c# - Unity 敌人 ai 总是向玩家上方发射子弹

Question

遇到了一个问题，即敌人会向玩家开火，但似乎总是开到高处或向玩家的一侧，即使玩家是静止的并且没有移动。我是不是在我的代码中做错了什么导致了这个疯狂的问题，或者它只是一个随机的烦人的错误？

为播放器使用相同的脚本，尽管它的名称不同，但我认为问题出在火点内。在玩家的脚本下我是这样开火的:

 // Get the place the player has clicked
            Ray ray = Camera.main.ScreenPointToRay(Input.mousePosition);

            // Holds information regarding the mouseclick
            RaycastHit hitInfo;

            // Now work out if we fire or not
            if (Physics.Raycast(ray, out hitInfo))
            {
                if(hitInfo.distance < maxRange)
                {
                    FireAtPoint(hitInfo.point);

而在敌人脚本中，它只是通过玩家的位置完成的。

// Holds information regarding the mouseclick
            RaycastHit hitInfo;

            // Now work out if we fire or not
            if (Physics.Raycast(player.transform.position,transform.forward, out hitInfo))
            {

那么这是 Physics.Raycast 调用中的潜在问题吗？

其余代码供引用:

//More above this but doesn't influence the firing
if (Physics.Raycast(player.transform.position,transform.position, out hitInfo))
{
    if (hitInfo.distance < maxRange)
    {
       FireAtPoint(hitInfo.point);
    }
}


private void FireAtPoint(Vector3 point)
{

// Get the velocity to fire out at
var velocity = FiringVelocity(point, angle);

Rigidbody rg = Instantiate(bulletPrefab.gameObject, firePoint.position, firePoint.rotation).GetComponent<Rigidbody>();

EnemyBulletController newProjectile = rg.GetComponent<EnemyBulletController>();

newProjectile.speed = velocity;

}


private Vector3 FiringVelocity(Vector3 destination, float angle)
{
// Get the direction of the mouse click from the player, then get the height differential. 
Vector3 direction = destination - transform.position;
float height = direction.y;
height = 0;

// Get the distance in a float of the vector3
float distance = direction.magnitude;

// Turn the firing angle into radians for calculations, then work out any height differential
float AngleRadians = angle * Mathf.Deg2Rad;
direction.y = distance * Mathf.Tan(AngleRadians);
distance += height / Mathf.Tan(AngleRadians);

// Calculate the velocity magnitude
float velocity = Mathf.Sqrt(distance * Physics.gravity.magnitude / Mathf.Sin(2 * AngleRadians));

// Return the normalized vector to fire at.
return velocity * direction.normalized;
}

引用图片:

Answer 1

您计算速度的方程式看起来很可疑。让我们重新推导它:

恒重力下的自由落体运动方程为:

通过将第一个替换为第二个来重新排列后，我们找到射击速度的表达式:

这与您所拥有的不同，因为您缺少 h/d 术语；所述术语还对 θ 的允许值进行了限制:

(基本上意味着如果你直接向目标射击，子弹将永远不会由于重力而到达)

您的代码还有许多其他问题；仅列出三个:

• 为什么要将 height 设置为零？
• 为什么要对distance 进行修正？校正没有物理解释。
• @BasillePerrnoud 建议的修复

修改后的代码:

private Vector3 FiringVelocity(Vector3 destination, float angle)
{
   Vector3 direction = destination - transform.position;
   float height = direction.y;
   float distance = Mathf.Sqrt(direction.x * direction.x + direction.z * direction.z);  // *horizontal* distance

   float radians = angle * Mathf.Deg2Rad;
   float hOverd = height / distance;
   float tanAngle = Mathf.Tan(radians);

   if (tanAngle <= hOverd)
       // throw an exception or return an error code, because no solution exists for v

   float cosAngle = Mathf.Cos(radians);
   direction.Y = distance / cosAngle;

   float velocity = Mathf.Sqrt((distance * Physics.gravity.magnitude) / 
                   (2 * cosAngle * cosAngle * (tanAngle - hOverd)));
   return velocity * direction.normalized;
}