FindingClosestObject

Author: Lars-Erik Jakobsson (save)

Description

This script illustrates how to find the closest transform to another transform. Commonly used to check which object is closest to the player. Should be ready to go for mobile devices too.

Usage

Name this script ClosestCollider.js and assign it to the player transform. From Inspector tweak the radius, masked layers and update frequency.

JavaScript - ClosestCollider.js

#pragma strict#pragma downcastimport System; /*    ClosestCollider.js    Description: Finding closest collider without using a pool    Last updated: 2012-12-28    Author: save*/ var sphereRadius : float = 10.0; //Radius of the OverlapSpherevar sphereMask : LayerMask; //What layers the OverlapSphere seesvar updateFrequency : float = 1.0; //Update frequency of FindClosestCollider-function private var cachedUF : float; //Cached value of updateFrequencystatic var pTransform : Transform; //Cache the Player Transform function Start () {    pTransform = transform;    RestartInvokeRepeating();} //Finding the closest colliderfunction FindClosestCollider () {    if (updateFrequency!=cachedUF) RestartInvokeRepeating();    var pSphere : Collider[] = Physics.OverlapSphere(pTransform.position, sphereRadius, sphereMask);    if (pSphere==null||pSphere.Length==0) return;    System.Array.Sort(pSphere, new PositionSorter());    DoSomethingWithClosestTransform(pSphere[0].transform);} //Do something with the closest transform, for instance print its name in Consolefunction DoSomethingWithClosestTransform (t : Transform) {    Debug.Log(t.name);} //This is just a fancy extra if you want to update the frequency in play modefunction RestartInvokeRepeating () {    updateFrequency = Mathf.Clamp(updateFrequency, .01, 10.0);    CancelInvoke("FindClosestCollider");    InvokeRepeating("FindClosestCollider", .0, updateFrequency);    cachedUF = updateFrequency;}  //Sort the closest transformclass PositionSorter implements IComparer {    function Compare(a : System.Object, b : System.Object) : int {        if ( !(a instanceof Collider) || !(b instanceof Collider)) return;        var posA : Collider = a;        var posB : Collider = b;        return (ClosestCollider.pTransform.position-posA.transform.position).magnitude.CompareTo((ClosestCollider.pTransform.position-posB.transform.position).magnitude);    }}