Unity：将爆炸力添加到 2D

Question

我想将我的脚本更改为 2D c# 脚本。我知道 AddExplosionForce 不是 UnityEngine.Rigidbody2D 的成员，所以我如何将其更改为 2D 脚本，并且仍然对所有方向施加相同的力。（基本上做同样的事情，但是在 2D 中）谢谢！这是我的脚本：

#  pragma strict

var explosionStrength : float = 100;

 function OnCollisionEnter(_other: Collision) 
{
if (_other.collider.gameObject.name == "Bouncy object")
   _other.rigidbody.AddExplosionForce(explosionStrength, this.transform.position,5);
}

Answer 1

据我所知，没有内置任何内容，但实际上很容易实现。这是使用扩展方法的示例：

using UnityEngine;

public static class Rigidbody2DExt {

    public static void AddExplosionForce(this Rigidbody2D rb, float explosionForce, Vector2 explosionPosition, float explosionRadius, float upwardsModifier = 0.0F, ForceMode2D mode = ForceMode2D.Force) {
        var explosionDir = rb.position - explosionPosition;
        var explosionDistance = explosionDir.magnitude;

        // Normalize without computing magnitude again
        if (upwardsModifier == 0)
            explosionDir /= explosionDistance;
        else {
            // From Rigidbody.AddExplosionForce doc:
            // If you pass a non-zero value for the upwardsModifier parameter, the direction
            // will be modified by subtracting that value from the Y component of the centre point.
            explosionDir.y += upwardsModifier;
            explosionDir.Normalize();
        }

        rb.AddForce(Mathf.Lerp(0, explosionForce, (1 - explosionDistance)) * explosionDir, mode);
    }
}

现在您可以像使用 3D 刚体 AddExplosionForce 一样简单地使用它，例如在您的代码中：

public class Test : MonoBehaviour {
    public float explosionStrength  = 100;

    void OnCollisionEnter2D( Collision2D _other) 
    {
        if (_other.collider.gameObject.name == "Bouncy object")
            _other.rigidbody.AddExplosionForce(explosionStrength, this.transform.position,5);
    }
}

请参阅演示： https://dl.dropboxusercontent.com/u/16950335/Explosion/index.html

来源： https ://dl.dropboxusercontent.com/u/16950335/Explosion/AddExplosionForce2D.zip