NLDClient-yudde/ProjectNLD/Assets/Code/Scripts/Gameplay/Utils/GroundHitHelper.cs

using Gameplay.Level;
using TGS;

namespace Gameplay
{
    using UnityEngine;

    public static class GroundHitHelper
    {
        private static RaycastHit[] _raycastHits = new RaycastHit[10];

        public static int CalcHitCellIndex(Vector2 mousePose, TerrainGridSystem tgs)
        {
            var camera = Camera.main;
            var ray = camera.ScreenPointToRay(mousePose);
            var layerMask = LayerMask.GetMask("Ground");
            var raycastCount = Physics.RaycastNonAlloc(ray, _raycastHits, 1000, layerMask);
            if (raycastCount > 0)
            {
                var firstHit = _raycastHits[0];
                var hitPoint = firstHit.point;
                var cell = tgs.CellGetAtPosition(hitPoint, true);
                return cell?.index ?? -1;
            }

            return -1;
        }
    }
}