RayCast

RayHit.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class RayHit : MonoBehaviour
{
    [SerializeField]
    private GameObject _hitObject = null;
    public GameObject HitObject {
        get { return this._hitObject; }
        private set { this._hitObject = value; }
    }

    public GameObject Ray(string layerName, float distance) {
        var layerMask = LayerMask.NameToLayer(layerName);
        return this.Ray(layerMask, distance);
    }

    public GameObject Ray(string[] layerNames, float distance) {
        int layerMask = 0;

        foreach (var name in layerNames) {
            int layer = LayerMask.NameToLayer(name);
            layerMask += layer;
        }

        return this.Ray(layerMask, distance);
    }

    public GameObject Ray(int layerMask, float distance) {
        return this.Ray(layerMask, Input.mousePosition, distance);
    }


    public GameObject Ray(int layerMask, Vector3 screenPos, float distance) {
        var hit_info = new RaycastHit();

        var ray = Camera.main.ScreenPointToRay(screenPos);
        var direction = Vector3.forward;

        var is_hit = Physics.Raycast(ray, out hit_info, distance, layerMask);

        if (is_hit == true) {
            this.HitObject = hit_info.transform.gameObject;
        } else {
            this.HitObject = null;
        }

        return this.HitObject;
    }
}