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Assets/NavMeshComponents/Scripts/NavMeshSurface.cs

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+using System.Collections.Generic;
+#if UNITY_EDITOR
+using UnityEditor;
+using UnityEditor.SceneManagement;
+#endif
+
+namespace UnityEngine.AI
+{
+    public enum CollectObjects
+    {
+        All = 0,
+        Volume = 1,
+        Children = 2,
+    }
+
+    [ExecuteAlways]
+    [DefaultExecutionOrder(-102)]
+    [AddComponentMenu("Navigation/NavMeshSurface", 30)]
+    [HelpURL("https://github.com/Unity-Technologies/NavMeshComponents#documentation-draft")]
+    public class NavMeshSurface : MonoBehaviour
+    {
+        [SerializeField]
+        int m_AgentTypeID;
+        public int agentTypeID { get { return m_AgentTypeID; } set { m_AgentTypeID = value; } }
+
+        [SerializeField]
+        CollectObjects m_CollectObjects = CollectObjects.All;
+        public CollectObjects collectObjects { get { return m_CollectObjects; } set { m_CollectObjects = value; } }
+
+        [SerializeField]
+        Vector3 m_Size = new Vector3(10.0f, 10.0f, 10.0f);
+        public Vector3 size { get { return m_Size; } set { m_Size = value; } }
+
+        [SerializeField]
+        Vector3 m_Center = new Vector3(0, 2.0f, 0);
+        public Vector3 center { get { return m_Center; } set { m_Center = value; } }
+
+        [SerializeField]
+        LayerMask m_LayerMask = ~0;
+        public LayerMask layerMask { get { return m_LayerMask; } set { m_LayerMask = value; } }
+
+        [SerializeField]
+        NavMeshCollectGeometry m_UseGeometry = NavMeshCollectGeometry.RenderMeshes;
+        public NavMeshCollectGeometry useGeometry { get { return m_UseGeometry; } set { m_UseGeometry = value; } }
+
+        [SerializeField]
+        int m_DefaultArea;
+        public int defaultArea { get { return m_DefaultArea; } set { m_DefaultArea = value; } }
+
+        [SerializeField]
+        bool m_IgnoreNavMeshAgent = true;
+        public bool ignoreNavMeshAgent { get { return m_IgnoreNavMeshAgent; } set { m_IgnoreNavMeshAgent = value; } }
+
+        [SerializeField]
+        bool m_IgnoreNavMeshObstacle = true;
+        public bool ignoreNavMeshObstacle { get { return m_IgnoreNavMeshObstacle; } set { m_IgnoreNavMeshObstacle = value; } }
+
+        [SerializeField]
+        bool m_OverrideTileSize;
+        public bool overrideTileSize { get { return m_OverrideTileSize; } set { m_OverrideTileSize = value; } }
+        [SerializeField]
+        int m_TileSize = 256;
+        public int tileSize { get { return m_TileSize; } set { m_TileSize = value; } }
+        [SerializeField]
+        bool m_OverrideVoxelSize;
+        public bool overrideVoxelSize { get { return m_OverrideVoxelSize; } set { m_OverrideVoxelSize = value; } }
+        [SerializeField]
+        float m_VoxelSize;
+        public float voxelSize { get { return m_VoxelSize; } set { m_VoxelSize = value; } }
+
+        // Currently not supported advanced options
+        [SerializeField]
+        bool m_BuildHeightMesh;
+        public bool buildHeightMesh { get { return m_BuildHeightMesh; } set { m_BuildHeightMesh = value; } }
+
+        // Reference to whole scene navmesh data asset.
+        [UnityEngine.Serialization.FormerlySerializedAs("m_BakedNavMeshData")]
+        [SerializeField]
+        NavMeshData m_NavMeshData;
+        public NavMeshData navMeshData { get { return m_NavMeshData; } set { m_NavMeshData = value; } }
+
+        // Do not serialize - runtime only state.
