Dynamic Colliders, Releasing Pooled Objects (Unity)

References

• Introduction to collision

Table of Content

• References
• Table of Content
• Dynamically Resize Colliders
• Release Pooled Objects

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Dynamically Resize Colliders

• After initializing the boundaries of the scene, position and resize the box colliders.
• Enclose the play area with walls, these BoxColliders will belong to the Projectiles Limit physics layer.
• Using properties like padding and wall height, we can control the shape of the enclosing.

1public BoxCollider top;
2public BoxCollider bottom;
3public BoxCollider left;
4public BoxCollider right;
5public float padding = 3.0f;
6public float wallHeight = 5.0f;
7public float wallThickness = 1.0f;

1public void Initialize(Boundaries boundaries)
2{
3    var bottomLeft = boundaries.bottomLeft;
4    var topRight = boundaries.topRight;
5
6    // position
7    var centerX = 0;
8    var avgZ = (topRight.position.z + bottomLeft.position.z) / 2;
9
10    var topZ = topRight.position.z + padding;
11    var bottomZ = bottomLeft.position.z - padding;
12
13    var leftX = -topRight.position.x - padding;
14    var rightX = topRight.position.x + padding;
15
16    top.transform.position = new Vector3(centerX, 0, topZ);
17    bottom.transform.position = new Vector3(centerX, 0, bottomZ);
18    left.transform.position = new Vector3(leftX, 0, avgZ);
19    right.transform.position = new Vector3(rightX, 0, avgZ);
20
21    // size
22    var deltaX = (2 * topRight.position.x) + (2 * padding);
23    var deltaZ = topRight.position.z - bottomLeft.position.z + (2 * padding);
24
25    top.size = new Vector3(deltaX, wallHeight, wallThickness);
26    bottom.size = new Vector3(deltaX, wallHeight, wallThickness);
27    left.size = new Vector3(wallThickness, wallHeight, deltaZ);
28    right.size = new Vector3(wallThickness, wallHeight, deltaZ);
29}

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Release Pooled Objects

• Make Bullets belong to the Player Projectiles physics layer.
• In the phyiscs collisions matrix, make sure to enable the interaction between Player Projectiles and Projectiles Limit.
• Define the OnTriggerEnter() message in the projectiles, and make them signal their Gun to release the pooled object.

1public class Bullet : MonoBehaviour
2{
3    public Gun gun; // this is set by the gun, when shooting
4
5    private void OnTriggerEnter(Collider other)
6    {
7        gun.ReclaimBullet(this);
8    }
9}

1public class Gun : MonoBehaviour
2{
3    public void ReclaimBullet(Bullet bullet)
4    {
5        bulletsPool.Release(bullet);
6    }
7}