留个档，Unity Navigation. 动态创建NavMesh，动态Bake NavMesh, 动态烘培NavMesh

运行时，动态创建NavMesh，动态Bake NavMesh, 动态烘培NavMesh

根据unity官方的demo，解析一下，发现动态创建NavMesh导航并不难.
其实只需要 网格信息，还有 需要创建的范围即可。
可以认为是固定公式了
简化写法如下，是不是需要缓存某些信息，就看具体逻辑实现了

using UnityEngine;
using UnityEngine.AI;
using System.Collections.Generic;
using NavMeshBuilder = UnityEngine.AI.NavMeshBuilder;


public class NavMeshHelper : MonoBehaviour
{
    private NavMeshDataInstance m_NavMeshDataInstance;

    private void OnDestroy()
    {
        m_NavMeshDataInstance.Remove();
    }

    public void CreateNavMesh(List listMesh, int nSizeX, int nSizeY, int nSizeZ)
    {
        List listBuildSource = new List();
        if (listMesh != null && listMesh.Count > 0)
        {
            for (int i = 0; i < listMesh.Count; i++)
            {
                var s = new NavMeshBuildSource();
                s.shape = NavMeshBuildSourceShape.Mesh;
                s.sourceObject = listMesh[i];
                s.transform = Matrix4x4.identity;
                s.area = 0;
                listBuildSource.Add(s);
            }
        }
        var v3Size = new Vector3(nSizeX, nSizeY, nSizeZ);
        var bounds = new Bounds(Quantize(transform.position, 0.1f * v3Size), v3Size);
        var nmd = new NavMeshData();
        m_NavMeshDataInstance = NavMesh.AddNavMeshData(nmd);

        var defaultBuildSettings = NavMesh.GetSettingsByID(0);
        NavMeshBuilder.UpdateNavMeshData(nmd, defaultBuildSettings, listBuildSource, bounds);
    }

    private Vector3 Quantize(Vector3 v, Vector3 quant)
    {
        float x = quant.x * Mathf.Floor(v.x / quant.x);
        float y = quant.y * Mathf.Floor(v.y / quant.y);
        float z = quant.z * Mathf.Floor(v.z / quant.z);
        return new Vector3(x, y, z);
    }

}

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