Vector3.MoveTowards
static function MoveTowards(current: Vector3, target: Vector3, maxDistanceDelta: float): Vector3;
static Vector3 MoveTowards(Vector3 current, Vector3 target, float maxDistanceDelta);
static def MoveTowards(current as Vector3, target as Vector3, maxDistanceDelta as float) as Vector3
Description

Moves a point current in a straight line towards a target point.

The value returned by this function is a point maxDistanceDelta units closer to a target point along a line between current and target. If the target is closer than maxDistanceDelta then the returned value will be equal to target (ie, the movement will not overshoot the target). Negative values of maxDistanceDelta can be used to push the point away from the target.
	// The target marker.
	var target: Transform;
	
	// Speed in units per sec.
	var speed: float;
	
	
	function Update () {
		// The step size is equal to speed times frame time.
		var step = speed * Time.deltaTime;
		
		// Move our position a step closer to the target.
		transform.position = Vector3.MoveTowards(transform.position, target.position, step);
	}
using UnityEngine;
using System.Collections;

public class Example : MonoBehaviour {
    public Transform target;
    public float speed;
    void Update() {
        float step = speed * Time.deltaTime;
        transform.position = Vector3.MoveTowards(transform.position, target.position, step);
    }
}
import UnityEngine
import System.Collections

public class Example(MonoBehaviour):

	public target as Transform

	public speed as float

	def Update() as void:
		step as float = (speed * Time.deltaTime)
		transform.position = Vector3.MoveTowards(transform.position, target.position, step)