Unity Collision教程 之 碰撞接触点的快速获取。本节介绍两个物体碰撞的接触点的获取的简单案例，具体如下
工具/原料
Unity
Collision
一、知识要点
1、MonoBehaviour.OnCollisionEnter猾诮沓靥(Collision)：1）功能简述otherThe Collision data associated with t茑霁酌绡his collision.OnCollisionEnter is called when this collider/rigidbody has begun touching another rigidbody/collider.In contrast to OnTriggerEnter, OnCollisionEnter is passed theCollisionclass and not aCollider. TheCollisionclass contains information about contact points, impact velocity etc. If you don't use collisionInfo in the function, leave out the collisionInfo parameter as this avoids unneccessary calculations. Notes: Collision events are only sent if one of the colliders also has a non-kinematic rigidbody attached. Collision events will be sent to disabled MonoBehaviours, to allow enabling Behaviours in response to collisions.2）使用举例using UnityEngine;using System.Collections;public class ExampleClass : MonoBehaviour{ AudioSource audioSource; void Start() { audioSource = GetComponent<AudioSource>(); } void OnCollisionEnter(Collision collision) { foreach (ContactPoint contact in collision.contacts) { Debug.DrawRay(contact.point, contact.normal, Color.white); } if (collision.relativeVelocity.magnitude > 2) audioSource.Play(); }}
2、Collision.contacts：1犬匮渝扮）功能简述public ContactPoint[]contacts;The contact points generated by the physics engine.Every contact contains a contact point, normal and the two colliders that collided (seeContactPoint). From insideOnCollisionStayorOnCollisionEnteryou can always be sure thatcontactshas at least one element.2）使用举例using UnityEngine;using System.Collections;public class ExampleClass : MonoBehaviour { void OnCollisionStay(Collision collision) { foreach (ContactPoint contact in collision.contacts) { print(contact.thisCollider.name + " hit " + contact.otherCollider.name); Debug.DrawRay(contact.point, contact.normal, Color.white); } }}
二、Collision教程 之 碰撞接触点的快速获取
1、打开Unity，新建一个空工程，具体如下图
2、在场景中，新建一个“Plane”、“Cube”和“Sphere”，调整好他们间的布局，具体如下图
3、在场景中，新建一个粒子系统，调整好参数，并把它作为预制体，具体如下图
4、在工程中，新建一个脚本“CollisionTest”，双击脚本或者右键“Open C# Project”打开脚本，具体如下图
5、“CollisionTest”脚本上编写代码，首先设置变量，然后实现碰撞进入后在接触点生成物体，具体代码和代码说明如下图
6、“CollisionTest”脚本具体内容如下usingSystem.Collections;usingSystem.Collections.Generic;usingUnityEngine;publicclassCollisionTest:MonoBehaviour{publicGameObjectgo;//Usethisforinitialization voidStart(){ } //Updateiscalledonceperframe voidUpdate(){ }voidOnCollisionEnter(Collisioncollision) { Debug.Log("Enter");Instantiate(go,collision.contacts[0].point,go.transform.rotation); }}
7、脚本编辑正确，回到Unity界面，把脚本“CollisionTest”赋给“Cube”，并把粒子预制体赋给脚本，在“Sphere”添加“Rigidbody”组件，具体如下图
8、运行场景，移动“Sphere”接触“Cube”，既可以看到接触点生成粒子，具体如下图
