Initial commit

Assets/Procedural Worlds/Gaia/Scripts/MaskSystem/BakedMaskCache.cs

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+using System;
+using System.Linq;
+using UnityEditor;
+using UnityEngine;
+#if HDPipeline
+using UnityEngine.Rendering.HighDefinition;
+#endif
+
+namespace Gaia
+{
+    [System.Serializable]
+    public class BakedMaskCacheEntry
+    {
+        public string fileName;
+        public string assetPath;
+        public string fullPath;
+        public RenderTexture texture;
+    }
+
+    [System.Serializable]
+    public class BakedMaskCache : UnityEngine.Object
+    {
+        public bool m_autoSpawnRunning = false;
+        //bool m_cacheClearedForAutoSpawn = false;
+        public GaiaSession m_gaiaSession;
+        public GaiaSessionManager m_gaiaSessionManager;
+        private Terrain m_worldMapTerrain;
+
+        public BakedMaskCacheEntry[] m_cacheEntries
+        {
+            get
+            {
+                if (m_gaiaSession == null)
+                {
+                    m_gaiaSession = GaiaSessionManager.GetSessionManager(false).m_session;
+                }
+                return m_gaiaSession.m_bakedMaskCacheEntries;
+            }
+            set
+            {
+                if (m_gaiaSession == null)
+                {
+                    m_gaiaSession = GaiaSessionManager.GetSessionManager(false).m_session;
+                }
+                m_gaiaSession.m_bakedMaskCacheEntries = value;
+            }
+        }
+
+
+        public RenderTexture BakeTerrainTagCollisions(Terrain terrain, string tag, float radius)
+        {
+            GameObject[] allGOsWithTag = new GameObject[0];
+
+            bool tagFound = false;
+            try
+            {
+                allGOsWithTag = GameObject.FindGameObjectsWithTag(tag);
+                tagFound = true;
+            }
+            catch
+            {
+                tagFound = false;
+            }
+
+            if (!tagFound)
+            {
+                Debug.LogWarning("Could not find Game Objects for tag: " + tag + " when trying to bake a collision mask. Does this tag exist?");
+                return null;
+            }
+
+
+            //Array to store all positions and radi of the objects
+            Vector4[] posAndRad = new Vector4[allGOsWithTag.Length];
+            for (int i = 0; i < allGOsWithTag.Length; i++)
+            {
+                //need scalar position on the terrain from 0..1
+                //start with the actual center of the object - the transform.position is at the pivot which is not necessarily the center of the object.
+                Vector3 centerPosition = GetCenterAverage(allGOsWithTag[i].transform);
+
+
+                //get relative positon on the terrain first
+                float scaleFactor = (allGOsWithTag[i].transform.localScale.x + allGOsWithTag[i].transform.localScale.z) / 2f;
+                Vector4 v4 = new Vector4(centerPosition.x, centerPosition.y, centerPosition.z, WorldDistance2UVDistance(terrain, radius * scaleFactor));
+                v4.x -= terrain.transform.position.x;
+                v4.y -= terrain.transform.position.y;
+                v4.z -= terrain.transform.position.z;
+                //now make that relative position scalar (0..1)
+                v4.x /= terrain.terrainData.size.x;
+                v4.y /= terrain.terrainData.size.y;
+                v4.z /= terrain.terrainData.size.z;
+                //flip on z-axis
+                v4.z = 1 - v4.z;
+
+                posAndRad[i] = v4;
+            }
+
+            string fileName = GetTagCollisionMaskFileName(terrain, tag, radius);
+
+            return BakeVectorArrayForTerrain(posAndRad, terrain, fileName);
+        }
+
+        private Vector3 GetCenterAverage(Transform transform)
+        {
+            int childCount = transform.childCount;
+            if (childCount == 0)
+            {
+                return transform.position;
+            }
+            else
+            {
+                Vector3 returnVector = Vector3.zero;
+                for (int i = 0; i < childCount; i++)
+                {
+                    returnVector += GetCenterAverage(transform.GetChild(i));
+                }
+                returnVector /= childCount;
+                return returnVector;
+            }
+        }
+
+        public void WriteCacheToDisk()
+        {
+#if UNITY_EDITOR
+
+            int length = m_cacheEntries.Length;
+            for (int i = 0; i < length; i++)
+            {
+                ImageProcessing.WriteRenderTexture(m_cacheEntries[i].fullPath, m_cacheEntries[i].texture);
+
+                //Refresh mask immediately by reimporting it in the same step
+                AssetDatabase.ImportAsset(m_cacheEntries[i].assetPath, ImportAssetOptions.ForceUpdate);
+
+                m_cacheEntries[i].texture = null;
+
+            }
+
+            //clear the cache for a clean start, this will free the cache from outdated entries, etc.
