[游戏开发][Unity]GameObject贴合地面脚本

using UnityEditor;
using UnityEngine;

public class ZeroToolEditor
{
    private static readonly RaycastHit[] Cache = new RaycastHit[10];

    private static Vector3? GetHitPoint(Transform transform)
    {
        var count = Physics.RaycastNonAlloc(transform.position + Vector3.up, Vector3.down, Cache, 100f);
        for (int i = 0; i < count; i++)
        {
            if (Cache[i].transform == transform)
            {
                continue;
            }
            
            return Cache[i].point;
        }

        return null;
    }

    [MenuItem("Zero Tools/Snap To Ground")]
    public static void SnapToGround()
    {
        foreach (var transform in Selection.transforms)
        {
            var hitPoint = GetHitPoint(transform);
            if (hitPoint.HasValue)
            {
                Undo.RecordObject(transform, "Snap To Ground");
                transform.position = hitPoint.Value;
            }
        }
    }

    [MenuItem("Zero Tools/Snap To Ground Add Extents Y")]
    public static void SnapBoxToGround()
    {
        foreach (var transform in Selection.transforms)
        {
            var hitPoint = GetHitPoint(transform);
            if (hitPoint.HasValue)
            {
                Undo.RecordObject(transform, "Snap To Ground");

                var pos = hitPoint.Value;
                var collider = transform.GetComponent<Collider>();
                if (collider)
                {
                    pos.y += collider.bounds.extents.y;
                }

                transform.position = pos;
            }
        }
    }
}