Keep a rolling balls momentum

Questions & Answers
1

I am doing an infinite runner, the idea is to have a ball that is constantly rolling using AddRelativeTorque but I’m having a problem when it collides into the platforms. It kills the momentum and it needs to be built up again.

See the picture below, my ball has just hit the platform above it and now wont make it to the next platform, resulting in game over.

31904-capture.png

Is there a way I can hit the platform without losing the speed of the ball?

Here is my code:

using UnityEngine;
using System.Collections;

public class platform : MonoBehaviour 
{
	public Rigidbody target;
	public float speed = 5f;
	public int jumpHeight = 6;
	public bool isFalling = false;
	private bool isJumping = false;

	// Update is called once per frame
	void Update () 
	{
		if(Input.GetKeyDown(KeyCode.R))
		{
			Application.LoadLevel(0);
		}
		
		if(Input.GetButtonDown("Fire1") && isFalling == false)
			isJumping = true;

	}
	
	// Update is called once per frame
	void FixedUpdate () 
	{
		ballMovements ();   
	}
	
	void ballMovements()
	{
		rigidbody.AddRelativeTorque(Vector3.right * -1 * speed);

		//transform.Translate(1f * Time.deltaTime, 0f, 0f);
		
		if( isJumping )
		{

			isJumping = false;
			Debug.Log ("clicked");
			Vector3 temp = rigidbody.velocity;
			temp.y = jumpHeight;
			rigidbody.velocity = temp;

		}
		isFalling = true;
	}
	
	void OnCollisionStay()
	{
		isFalling = false;
	}
}
2

You can play directly with the sideways motion, like your current code does for jumping. Suppose you want to have a minimum sideways speed of 1M/S:

Vector3 v = rigidbody.velocity;
if(v.x<1) v.x=1;
rigidbody.velocity=v;

In theory, this would be in FixedUpdate, to be sure it resets speed before each move. But in Update would probably be fine.

Of course, you can have all sorts of fancy programming in the middle. Say you want it to bounce backwards, but then always climb some more. Remember it’s furthest progress, when it hits something new, set a 1-second counter; and if it’s past the time and in “old” territory, force (or smooth) the speed to 1.