Unity Collision教程 之 碰撞接触点的快速获取
1、MonoBehaviour.OnCollisionEnter(Collision)：
1）功能简述
otherThe Collision data associated with this collision.
OnCollisionEnter is called when this collider/rigidbody has begun touching another rigidbody/collider.
In contrast to OnTriggerEnter, OnCollisionEnter is passed the Collision class and not a Collider. The Collision class 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）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 (see ContactPoint). From inside OnCollisionStay or OnCollisionEnter you can always be sure that contacts has 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);
}
}
}
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
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
public class CollisionTest : MonoBehaviour {
public GameObject go;
// Use this for initialization
void Start () {
}
// Update is called once per frame
void Update () {
}
void OnCollisionEnter(Collision collision)
{
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
