Rolling Ball Forward

Unity Engine
1

Hi, im new to unity. I know how to make a script to make a gameobject move forward, turn, shoot, etc using the character controller thing. im making a game where a ball controlled by you collects stars or something. how do i make it so that the ball rolls forward in a realistic way?
thanks.:stuck_out_tongue:

2

AddForce() or AddConstantForce() should put you on the right track.

3

Cool! Something I can actually answer (sort of). Iā€™ve found that using the physics stuff is super easy:
rigidbody.AddForce (moveDirectionAsVector3)

Iā€™m not sure if torque would be ā€œmore realisticā€ since I donā€™t know if torque applied to a sphere sitting on a ā€œfloorā€ would actually calculate friction to cause the movement.

4

Hereā€™s a starter script where I roll a ball forward with W and backwards with S:

using UnityEngine;
using System.Collections;

public class SphereController : MonoBehaviour {
	
	public Transform target;
	public int speed = 5;
	
	// Use this for initialization
	void Start () {
	
	}
	
	// Update is called once per frame
	void Update () {
	
	}
	
	void FixedUpdate() {
		if ( Input.GetKey(KeyCode.W) ) {
			target.rigidbody.AddForce( Vector3.forward * speed );
		}	
		if ( Input.GetKey(KeyCode.S) ) {
			target.rigidbody.AddForce( Vector3.back * speed );
		}
			
	}
	
}

And the corresponding YouTube video: http://www.youtube.com/watch?v=XYG9iPPxX8M

Enjoy. :slight_smile:

5

thanks for the fast replys, ill try it out.

6

just a question: is the code you gave me javascript? or is it c# or boo?
im getting alot of errors D:

7

Itā€™s C#. What errors are you getting? Clearly, it runs fine for me. :slight_smile:

Before running it, in the Unity inspector youā€™ll need to drag and drop your sphere onto the target variable. The sphere must have a rigid body attached. Also, youā€™ll have to attach the script to a game object.

8

ok thanks. i was putting the code in a javascript file.

9

thanks! it works great!

10

Glad to hear it.