我正在Unity里尝试自定义规则瓦片，想实现一个核心效果：让瓦片上“延伸出去”到上方瓦片区域的部分，优先级比上方放置的瓦片更高，能显示在它们的上层。

简单来说，我的瓦片集里有些瓦片会“延伸”到上方相邻的两个六边形瓦片区域，但用规则瓦片绘制时，这些延伸部分会被上方的瓦片挡住，边缘衔接得特别生硬，完全看不到自然的溢出效果。举个具体例子：单独放置的森林瓦片，树会稍微超出六边形的顶部；当在它上方放其他瓦片时，这些树本该显示在上方瓦片的上层，实现自然融合，但现在延伸的部分直接被上方瓦片切掉了。

我试着写了一个自定义六边形规则瓦片的脚本，但没起作用，代码如下：

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

[CreateAssetMenu(fileName = "New Custom Hexagonal Rule Tile", menuName = "Tiles/Custom Hexagonal Rule Tile")]
public class CustomHexagonalRuleTile : HexagonalRuleTile
{
    public List<TileBase> possibleTiles; // List of possible tiles that share the same directional rules

    // Define the positions of the neighbors in a pointy top hexagonal grid
    private static readonly Vector3Int[] HexagonalNeighbors = new Vector3Int[]
    {
        new Vector3Int(1, 0, 0),  // Right
        new Vector3Int(1, -1, 0), // Bottom Right
        new Vector3Int(0, -1, 0), // Bottom Left
        new Vector3Int(-1, 0, 0), // Left
        new Vector3Int(-1, 1, 0), // Top Left
        new Vector3Int(0, 1, 0)   // Top Right
    };
    
    public override void GetTileData(Vector3Int position, ITilemap tilemap, ref TileData tileData)
    {
        base.GetTileData(position, tilemap, ref tileData);
    
        // Check for overflow from the Top Right
        Vector3Int topRight = position + HexagonalNeighbors[5];
        if (tilemap.GetTile(topRight) == this)
        {
            // Handle overflow from the Top Right
            // Randomly select a tile from the list of possible tiles
            if (possibleTiles != null && possibleTiles.Count > 0)
            {
                TileBase selectedTile = possibleTiles[Random.Range(0, possibleTiles.Count)];
                tileData.sprite = ((Tile)selectedTile).sprite; // Set the sprite of the selected tile
                tileData.transform = Matrix4x4.Translate(new Vector3(0, 0.5f, 0)); // Adjust the position to show overflow
            }
        }
    
        // Check for overflow from the Top Left
        Vector3Int topLeft = position + HexagonalNeighbors[4];
        if (tilemap.GetTile(topLeft) == this)
        {
            // Handle overflow from the Top Left
            // Randomly select a tile from the list of possible tiles
            if (possibleTiles != null && possibleTiles.Count > 0)
            {
                TileBase selectedTile = possibleTiles[Random.Range(0, possibleTiles.Count)];
                tileData.sprite = ((Tile)selectedTile).sprite; // Set the sprite of the selected tile
                tileData.transform = Matrix4x4.Translate(new Vector3(0, 0.5f, 0)); // Adjust the position to show overflow
            }
        }
    }
}

我感觉问题可能出在我没正确用代码定义“溢出部分”的逻辑，有没有大佬遇到过类似的情况呀？

补充说明：我特意找了张图来更清楚地展示问题：

可以看到，上方没放瓦片时，森林瓦片有延伸到上方区域的部分；但放上瓦片后，这些延伸部分就消失了，衔接得很不自然。抱歉一开始没放图😅

备注：内容来源于stack exchange，提问作者martin pedersen