Unity Enemy Shooting Ai & Animation | How to make Enemy Attack Player in Unity 3D Game Course 2022

Introduction

In this tutorial, we will learn how to implement enemy shooting AI and animation in Unity 3D. This step-by-step guide is part of a broader course on game development, aimed at helping you create your own 3D games using Unity. By the end of this tutorial, you will understand how to make enemies attack the player, enhancing the gameplay experience.

Step 1: Setting Up the Enemy Character

• Create the Enemy GameObject

  • In Unity, right-click in the Hierarchy panel and select Create Empty.
  • Name the GameObject (e.g., "Enemy").

• Add Components

  • Select the Enemy GameObject and add the necessary components:
    • Rigidbody: For physics interactions.
    • Collider: To detect collisions with the player.

• Import Enemy Model

  • Drag and drop your enemy model into the scene.
  • Position the model under the Enemy GameObject.

Step 2: Implementing Enemy AI Behavior

• Create an AI Script

  • In the Project panel, right-click and select Create > C# Script. Name it "EnemyAI".

• Define Variables

  • Open the script and define necessary variables:

    public class EnemyAI : MonoBehaviour
    {
        public Transform player;
        public float attackRange = 10f;
        public float shootingCooldown = 1f;
        private float lastShotTime;
    }
    

• Detect Player

  • In the Update method, check the distance to the player:

    void Update()
    {
        float distance = Vector3.Distance(transform.position, player.position);
        if (distance <= attackRange)
        {
            Shoot();
        }
    }
    

Step 3: Implementing Shooting Logic

• Create a Shooting Function

  • Add the following code to handle shooting:

    void Shoot()
    {
        if (Time.time >= lastShotTime + shootingCooldown)
        {
            // Instantiate bullet and shoot
            lastShotTime = Time.time;
        }
    }
    

• Bullet Prefab

  • Create a bullet prefab in Unity:
    • Right-click in the Project panel, select Create > Prefab.
    • Configure the bullet's Rigidbody and Collider.

• Instantiate Bullet

  • Modify the Shoot function to instantiate the bullet:

    GameObject bullet = Instantiate(bulletPrefab, transform.position, Quaternion.identity);
    // Add force to bullet to shoot
    

Step 4: Adding Animation

• Import Animation Clips

  • Import your animation clips for the enemy (e.g., idle, attack).

• Set Up Animator

  • Add an Animator component to the Enemy GameObject.
  • Create an Animator Controller and assign it to the Animator.

• Create Animation States

  • Open the Animator window and create states for idle and attack.
  • Set transitions between these states based on conditions (e.g., isAttacking).

Step 5: Testing the AI

• Attach the Script

  • Drag the EnemyAI script onto the Enemy GameObject.
  • Assign the player GameObject to the player variable in the Inspector.

• Run the Game

  • Click the Play button to test the enemy AI.
  • Observe how the enemy detects and shoots at the player.

Conclusion

You have successfully implemented enemy shooting AI and animation in Unity 3D. Key takeaways include setting up the enemy character, defining AI behavior, creating shooting logic, and adding animation. As a next step, consider refining the enemy's shooting mechanics, adding sound effects, or enhancing the AI with more complex behaviors. Keep practicing to become a more proficient game developer!