+        NavMeshDataInstance m_NavMeshDataInstance;
+        Vector3 m_LastPosition = Vector3.zero;
+        Quaternion m_LastRotation = Quaternion.identity;
+
+        static readonly List<NavMeshSurface> s_NavMeshSurfaces = new List<NavMeshSurface>();
+
+        public static List<NavMeshSurface> activeSurfaces
+        {
+            get { return s_NavMeshSurfaces; }
+        }
+
+        void OnEnable()
+        {
+            Register(this);
+            AddData();
+        }
+
+        void OnDisable()
+        {
+            RemoveData();
+            Unregister(this);
+        }
+
+        public void AddData()
+        {
+#if UNITY_EDITOR
+            var isInPreviewScene = EditorSceneManager.IsPreviewSceneObject(this);
+            var isPrefab = isInPreviewScene || EditorUtility.IsPersistent(this);
+            if (isPrefab)
+            {
+                //Debug.LogFormat("NavMeshData from {0}.{1} will not be added to the NavMesh world because the gameObject is a prefab.",
+                //    gameObject.name, name);
+                return;
+            }
+#endif
+            if (m_NavMeshDataInstance.valid)
+                return;
+
+            if (m_NavMeshData != null)
+            {
+                m_NavMeshDataInstance = NavMesh.AddNavMeshData(m_NavMeshData, transform.position, transform.rotation);
+                m_NavMeshDataInstance.owner = this;
+            }
+
+            m_LastPosition = transform.position;
+            m_LastRotation = transform.rotation;
+        }
+
+        public void RemoveData()
+        {
+            m_NavMeshDataInstance.Remove();
+            m_NavMeshDataInstance = new NavMeshDataInstance();
+        }
+
+        public NavMeshBuildSettings GetBuildSettings()
+        {
+            var buildSettings = NavMesh.GetSettingsByID(m_AgentTypeID);
+            if (buildSettings.agentTypeID == -1)
+            {
+                Debug.LogWarning("No build settings for agent type ID " + agentTypeID, this);
+                buildSettings.agentTypeID = m_AgentTypeID;
+            }
+
+            if (overrideTileSize)
+            {
+                buildSettings.overrideTileSize = true;
+                buildSettings.tileSize = tileSize;
+            }
+            if (overrideVoxelSize)
+            {
+                buildSettings.overrideVoxelSize = true;
+                buildSettings.voxelSize = voxelSize;
+            }
+            return buildSettings;
+        }
+
+        public void BuildNavMesh()
+        {
+            var sources = CollectSources();
+
+            // Use unscaled bounds - this differs in behaviour from e.g. collider components.
+            // But is similar to reflection probe - and since navmesh data has no scaling support - it is the right choice here.
+            var sourcesBounds = new Bounds(m_Center, Abs(m_Size));
+            if (m_CollectObjects == CollectObjects.All || m_CollectObjects == CollectObjects.Children)
+            {
+                sourcesBounds = CalculateWorldBounds(sources);
+            }
+
+            var data = NavMeshBuilder.BuildNavMeshData(GetBuildSettings(),
+                    sources, sourcesBounds, transform.position, transform.rotation);
+
+            if (data != null)
+            {
+                data.name = gameObject.name;
+                RemoveData();
+                m_NavMeshData = data;
+                if (isActiveAndEnabled)
+                    AddData();
+            }
+        }
+
+        public AsyncOperation UpdateNavMesh(NavMeshData data)
+        {
+            var sources = CollectSources();
+
+            // Use unscaled bounds - this differs in behaviour from e.g. collider components.
+            // But is similar to reflection probe - and since navmesh data has no scaling support - it is the right choice here.
