- 자습서
- 2D Game Creation
- Detecting Overlaps
Detecting Overlaps
확인 완료한 버전: 5.6
-
난이도: 중급
In this live training session we will learn how to create a character controller for a 2D platform game which uses custom physics instead of Unity’s built in 2D Physics.


Detecting Overlaps
중급 2D Game Creation
Download the asset package here
PhysicsObject
Code snippet
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
public class PhysicsObject : MonoBehaviour {
public float minGroundNormalY = .65f;
public float gravityModifier = 1f;
protected Vector2 targetVelocity;
protected bool grounded;
protected Vector2 groundNormal;
protected Rigidbody2D rb2d;
protected Vector2 velocity;
protected ContactFilter2D contactFilter;
protected RaycastHit2D[] hitBuffer = new RaycastHit2D[16];
protected List<RaycastHit2D> hitBufferList = new List<RaycastHit2D> (16);
protected const float minMoveDistance = 0.001f;
protected const float shellRadius = 0.01f;
void OnEnable()
{
rb2d = GetComponent<Rigidbody2D> ();
}
void Start ()
{
contactFilter.useTriggers = false;
contactFilter.SetLayerMask (Physics2D.GetLayerCollisionMask (gameObject.layer));
contactFilter.useLayerMask = true;
}
void Update ()
{
targetVelocity = Vector2.zero;
ComputeVelocity ();
}
protected virtual void ComputeVelocity()
{
}
void FixedUpdate()
{
velocity += gravityModifier * Physics2D.gravity * Time.deltaTime;
velocity.x = targetVelocity.x;
grounded = false;
Vector2 deltaPosition = velocity * Time.deltaTime;
Vector2 moveAlongGround = new Vector2 (groundNormal.y, -groundNormal.x);
Vector2 move = moveAlongGround * deltaPosition.x;
Movement (move, false);
move = Vector2.up * deltaPosition.y;
Movement (move, true);
}
void Movement(Vector2 move, bool yMovement)
{
float distance = move.magnitude;
if (distance > minMoveDistance)
{
int count = rb2d.Cast (move, contactFilter, hitBuffer, distance + shellRadius);
hitBufferList.Clear ();
for (int i = 0; i < count; i++) {
hitBufferList.Add (hitBuffer [i]);
}
for (int i = 0; i < hitBufferList.Count; i++)
{
Vector2 currentNormal = hitBufferList [i].normal;
if (currentNormal.y > minGroundNormalY)
{
grounded = true;
if (yMovement)
{
groundNormal = currentNormal;
currentNormal.x = 0;
}
}
float projection = Vector2.Dot (velocity, currentNormal);
if (projection < 0)
{
velocity = velocity - projection * currentNormal;
}
float modifiedDistance = hitBufferList [i].distance - shellRadius;
distance = modifiedDistance < distance ? modifiedDistance : distance;
}
}
rb2d.position = rb2d.position + move.normalized * distance;
}
}
PlayerPlatformerController
Code snippet
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
public class PlayerPlatformerController : PhysicsObject {
public float maxSpeed = 7;
public float jumpTakeOffSpeed = 7;
private SpriteRenderer spriteRenderer;
private Animator animator;
// Use this for initialization
void Awake ()
{
spriteRenderer = GetComponent<SpriteRenderer> ();
animator = GetComponent<Animator> ();
}
protected override void ComputeVelocity()
{
Vector2 move = Vector2.zero;
move.x = Input.GetAxis ("Horizontal");
if (Input.GetButtonDown ("Jump") && grounded) {
velocity.y = jumpTakeOffSpeed;
} else if (Input.GetButtonUp ("Jump"))
{
if (velocity.y > 0) {
velocity.y = velocity.y * 0.5f;
}
}
bool flipSprite = (spriteRenderer.flipX ? (move.x > 0.01f) : (move.x < 0.01f));
if (flipSprite)
{
spriteRenderer.flipX = !spriteRenderer.flipX;
}
animator.SetBool ("grounded", grounded);
animator.SetFloat ("velocityX", Mathf.Abs (velocity.x) / maxSpeed);
targetVelocity = move * maxSpeed;
}
}