如何在2D中创建两个圆之间的对撞机

Question

我创建了第一个图像的网格，我想要粉红色阴影区域之间的对撞机

写完以下脚本后，我在第二张图片中找到了对撞机

    void InnerOuterCircle () {

    vertice = new List<Vector3> ();
    triangle = new List<int> ();

    for (int x = 0; x <= angle; x ++) {

        vertice.Add(new Vector3(Mathf.Cos(x * Mathf.Deg2Rad) * innerRadius,Mathf.Sin(x * Mathf.Deg2Rad) * innerRadius));
        vertice.Add(new Vector3(Mathf.Cos(x * Mathf.Deg2Rad) * outerRadius,Mathf.Sin(x * Mathf.Deg2Rad) * outerRadius));

    }

    for (int x = 0; x < vertice.Count - 2; x += 2) {

        triangle.Add (x + 0);
        triangle.Add (x + 2);
        triangle.Add (x + 1);

        triangle.Add (x + 2);
        triangle.Add (x + 3);
        triangle.Add (x + 1);

    }

    Mesh mesh = new Mesh ();

    MeshFilter filter = GetComponent<MeshFilter> ();
    filter.mesh = mesh;

    mesh.vertices = vertice.ToArray ();
    mesh.triangles = triangle.ToArray ();

    PolygonCollider2D collider = gameObject.AddComponent<PolygonCollider2D> ();
    Vector2[] edgePoints = new Vector2[vertice.Count];
    for (int i = 0; i < vertice.Count; i++) {
        edgePoints [i] = vertice [i];
    }
    collider.points = edgePoints;
}

Answer 1

假设在Unity中可以进行自定义碰撞检测逻辑，则圆之间的碰撞检测相当简单;只需在他们的中心之间的向量上使用毕达哥拉斯定理：

return distance <= r1outer + r2outer && distance >= r1inner + r2inner;

如果圆圈的中心有圆孔，你可以添加一个额外的测试，以确保它们不太接近，与现有的半径测试相同，但是使用＆gt; =而不是＆lt; = on on内：

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