使用 for 循环的光线投射(使用 Unity C#)制作视野

Question

代码：

        void IdleState ()
    {
    RaycastHit hit;
    for (float i = -ViewWidth; i < ViewWidth; i++)
        { 
            float Iterater = i/20;
            if (Physics.Raycast(transform.position, transform.forward + new Vector3(Iterater,0,0), out hit, ViewRange))
             {
                Debug.DrawRay(transform.position,(transform.forward + new Vector3(Iterater,0,0)).normalized * ViewRange, Color.red);
                if (hit.transform.gameObject.layer == LayerMask.NameToLayer("Player"))
                 {
                    FoundPlayer(hit.transform);
                 }
             }
        }
}

问题：在 Unity 中，我尝试通过使用 for 循环绘制多个光线投射来为敌方 AI 创建视野。 出于某种原因，光线投射会这样做：.GIF

几天来我一直在尝试解决此问题，请帮忙！

还有 FoundPlayer（） 函数，以防你需要它：

void FoundPlayer  (Transform DetectedObject)
    { 
        float step = TurnSpeed * Time.deltaTime;
        Vector3 Direc = DetectedObject.position - transform.position;
        Vector3 RotMath = Vector3.RotateTowards(transform.forward, Direc,step,0.0f);
        transform.rotation = Quaternion.LookRotation(RotMath);
        Vector3 CurrentRot = transform.eulerAngles;
        transform.rotation = Quaternion.Euler(0,CurrentRot.y,0);
    }

FoundPlayer（） 函数只是在其中一个光线投射击中玩家时将敌人旋转到玩家身边。

Answer 1

关于光线投射：

transform.Forward位于世界空间坐标中，您可以向该坐标添加世界空间 X 轴偏移量的一部分。 你想要的是添加一些"局部空间"X轴的一部分。 transform.Right是局部空间 X 轴的世界空间转换。 尝试：

var rayDirection = (transform.Forward + (Vector3.Scale(transform.Right, new Vector3(Iterater, 0, 0))).normalized;

---

关于视野：

如果您只想检查 FOV 中的对象，请开始查找球体内的所有对象，然后将这些对象过滤到与 transform.forward 的适当角度：

float ViewRange = 10;
float hHalfFov = 45; // Horizontal Half-Field of View (Degrees)
float vHalfFov = 45; // Vertical Half-Field of View (Degrees)
void IdleState() {
    // Find all colliders within ViewRange
    var hits = Physics.OverlapSphere(transform.position, ViewRange);
    foreach (var hit in hits) {
        if ( hit.gameObject == this.gameObject ) continue; // don't hit self
        // Check FOV
        var direction = (transform.position - hit.transform.position);
        var hDirn = Vector3.ProjectOnPlane(direction, transform.up).normalized; // Project onto transform-relative XY plane to check hFov
        var vDirn = Vector3.ProjectOnPlane(direction, transform.right).normalized; // Project onto transform-relative YZ plane to check vFov
        var hOffset = Vector3.Dot(hDirn, transform.forward) * Mathf.Rad2Deg; // Calculate horizontal angular offset in Degrees
        var vOffset = Vector3.Dot(vDirn, transform.forward) * Mathf.Rad2Deg; // Calculate vertical angular offset in Degrees
        if (hOffset > hHalfFov || vOffset > vHalfFov) continue; // Outside of FOV
        Debug.DrawLine(transform.position, hit.transform.position, Color.red);
        if (hit.transform.gameObject.layer == LayerMask.NameToLayer("Player")) {
            FoundPlayer(hit.transform);
        }
    }
}