FindingClosestObject

转载于 2013-07-31 15:19:53 发布 · 688 阅读

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本文介绍了一个Unity脚本ClosestCollider.js，该脚本能够帮助开发者检测玩家周围最近的碰撞体。通过调整脚本参数如半径、图层掩码及更新频率，可以灵活应用于不同的游戏场景。

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 downcast
import 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 OverlapSphere
var sphereMask : LayerMask; //What layers the OverlapSphere sees
var updateFrequency : float = 1.0; //Update frequency of FindClosestCollider-function
 
private var cachedUF : float; //Cached value of updateFrequency
static var pTransform : Transform; //Cache the Player Transform
 
function Start () {
    pTransform = transform;
    RestartInvokeRepeating();
}
 
//Finding the closest collider
function 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 Console
function DoSomethingWithClosestTransform (t : Transform) {
    Debug.Log(t.name);
}
 
//This is just a fancy extra if you want to update the frequency in play mode
function RestartInvokeRepeating () {
    updateFrequency = Mathf.Clamp(updateFrequency, .01, 10.0);
    CancelInvoke("FindClosestCollider");
    InvokeRepeating("FindClosestCollider", .0, updateFrequency);
    cachedUF = updateFrequency;
}
 
 
//Sort the closest transform
class 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);
    }
}