+            var sourcesBounds = new Bounds(m_Center, Abs(m_Size));
+            if (m_CollectObjects == CollectObjects.All || m_CollectObjects == CollectObjects.Children)
+                sourcesBounds = CalculateWorldBounds(sources);
+
+            return NavMeshBuilder.UpdateNavMeshDataAsync(data, GetBuildSettings(), sources, sourcesBounds);
+        }
+
+        static void Register(NavMeshSurface surface)
+        {
+#if UNITY_EDITOR
+            var isInPreviewScene = EditorSceneManager.IsPreviewSceneObject(surface);
+            var isPrefab = isInPreviewScene || EditorUtility.IsPersistent(surface);
+            if (isPrefab)
+            {
+                //Debug.LogFormat("NavMeshData from {0}.{1} will not be added to the NavMesh world because the gameObject is a prefab.",
+                //    surface.gameObject.name, surface.name);
+                return;
+            }
+#endif
+            if (s_NavMeshSurfaces.Count == 0)
+                NavMesh.onPreUpdate += UpdateActive;
+
+            if (!s_NavMeshSurfaces.Contains(surface))
+                s_NavMeshSurfaces.Add(surface);
+        }
+
+        static void Unregister(NavMeshSurface surface)
+        {
+            s_NavMeshSurfaces.Remove(surface);
+
+            if (s_NavMeshSurfaces.Count == 0)
+                NavMesh.onPreUpdate -= UpdateActive;
+        }
+
+        static void UpdateActive()
+        {
+            for (var i = 0; i < s_NavMeshSurfaces.Count; ++i)
+                s_NavMeshSurfaces[i].UpdateDataIfTransformChanged();
+        }
+
+        void AppendModifierVolumes(ref List<NavMeshBuildSource> sources)
+        {
+#if UNITY_EDITOR
+            var myStage = StageUtility.GetStageHandle(gameObject);
+            if (!myStage.IsValid())
+                return;
+#endif
+            // Modifiers
+            List<NavMeshModifierVolume> modifiers;
+            if (m_CollectObjects == CollectObjects.Children)
+            {
+                modifiers = new List<NavMeshModifierVolume>(GetComponentsInChildren<NavMeshModifierVolume>());
+                modifiers.RemoveAll(x => !x.isActiveAndEnabled);
+            }
+            else
+            {
+                modifiers = NavMeshModifierVolume.activeModifiers;
+            }
+
+            foreach (var m in modifiers)
+            {
+                if ((m_LayerMask & (1 << m.gameObject.layer)) == 0)
+                    continue;
+                if (!m.AffectsAgentType(m_AgentTypeID))
+                    continue;
+#if UNITY_EDITOR
+                if (!myStage.Contains(m.gameObject))
+                    continue;
+#endif
+                var mcenter = m.transform.TransformPoint(m.center);
+                var scale = m.transform.lossyScale;
+                var msize = new Vector3(m.size.x * Mathf.Abs(scale.x), m.size.y * Mathf.Abs(scale.y), m.size.z * Mathf.Abs(scale.z));
+
+                var src = new NavMeshBuildSource();
+                src.shape = NavMeshBuildSourceShape.ModifierBox;
+                src.transform = Matrix4x4.TRS(mcenter, m.transform.rotation, Vector3.one);
+                src.size = msize;
+                src.area = m.area;
+                sources.Add(src);
+            }
+        }
+
+        List<NavMeshBuildSource> CollectSources()
+        {
+            var sources = new List<NavMeshBuildSource>();
+            var markups = new List<NavMeshBuildMarkup>();
+
+            List<NavMeshModifier> modifiers;
+            if (m_CollectObjects == CollectObjects.Children)
+            {
+                modifiers = new List<NavMeshModifier>(GetComponentsInChildren<NavMeshModifier>());
+                modifiers.RemoveAll(x => !x.isActiveAndEnabled);
+            }
+            else
+            {
+                modifiers = NavMeshModifier.activeModifiers;
+            }
+
+            foreach (var m in modifiers)
+            {
+                if ((m_LayerMask & (1 << m.gameObject.layer)) == 0)
+                    continue;
+                if (!m.AffectsAgentType(m_AgentTypeID))
+                    continue;
+                var markup = new NavMeshBuildMarkup();
