Unity 以一定角度启动刚体

Question

我希望以 30˚ 的角度和 30 m/s 的速度发射我的 Arrow GameObject。在脚本中，我向 Arrow 添加了一个刚体。但是，我也在尝试在 3D 场景 中朝玩家的方向（远离敌人）发射这个 Arrow。我不知道如何插入这些变量以获得 "arrowRigidbody.velocity"

的 Vector3

//THE VARIABLES REFERENCED ABOVE APPEAR LIKE SO:
Rigidbody arrowRigidbody;
Transform playerTransform;
Transform enemyTransform;
float angle = 30f;
float velocity = 30f;

//How do I use these variables in order to shoot the projectile at a speed
//of 30 m/s and an angle of 30˚ in the direction of the player in 3D scene
arrowRigidbody.velocity = /*????*/;

感谢您的时间和耐心:)

Answer 1

使用一些几何学，知道向量的大小 (m) 为 1，y 分量将为 m/2，x 分量将为 m*(3^.5)/2 .这将使您的最终价值：

arrowRigidbody.velocity = new Vector2(Mathf.Pow(3, .5f)/2, 1/2) * velocity;

对于变化的角度，您知道 x 分量将为 m * cos(angle)，y 分量将为 m * sin(angle)，剩下：

float velx = velocity * Mathf.Cos(angle * Mathf.Deg2Rad);
float vely = velocity * Mathf.Sin(angle * Mathf.Deg2Rad);
arrowRigidbody.velocity = new Vector2(velx, vely);

Answer 2

假设你只拍摄 'forward' 你可以使用简化的：

    var targetDirn = transform.forward;
    var elevationAxis = transform.right;

    var releaseAngle = 30f;
    var releaseSpeed = 30f;

    var releaseVector = Quaternion.AngleAxis(releaseAngle, elevationAxis) * targetDirn;
    arrowRigidbody.velocity = releaseVector * releaseSpeed;

如需拍摄'off-axis'，可替换前两行：

    var targetDirn = (target.transform.position - transform.position).normalized;
    var elevationAxis = Vector3.Cross(targetDirn, Vector3.up);

Unity 以一定角度启动刚体

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c#

rigid-bodies

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game-physics