Adding Double Jump in Unity Game

In this tutorial, we will cover how to implement a double jump mechanic in a Unity game. Double jumping can make your platformer or action game more dynamic and fun to play. We will provide a step-by-step guide along with code examples to help you integrate this feature smoothly.

Setting Up the Environment

Before we start coding, make sure you have the following set up in your Unity project:

• A player character with a Rigidbody and Collider.
• A ground object with a specific tag (e.g., "Ground").

Creating the Double Jump Script

Create a new C# script named PlayerDoubleJump and attach it to your player character. This script will handle the detection and execution of the double jump.

using UnityEngine;

public class PlayerDoubleJump : MonoBehaviour
{
    public float jumpForce = 7.0f;
    private int jumpCount = 0;
    private bool isGrounded = false;
    private Rigidbody rb;

    void Start()
    {
        rb = GetComponent();
    }

    void Update()
    {
        if (isGrounded && Input.GetButtonDown("Jump"))
        {
            Jump();
        }
        else if (!isGrounded && jumpCount < 2 && Input.GetButtonDown("Jump"))
        {
            Jump();
        }
    }

    private void OnCollisionEnter(Collision collision)
    {
        if (collision.gameObject.CompareTag("Ground"))
        {
            isGrounded = true;
            jumpCount = 0;
        }
    }

    private void OnCollisionExit(Collision collision)
    {
        if (collision.gameObject.CompareTag("Ground"))
        {
            isGrounded = false;
        }
    }

    private void Jump()
    {
        rb.velocity = new Vector3(rb.velocity.x, jumpForce, rb.velocity.z);
        jumpCount++;
    }
}

Explaining the Code

Here's a breakdown of what each part of the script does:

1. Variables:jumpForce controls the force of the jump, jumpCount tracks the number of jumps, isGrounded checks if the player is on the ground, and rb references the player's Rigidbody.
2. Start Method: Initializes the Rigidbody reference.
3. Update Method: Checks for jump input. If the player is grounded, it allows a jump. If the player is not grounded and has not double-jumped, it allows a second jump.
4. OnCollisionEnter Method: Detects when the player collides with the ground and resets the jump count and grounded status.
5. OnCollisionExit Method: Detects when the player leaves the ground and updates the grounded status.
6. Jump Method: Executes the jump by applying a vertical force and increments the jump count.

Testing the Double Jump Mechanic

After implementing the script, test the double jump mechanic by pressing the jump button (usually Spacebar) while the player is on the ground and in mid-air. The player should be able to jump twice before needing to touch the ground again.

Conclusion

Adding a double jump mechanic to your Unity game can significantly enhance the gameplay experience. With this tutorial, you now have a basic double jump script that you can further customize and expand upon. Experiment with different jump forces, animations, and additional features to make your double jump system more robust and engaging.