【Unity】RaycastとOverlapの使い方｜視線・範囲・壁越えのオブジェクト検出を完全解説

bool hit = Physics.Raycast(発射位置, 方向, out RaycastHit 情報, 距離, レイヤーマスク);

using UnityEngine;

public class RaycastExample : MonoBehaviour
{
    void Update()
    {
        Ray ray = new Ray(transform.position, transform.forward);
        RaycastHit hit;

        if (Physics.Raycast(ray, out hit, 10f))
        {
            Debug.Log("ヒット: " + hit.collider.gameObject.name);
        }

        // デバッグ用にRayをシーンビューで表示
        Debug.DrawRay(transform.position, transform.forward * 10f, Color.red);
    }
}

public LayerMask targetLayer; // 検出したいレイヤーを指定

void Update()
{
    Ray ray = new Ray(transform.position, transform.forward);
    RaycastHit hit;

    if (Physics.Raycast(ray, out hit, 10f, targetLayer))
    {
        Debug.Log("ターゲットにヒット: " + hit.collider.gameObject.name);
    }
}

RaycastHit[] hits = Physics.RaycastAll(transform.position, transform.forward, 10f);
foreach (RaycastHit hit in hits)
{
    Debug.Log("複数ヒット: " + hit.collider.gameObject.name);
}

Collider[] colliders = Physics.OverlapSphere(transform.position, 5f);

foreach (Collider col in colliders)
{
    Debug.Log("範囲内のオブジェクト: " + col.gameObject.name);
}

Collider[] colliders = Physics.OverlapBox(transform.position, new Vector3(3f, 3f, 3f));

foreach (Collider col in colliders)
{
    Debug.Log("ボックス範囲内: " + col.gameObject.name);
}