unity 模型沿地表移动工具
让模型在地表移动,
目录结构
/assets/editor

using UnityEngine;using UnityEditor;using System.Collections;/// <summary>/// 模型拖动器/// 1. 地表./// 2. 地图表面./// </summary>public class ModelDragger : EditorWindow{    static readonly string INTRODUCE = "让模型沿地表移动.\n"        +"沿地表:模型的高度为当前地形高度.\n"        +"沿地图:模型高度为,从上面开始.第一个接触到模型的高度";    static readonly string MY_NAME = "模型拖动器";    static readonly string ALONG_TERRAIN = "沿地表拖动:";    static readonly string ALONG_MAP = "沿地图拖动:";    static readonly string ON = "开";    static readonly string OFF = "关";    static readonly string CANT_MOVE_TERRAIN = "地形,不能移动.";    private bool isTerrain;    private bool isMap;    private Terrain curTerrain;    [MenuItem("Level4/Fbx/ModelDragger")]    static void Init()    {        ModelDragger md = EditorWindow.GetWindow<ModelDragger>(false, MY_NAME) as ModelDragger;        md.curTerrain = Terrain.activeTerrain;    }    void OnGUI()    {        GUILayout.Label(INTRODUCE);        //地表        EditorGUILayout.BeginHorizontal("box");        EditorGUILayout.PrefixLabel(ALONG_TERRAIN);        isTerrain = GUILayout.Toggle(isTerrain, isTerrain ? OFF : ON);        if (isTerrain)            isMap = false;        EditorGUILayout.EndHorizontal();        //地图        EditorGUILayout.BeginHorizontal("box");        EditorGUILayout.PrefixLabel(ALONG_MAP);        isMap = GUILayout.Toggle(isMap, isMap ? OFF : ON);        if (isMap)            isTerrain = false;        EditorGUILayout.EndHorizontal();    }    void Update()    {        if (isTerrain)        {            DragAlongTerrain();        }        else if (isMap)        {            DragAlongMap();        }    }    /// <summary>    /// 模型沿地表移动    /// </summary>    void DragAlongTerrain()    {        if (curTerrain != null)        {            foreach (Transform tr in Selection.transforms)            {                if (tr.GetComponent<Terrain>() == null)                    tr.position = new Vector3(tr.position.x, curTerrain.SampleHeight(tr.position), tr.position.z);                else                {                    ShowNotification(new GUIContent(CANT_MOVE_TERRAIN));                    break;                }            }        }    }    /// <summary>    /// 模型沿地图移动.    /// </summary>    void DragAlongMap()    {        foreach (Transform tr in Selection.transforms)        {            if (tr.GetComponent<Terrain>() == null)                FallIt(tr);            else            {                ShowNotification(new GUIContent(CANT_MOVE_TERRAIN));                break;            }        }    }    /// <summary>    /// 物体 向下掉落.    /// </summary>    /// <param name="tr"></param>    void FallIt(Transform tr)    {        Vector3 origin = tr.position;        origin.y += 1000;        Vector3 dir = Vector3.down;        RaycastHit[] hits = Physics.RaycastAll(origin, dir);        Debug.DrawRay(origin,dir*100,Color.red);        foreach (RaycastHit hit in hits)        {            if (hit.transform != tr)            {                tr.position = hit.point;                break;            }        }    }}