+                markup.root = m.transform;
+                markup.overrideArea = m.overrideArea;
+                markup.area = m.area;
+                markup.ignoreFromBuild = m.ignoreFromBuild;
+                markups.Add(markup);
+            }
+
+#if UNITY_EDITOR
+            if (!EditorApplication.isPlaying)
+            {
+                if (m_CollectObjects == CollectObjects.All)
+                {
+                    UnityEditor.AI.NavMeshBuilder.CollectSourcesInStage(
+                        null, m_LayerMask, m_UseGeometry, m_DefaultArea, markups, gameObject.scene, sources);
+                }
+                else if (m_CollectObjects == CollectObjects.Children)
+                {
+                    UnityEditor.AI.NavMeshBuilder.CollectSourcesInStage(
+                        transform, m_LayerMask, m_UseGeometry, m_DefaultArea, markups, gameObject.scene, sources);
+                }
+                else if (m_CollectObjects == CollectObjects.Volume)
+                {
+                    Matrix4x4 localToWorld = Matrix4x4.TRS(transform.position, transform.rotation, Vector3.one);
+                    var worldBounds = GetWorldBounds(localToWorld, new Bounds(m_Center, m_Size));
+
+                    UnityEditor.AI.NavMeshBuilder.CollectSourcesInStage(
+                        worldBounds, m_LayerMask, m_UseGeometry, m_DefaultArea, markups, gameObject.scene, sources);
+                }
+            }
+            else
+#endif
+            {
+                if (m_CollectObjects == CollectObjects.All)
+                {
+                    NavMeshBuilder.CollectSources(null, m_LayerMask, m_UseGeometry, m_DefaultArea, markups, sources);
+                }
+                else if (m_CollectObjects == CollectObjects.Children)
+                {
+                    NavMeshBuilder.CollectSources(transform, m_LayerMask, m_UseGeometry, m_DefaultArea, markups, sources);
+                }
+                else if (m_CollectObjects == CollectObjects.Volume)
+                {
+                    Matrix4x4 localToWorld = Matrix4x4.TRS(transform.position, transform.rotation, Vector3.one);
+                    var worldBounds = GetWorldBounds(localToWorld, new Bounds(m_Center, m_Size));
+                    NavMeshBuilder.CollectSources(worldBounds, m_LayerMask, m_UseGeometry, m_DefaultArea, markups, sources);
+                }
+            }
+
+            if (m_IgnoreNavMeshAgent)
+                sources.RemoveAll((x) => (x.component != null && x.component.gameObject.GetComponent<NavMeshAgent>() != null));
+
+            if (m_IgnoreNavMeshObstacle)
+                sources.RemoveAll((x) => (x.component != null && x.component.gameObject.GetComponent<NavMeshObstacle>() != null));
+
+            AppendModifierVolumes(ref sources);
+
+            return sources;
+        }
+
+        static Vector3 Abs(Vector3 v)
+        {
+            return new Vector3(Mathf.Abs(v.x), Mathf.Abs(v.y), Mathf.Abs(v.z));
+        }
+
+        static Bounds GetWorldBounds(Matrix4x4 mat, Bounds bounds)
+        {
+            var absAxisX = Abs(mat.MultiplyVector(Vector3.right));
+            var absAxisY = Abs(mat.MultiplyVector(Vector3.up));
+            var absAxisZ = Abs(mat.MultiplyVector(Vector3.forward));
+            var worldPosition = mat.MultiplyPoint(bounds.center);
+            var worldSize = absAxisX * bounds.size.x + absAxisY * bounds.size.y + absAxisZ * bounds.size.z;
+            return new Bounds(worldPosition, worldSize);
+        }
+
+        Bounds CalculateWorldBounds(List<NavMeshBuildSource> sources)
+        {
+            // Use the unscaled matrix for the NavMeshSurface
+            Matrix4x4 worldToLocal = Matrix4x4.TRS(transform.position, transform.rotation, Vector3.one);
+            worldToLocal = worldToLocal.inverse;
+
+            var result = new Bounds();
+            foreach (var src in sources)
+            {
+                switch (src.shape)
+                {
+                    case NavMeshBuildSourceShape.Mesh:
+                    {
+                        var m = src.sourceObject as Mesh;