+            //the cache will be rebuilt quickly only with the relevant files which are saved to disk now.
+            m_cacheEntries = new BakedMaskCacheEntry[0];
+#endif
+        }
+
+        public RenderTexture BakeTerrainWorldBiomeMask(Terrain terrain, string worldBiomeMaskGUID)
+        {
+            if (m_gaiaSessionManager == null)
+            {
+                m_gaiaSessionManager = GaiaSessionManager.GetSessionManager(false);
+            }
+            if (m_worldMapTerrain == null)
+            {
+                m_worldMapTerrain = TerrainHelper.GetWorldMapTerrain();
+            }
+            if (m_worldMapTerrain == null)
+            {
+                Debug.LogWarning("Found no world map terrain for baking a world biome mask.");
+                return null;
+            }
+            if (String.IsNullOrEmpty(worldBiomeMaskGUID))
+            {
+                return null;
+            }
+
+            if (m_gaiaSessionManager.m_session == null)
+            {
+                Debug.LogWarning("Found no session for baking a world biome mask.");
+                return null;
+            }
+
+            if (m_gaiaSessionManager.m_session.m_worldBiomeMaskSettings == null)
+            {
+                Debug.LogWarning("Found no world designer settings in the session for baking a world biome mask.");
+                return null;
+            }
+
+            //we need to apply the mask stack for this biome mask on the world map to get the result, then copy the appropiate rectangle for the queried terrain into the cache & return it.
+            bool worldMapActiveState = m_worldMapTerrain.gameObject.activeInHierarchy;
+            m_worldMapTerrain.gameObject.SetActive(true);
+            GameObject emptyGO = new GameObject();
+            emptyGO.transform.position = new Vector3(m_worldMapTerrain.transform.position.x + m_worldMapTerrain.terrainData.size.x / 2f, m_worldMapTerrain.transform.position.y, m_worldMapTerrain.transform.position.z + +m_worldMapTerrain.terrainData.size.z / 2f);
+            GaiaMultiTerrainOperation operation = new GaiaMultiTerrainOperation(m_worldMapTerrain, emptyGO.transform, m_worldMapTerrain.terrainData.size.x);
+            operation.m_isWorldMapOperation = true;
+            operation.GetHeightmap();
+            operation.GetNormalmap();
+            operation.CollectTerrainBakedMasks();
+            RenderTextureDescriptor rtDescriptor = operation.RTbakedMask.descriptor;
+
+            RenderTexture inputTexture = RenderTexture.GetTemporary(rtDescriptor);
+
+            RenderTexture currentRT = RenderTexture.active;
+            RenderTexture.active = inputTexture;
+            GL.Clear(true, true, Color.white);
+            RenderTexture.active = currentRT;
+            RenderTexture ruleOutputTexture = RenderTexture.GetTemporary(rtDescriptor);
+
+            ImageMask[] maskStack = m_gaiaSessionManager.m_session.m_worldBiomeMaskSettings.m_spawnerRules.Find(x => x.GUID == worldBiomeMaskGUID).m_imageMasks;
+
+            //Calculate Target position &/ resolution
+            BoundsDouble bounds = new BoundsDouble();
+            TerrainHelper.GetTerrainBounds(ref bounds);
+            bounds.center -= TerrainLoaderManager.Instance.GetOrigin();
+            RenderTexture chunkContent = new RenderTexture(terrain.terrainData.heightmapTexture.descriptor);
+            int maxTilesX = Mathf.RoundToInt((float)bounds.size.x / terrain.terrainData.size.x);
+            int maxTilesZ = Mathf.RoundToInt((float)bounds.size.z / terrain.terrainData.size.z);
+            int currentTileX = Mathf.RoundToInt((terrain.transform.position.x - (float)bounds.min.x) / terrain.terrainData.size.x);
+            int currentTileZ = Mathf.RoundToInt((terrain.transform.position.z - (float)bounds.min.z) / terrain.terrainData.size.z);
+            float res = (terrain.terrainData.heightmapResolution) / ((float)bounds.size.x / terrain.terrainData.bounds.size.x * (terrain.terrainData.heightmapResolution - 1));
+
+
+            Bounds worldSpaceBounds = terrain.terrainData.bounds;
+            worldSpaceBounds.center = new Vector3(worldSpaceBounds.center.x + terrain.transform.position.x, worldSpaceBounds.center.y + terrain.transform.position.y, worldSpaceBounds.center.z + terrain.transform.position.z);
+            float xPos = ((float)currentTileX * terrain.terrainData.heightmapResolution) / (maxTilesX * terrain.terrainData.heightmapResolution);
+            float zPos = ((float)currentTileZ * terrain.terrainData.heightmapResolution) / (maxTilesZ * terrain.terrainData.heightmapResolution);
+            Vector2 pos = new Vector2(xPos, zPos);
+
+            //If we have a mask stack, we need to process it
+            if (maskStack != null && maskStack.Length > 0)
+            {
+
+                //We start from a white texture, so we need the first mask action in the stack to always be "Multiply", otherwise there will be no result.
