private TileChunk _GetTileChunk(int tileX, int tileY, int layer)
{
TileChunkLayer chunkLayer = _GetTileChunkLayer(layer);
int rowTotalChunks = 1 + ((m_autoTileMap.MapTileWidth - 1) / k_TileChunkWidth);
int chunkIdx = (tileY / k_TileChunkHeight) * rowTotalChunks + (tileX / k_TileChunkWidth);
TileChunk tileChunk = chunkLayer.TileChunks[chunkIdx];
if (tileChunk == null)
{
int startTileX = tileX - tileX % k_TileChunkWidth;
int startTileY = tileY - tileY % k_TileChunkHeight;
GameObject chunkObj = new GameObject();
chunkObj.name = "TileChunk" + startTileX + "_" + startTileY;
chunkObj.transform.parent = chunkLayer.ObjNode.transform;
chunkObj.hideFlags = HideFlags.NotEditable;
tileChunk = chunkObj.AddComponent <TileChunk>();
chunkLayer.TileChunks[chunkIdx] = tileChunk;
tileChunk.Configure(m_autoTileMap, layer, startTileX, startTileY, k_TileChunkWidth, k_TileChunkHeight);
}
return(tileChunk);
}