碰撞检测之Sphere-Sphere检测

最新推荐文章于 2024-05-17 20:45:00 发布

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本文介绍了一种简单的球体碰撞检测算法，并提供了Unity实现代码。通过计算两球心之间的距离是否小于两球半径之和来判断球体是否发生碰撞。

今天超级简单！

判断两个球相交不相交，直接判断两个球心的距离是否大于两个半径的和就可以了。

检测代码

public static bool IntersectSphereSphere(Sphere sphere0, Sphere sphere1)
        {
            Vector3 delta = sphere0.center - sphere1.center;
            return delta.sqrMagnitude <= (sphere0.radius + sphere1.radius) * (sphere0.radius + sphere1.radius);
        }

测试代码

public class SphereSphereTester : MonoBehaviour {
    public GameObject sphere0;
    public GameObject sphere1;

    Sphere _sphere0;
    Sphere _sphere1;

    // Use this for initialization
    void Start()
    {
        _sphere0 = new Sphere();
        _sphere1 = new Sphere();
    }

    // Update is called once per frame
    void Update()
    {
        UpdateShapes();
        if (NIntersectTests.IntersectSphereSphere(_sphere0, _sphere1))
        {
            sphere0.GetComponent<MeshRenderer>().materials[0].SetColor("_Color", new Color(1, 0, 0));
        } else
        {
            sphere0.GetComponent<MeshRenderer>().materials[0].SetColor("_Color", new Color(1, 1, 1));
        }
    }

    void UpdateShapes()
    {
        _sphere0.center = sphere0.transform.position;
        _sphere0.radius = 0.5f * sphere0.transform.localScale.x;

        _sphere1.center = sphere1.transform.position;
        _sphere1.radius = 0.5f * sphere1.transform.localScale.x;
    }
}

运行结果