How to have an object stop incrementing speed after a certain value?,

Question

So I'm playing around with making a simple Pong game (with tutorials), and am trying to have it so the ball doesn't move any faster after a certain point (it gets a bit faster each time it hits a paddle). Because if it moves too fast it just goes right through the paddles. I had wanted to add a couple extra features to make it my own even though I'm still new with coding.

Any help is greatly appreciated!

 public class Ball : MonoBehaviour
 {
     public float speed = 200.0f;
     private Rigidbody2D _rigidbody;
 
     private void Awake()
     {
         _rigidbody = GetComponent<Rigidbody2D>();
     }
 
     private void Start ()
     {
         resetPosition();
         AddStartingForce();
     }
 
     public void resetPosition()
     {
         _rigidbody.position = Vector2.zero;
         _rigidbody.velocity = Vector2.zero;
     }
 
     public void AddStartingForce()
     {
         float x = Random.value < 0.5f ? -1.0f : 1.0f;
         float y = Random.value < 0.5f ? Random.Range(-1.0f, -0.5f) : Random.Range(0.5f, 1.0f);
 
         Vector2 direction = new Vector2(x, y);
         _rigidbody.AddForce(direction * this.speed);
     }
 
     public void AddForce(Vector2 force)
     {
         _rigidbody.AddForce(force);
     }
 
 }

Answer 1

Answer by swanne · Nov 02, 2021 at 03:57 PM

Apologies, I have done some testing and found my mistake.
On the ball use this

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

 public class Ball : MonoBehaviour
 {
 
     public float moveSpeed = 1f;
     public float maxSpeed = 4;
 
     Rigidbody rb;
 
     void Start()
     {
         rb = GetComponent<Rigidbody>();
         Move();
     }
 
     void Move()
     {
         rb.AddForce(Vector3.right * moveSpeed);
     }
 
     private void Update()
     {
         Debug.Log(rb.velocity.magnitude);
 
         
         if(rb.velocity.magnitude > maxSpeed)
         {
             rb.velocity = rb.velocity.normalized * maxSpeed;
         }
         
     }
 }

Then on each of the paddles use this:
using System.Collections; using System.Collections.Generic; using UnityEngine;

 public class Paddle : MonoBehaviour
 {
 
     Rigidbody rb;
     public float force = 50f;
 
     void OnCollisionEnter(Collision col)
     {
         if (col.gameObject.tag == "Ball") // Do not forget assign tag to the field
         {
             rb = col.gameObject.GetComponent<Rigidbody>();
             rb.AddForce(-transform.right * force);
         }
     }
 }

On the left paddle, enter a negative value and it'll make the ball travel right. eg. -300

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astericaewrites · Nov 02, 2021 at 08:07 PM 0

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I'm unfortunately getting an error though.. alt text

And this is what I added:

 public class Ball : MonoBehaviour
 {
   
     public float maxSpeed = 250.0f;
 
 
 
     private void FixedUpdate()
     {
         if (_rigidbody.velocity > maxSpeed)
         {
             _rigidbody.velocity = maxSpeed;
         }
     }
 
 }

swanne astericaewrites · Nov 02, 2021 at 08:49 PM 0

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Hey @astericaewrites

I made a short video to better explain my answer

https://youtu.be/IZsgpeNm-Ds

astericaewrites swanne · Nov 03, 2021 at 01:30 AM 0

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Thank you very much for all your help! It has been very useful :)

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How to have an object stop incrementing speed after a certain value?,

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