gradually moving an object up to speed rather then instantly?

@IJM

Dude, you are a legend sir. I spend Days trying to get this to work with a script 3 pages long and still pulling out hair. Your solution was in Java i converted into c# and it worked marvelously. Thank you. here is what worked for me in C#

using UnityEngine; using System.Collections;

public class test2 : MonoBehaviour { public Vector3 position; float Speed = 0; //Don't touch this float MaxSpeed = 10; //This is the maximum speed that the object will achieve float Acceleration = 10; //How fast will object reach a maximum speed float Deceleration = 10; //How fast will object reach a speed of 0 // Use this for initialization void Start() { transform.position = position; }

 // Update is called once per frame
 void Update()
 {

     if ((Input.GetKey("left")) && (Speed < MaxSpeed)) Speed = Speed - Acceleration * Time.deltaTime;
     else if ((Input.GetKey("right")) && (Speed > -MaxSpeed)) Speed = Speed + Acceleration * Time.deltaTime;
     else
     {
         if (Speed > Deceleration * Time.deltaTime) Speed = Speed - Deceleration * Time.deltaTime;
         else if (Speed < -Deceleration * Time.deltaTime) Speed = Speed + Deceleration * Time.deltaTime;
         else
             Speed = 0;
     }
     position.x = transform.position.x + Speed * Time.deltaTime;
     transform.position = position;

 }

}

Try lerping it, here is the documentation:

transform.position = Vector3.Lerp(start.position, end.position, Time.time);

This gradually moves between two points. The movement is constant over time, to have the movement gradual (like building momentum) at the start and stop points I believe you must call lerp with the current position like so:

transform.position = Vector3.Lerp(transform.position, end.position, Time.time);

Yes, actually just look at the second example on that link. :-). Duh.

For 2D platformer movement with some acceleration and deceleration...

  void Update()
     {
         float h = Input.GetAxis("Horizontal");

         Rigidbody2D rbody = GetComponent<Rigidbody2D>();

           rbody.velocity = Vector3.right * h * speed; 
     }

 public float speed = 0f; 
 public float maxSpeed = 10f;
 public float forceMagnitude = 2f;
 
 void FixedUpdate() {
         // Store the input axes.
         float h = Input.GetAxisRaw("Horizontal");
         float v = Input.GetAxisRaw("Vertical");
 
         // Move the player around the scene.
         Move (h, v);
 
         //other stuff...
     }
 
 void Move(float h, float v) {
         if (v != 0 || h != 0) {
             // Set the movement vector based on the axis input.
             movement.Set (h, 0f, v);
             speed = Mathf.Min(speed + forceMagnitude * Time.deltaTime, maxSpeed);
         } else {
             speed = Mathf.Max(speed - forceMagnitude * Time.deltaTime * 1.5f, 0);
         }
         //Debug.Log (speed);
 
         // Normalise the movement vector and make it proportional to the speed per second.
         movement = movement.normalized * speed * Time.deltaTime;
         // Move the player to it's current position plus the movement.
         playerRigidbody.MovePosition(transform.position + movement);
     }