+                        result.Encapsulate(GetWorldBounds(worldToLocal * src.transform, m.bounds));
+                        break;
+                    }
+                    case NavMeshBuildSourceShape.Terrain:
+                    {
+                        // Terrain pivot is lower/left corner - shift bounds accordingly
+                        var t = src.sourceObject as TerrainData;
+                        result.Encapsulate(GetWorldBounds(worldToLocal * src.transform, new Bounds(0.5f * t.size, t.size)));
+                        break;
+                    }
+                    case NavMeshBuildSourceShape.Box:
+                    case NavMeshBuildSourceShape.Sphere:
+                    case NavMeshBuildSourceShape.Capsule:
+                    case NavMeshBuildSourceShape.ModifierBox:
+                        result.Encapsulate(GetWorldBounds(worldToLocal * src.transform, new Bounds(Vector3.zero, src.size)));
+                        break;
+                }
+            }
+            // Inflate the bounds a bit to avoid clipping co-planar sources
+            result.Expand(0.1f);
+            return result;
+        }
+
+        bool HasTransformChanged()
+        {
+            if (m_LastPosition != transform.position) return true;
+            if (m_LastRotation != transform.rotation) return true;
+            return false;
+        }
+
+        void UpdateDataIfTransformChanged()
+        {
+            if (HasTransformChanged())
+            {
+                RemoveData();
+                AddData();
+            }
+        }
+
+#if UNITY_EDITOR
+        bool UnshareNavMeshAsset()
+        {
+            // Nothing to unshare
+            if (m_NavMeshData == null)
+                return false;
+
+            // Prefab parent owns the asset reference
+            var isInPreviewScene = EditorSceneManager.IsPreviewSceneObject(this);
+            var isPersistentObject = EditorUtility.IsPersistent(this);
+            if (isInPreviewScene || isPersistentObject)
+                return false;
+
+            // An instance can share asset reference only with its prefab parent
+            var prefab = UnityEditor.PrefabUtility.GetCorrespondingObjectFromSource(this) as NavMeshSurface;
+            if (prefab != null && prefab.navMeshData == navMeshData)
+                return false;
+
+            // Don't allow referencing an asset that's assigned to another surface
+            for (var i = 0; i < s_NavMeshSurfaces.Count; ++i)
+            {
+                var surface = s_NavMeshSurfaces[i];
+                if (surface != this && surface.m_NavMeshData == m_NavMeshData)
+                    return true;
+            }
+
+            // Asset is not referenced by known surfaces
+            return false;
+        }
+
+        void OnValidate()
+        {
+            if (UnshareNavMeshAsset())
+            {
+                Debug.LogWarning("Duplicating NavMeshSurface does not duplicate the referenced navmesh data", this);
+                m_NavMeshData = null;
+            }
+
+            var settings = NavMesh.GetSettingsByID(m_AgentTypeID);
+            if (settings.agentTypeID != -1)
+            {
+                // When unchecking the override control, revert to automatic value.
+                const float kMinVoxelSize = 0.01f;
+                if (!m_OverrideVoxelSize)
+                    m_VoxelSize = settings.agentRadius / 3.0f;
+                if (m_VoxelSize < kMinVoxelSize)
+                    m_VoxelSize = kMinVoxelSize;
+
+                // When unchecking the override control, revert to default value.
+                const int kMinTileSize = 16;
+                const int kMaxTileSize = 1024;
+                const int kDefaultTileSize = 256;
+
+                if (!m_OverrideTileSize)
+                    m_TileSize = kDefaultTileSize;
+                // Make sure tilesize is in sane range.
+                if (m_TileSize < kMinTileSize)
+                    m_TileSize = kMinTileSize;
+                if (m_TileSize > kMaxTileSize)
+                    m_TileSize = kMaxTileSize;
+            }
+        }
+#endif
+    }
+}