[unity3d] collider assembly

1 Preface

        Unity3D Middle collision body （Collider） The component is used to detect whether collision occurs between moving objects , It can also be used as a trigger . The conditions for collision are ：

• 2 Each game object has  Collider
• At least one GameObject has Rigidbody
• 2 Game objects keep relative motion （ One Cube Put it in Plane On , There's no collision , Because there is no relative motion ）

        The boundary of the collider does not necessarily coincide with the boundary of the game object , Users can click Edit Collider Button to edit the boundary of the collider , You can also adjust the collider boundary in the property panel . in addition , The user can check Is Trigger Options , Use as a trigger （ Uncheck to use as collider ）, When used as a trigger , There's no collision , Game objects will meet and cross .

        1） The callback method  

        Collider callback method ：

//  The collision begins 
void OnCollisionEnter(Collision other)
//  During the collision , Once per frame 
void OnCollisionStay(Collision other)
//  End of collision 
void OnCollisionExit(Collision other)

        Trigger callback method ：

//  Trigger start 
void OnTriggerEnter(Collider other)
//  During triggering , Once per frame 
void void OnTriggerStay(Collider other)
//  Trigger end 
void OnTriggerExit(Collider other)

          explain ： The callback methods corresponding to the collider and trigger are MonoBehaviour The method in , Users can override these methods in script components , The callback method corresponding to the collider and trigger can only execute one of them , When used as a trigger , You cannot execute the callback method corresponding to the collider .

        2） Callback Arguments

         Collision Parameters

//  Collide object's collider components 
Collider collider = collision.collider;
//  Collision point information 
ContactPoint[] contactPoint = collision.contacts;
Vector3 point = contactPoint[0].point;

        Collider Parameters

//  Get the of the collider MeshRenderer Components 
MeshRenderer meshRenderer = collider.GetComponent<MeshRenderer>();

2 application

2.1 Collider application

        1） Create game objects

         The object of the game Transform The component parameters are as follows ：  

Name	Type	Position	Rotation	Scale	Color
Plane	Plane	(0, 0, 0)	(0, 0, 0)	(1, 1, 1)	#ABA4A4FF
Cube	Cube	(0.1, 3, -4.4)	(0, 0, 0)	(1, 1, 1)	#F41E1EFF
Sphere	Sphere	(0, 1, -4.5)	(0, 0, 0)	(1, 1, 1)	#F41E1EFF

          Add ： to Cube add to Rigidbody Rigid body components .

         2） Script components

         to Cube Game objects add script components , as follows ：

        ColliderController.cs

using UnityEngine;

public class ColliderController : MonoBehaviour {

	private void OnCollisionEnter(Collision other) {
		other.collider.GetComponent<MeshRenderer>().material.color = Color.green;
	}

	private void OnCollisionStay(Collision other) {
		GetComponent<MeshRenderer>().material.color = Color.yellow;
	}

	private void OnCollisionExit(Collision other) {
		other.collider.GetComponent<MeshRenderer>().material.color = Color.blue;
	}
}

        3） Running effect

2.2 Trigger applications

        1） Create game objects

         The object of the game Transform The component parameters are as follows ：  

Name	Type	Position	Rotation	Scale	Color
Plane	Plane	(0, 0, 0)	(0, 0, 0)	(2, 2, 2)	#ABA4A4FF
Cube	Cube	(0, 3, -4.8)	(0, 0, 0)	(1.7, 0.5, 1.7)	#F41E1EFF
Sphere	Sphere	(0, 4.5, -4.8)	(0, 0, 0)	(1, 1, 1)	#F41E1EFF

          Add ： to Sphere add to Rigidbody Rigid body components ,Collider Component check Is Trigger Options .

         2） Script components

         to Sphere Game objects add script components , as follows ：

        TriggerController.cs

using UnityEngine;

public class TriggerController : MonoBehaviour {

	private void OnTriggerEnter(Collider other) {
		other.GetComponent<MeshRenderer>().material.color = Color.green;
	}

	private void OnTriggerStay(Collider other) {
		GetComponent<MeshRenderer>().material.color = Color.yellow;
	}

	private void OnTriggerExit(Collider other) {
		other.GetComponent<MeshRenderer>().material.color = Color.blue;
	}
}

        3） Running effect