif animation at top of this page.

How to fix AnimationEvent ‘Hit’ on animation ‘Attack1’ has no receiver! in Unity

Contents1 Overview2 Environments3 When error happened4 How to fix4.1 Copy the Animation4.2 Deleting ‘Hit’ Event4.3 Test Overview When we got free Animation at Unity Asset Store and used it with SimpleAnimation, I encountered following error. AnimationEvent ‘Hit’ on animation ‘Attack1’ has no receiver! Are you missing a component? To come to the point, the error could be fixed by deleting Animation Event from the Inspector. The following shows how to fix it step by step. Environments Windows10Unity 2020.1.f1 When error happened We used two packages, Robot Kyle from the Unity Technologies and WARRIOR PACK BUNDLE 3 FREE Animation from Explosive …

【Unity】The way to fix error CS0619:’GUIText’ is obsolete:’GUIText has been removed. Use UI.Text instead.’

Contents1 Overview2 Environment3 Occurences4 The way to fix it Overview There occured error CS0619:’GUIText’ is obsolete:’GUIText has been removed. Use UI.Text instead.’ to use Standard Assets. This article shows a way to fix it. Environment Unity 2019.4.3f1 Occurences Making C# script from Assets > Create > C# Script . Attaching the script to Sphere object by drag & drop, I get message ‘Can’t add script’ . This massage warns that the name of the script is different from its class name or there are some error of compiling. But I don’t find any error for compiling or the difference of …