Unity 2D Change Sprite Color On Collision | Unity Tutorial
In this video tutorial, you'll learn how to change a 2D sprite's color in Unity when it collides with other game objects. We'll walk you through creating a simple script that detects collisions and updates the sprite's color based on the type of object it collides with. You'll discover how to use Unity's tag system to specify which objects trigger the color change and how to revert the sprite's color once the collision ends. This tutorial is perfect for adding visual feedback to your 2D games and enhancing the player experience with dynamic interactions.
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Script:
PlayerController.cs
using UnityEngine;
public class PlayerController : MonoBehaviour
{
public float moveSpeed = 5f;
public float jumpForce = 10f;
public Transform groundCheck;
public LayerMask groundLayer;
public float groundCheckRadius = 0.2f;
public Color originalColor = Color.white; // Public color for the original state
public Color collisionColor = Color.red; // Color to change to on collision
public string enemyTag = "Enemy"; // Tag to identify collision with enemies
private Rigidbody2D rb;
private Vector2 moveDirection;
private bool isGrounded;
private SpriteRenderer spriteRenderer;
private void Start()
{
rb = GetComponent<Rigidbody2D>();
spriteRenderer = GetComponent<SpriteRenderer>();
if (spriteRenderer != null)
{
// Set the sprite color to originalColor at the start
spriteRenderer.color = originalColor;
}
}
private void Update()
{
// Input handling
float moveX = Input.GetAxis("Horizontal");
moveDirection = new Vector2(moveX, 0).normalized;
// Check if player is on the ground
isGrounded = Physics2D.OverlapCircle(groundCheck.position, groundCheckRadius, groundLayer);
// Jump input
if (isGrounded && Input.GetButtonDown("Jump"))
{
rb.velocity = new Vector2(rb.velocity.x, jumpForce);
}
// Flip sprite based on movement direction
if (moveDirection.x != 0)
{
spriteRenderer.flipX = moveDirection.x < 0; // Flip sprite if moving left
}
}
private void FixedUpdate()
{
// Apply movement
rb.velocity = new Vector2(moveDirection.x * moveSpeed, rb.velocity.y);
}
private void OnCollisionEnter2D(Collision2D collision)
{
// Check if the collision is with an object that should change the color
if (spriteRenderer != null && collision.gameObject.CompareTag(enemyTag))
{
spriteRenderer.color = collisionColor;
}
}
private void OnCollisionExit2D(Collision2D collision)
{
// Revert to original color when not colliding
if (spriteRenderer != null && collision.gameObject.CompareTag(enemyTag))
{
spriteRenderer.color = originalColor;
}
}
}