+                maskStack[0].m_blendMode = ImageMaskBlendMode.Multiply;
+
+                float maxWorldHeight = 0f;
+                float minWorldHeight = 0f;
+                m_gaiaSessionManager.GetWorldMinMax(ref minWorldHeight, ref maxWorldHeight, true);
+
+                //Iterate through all image masks and set up the current paint context in case the shader uses heightmap data
+                foreach (ImageMask mask in maskStack)
+                {
+                    mask.m_multiTerrainOperation = operation;
+                    mask.m_seaLevel = m_gaiaSessionManager.GetSeaLevel(true);
+                    mask.m_maxWorldHeight = maxWorldHeight;
+                    mask.m_minWorldHeight = minWorldHeight;
+                }
+
+                Graphics.Blit(ImageProcessing.ApplyMaskStack(inputTexture, ruleOutputTexture, maskStack, ImageMaskInfluence.Local), ruleOutputTexture);
+            }
+            else
+            {
+                //no mask stack -> just blit the white input texture over as the output
+                Graphics.Blit(inputTexture, ruleOutputTexture);
+            }
+            operation.CloseOperation();
+            DestroyImmediate(emptyGO);
+            RenderTexture.ReleaseTemporary(inputTexture);
+            m_worldMapTerrain.gameObject.SetActive(worldMapActiveState);
+
+            //copy the rule output into the right size for the requested terrain chunk
+            Graphics.Blit(ruleOutputTexture, chunkContent, new Vector2(res, res), pos);
+
+            string filename = GetWorldBiomeMaskFilename(terrain, worldBiomeMaskGUID);
+            SaveBakedMaskInCache(chunkContent, terrain, filename);
+
+            RenderTexture.ReleaseTemporary(ruleOutputTexture);
+
+            return chunkContent;
+        }
+
+        public RenderTexture BakeLayerGameObjectCollisions(Terrain terrain, LayerMask layerMask, float distance)
+        {
+            //Set up the scene for the layer mask bake. Do all this in a try catch so we can clean up in case anything goes wrong.
+            RenderTexture collisionMask = OrthoLayerBake(terrain, layerMask, distance);
+
+            string fileName = GetLayerGameObjectCollisionMaskFileName(terrain, layerMask, distance);
+            SaveBakedMaskInCache(collisionMask, terrain, fileName);
+
+            return collisionMask;
+        }
+
+        private RenderTexture OrthoLayerBake(Terrain terrain, LayerMask layerMask, float distance)
+        {
+            RenderTextureDescriptor rtDesc = GetDefaultCollisionMaskRTDescriptor(terrain);
+            RenderTexture collisionMask = new RenderTexture(rtDesc);
+            RenderTexture currentRT = RenderTexture.active;
+            RenderTexture.active = collisionMask;
+            //we start with a full white texture, the areas that would create a collision are painted in black
+            GL.Clear(true, true, Color.white);
+            RenderTexture.active = currentRT;
+            var originalLODBias = QualitySettings.lodBias;
+            try
+            {
+#if HDPipeline
+                //In HD Pipeline we can use a frame override to set the LOD Bias for the capture.
+                OrthographicBake.m_HDLODBiasOverride = 100;
+#else
+                QualitySettings.lodBias = 100;
+#endif
+                OrthographicBake.LightsOff();
+                OrthographicBake.CreateBakeDirectionalLight(9999f, Color.white);
+                OrthographicBake.BakeTerrain(terrain, terrain.terrainData.heightmapResolution, terrain.terrainData.heightmapResolution, layerMask, null);
+                Material growShrinkMaterial = new Material(Shader.Find("Hidden/Gaia/GrowShrink"));
+                growShrinkMaterial.SetTexture("_InputTex", OrthographicBake.m_tmpRenderTexture);
+                //translate the grow shrink distance into a scalar terrain value, as the shader works with U/V coordinates
+                float scalarDistance = distance / terrain.terrainData.size.x;
+                growShrinkMaterial.SetFloat("_Distance", scalarDistance);
+                growShrinkMaterial.SetFloat("_TexelSize", OrthographicBake.m_tmpRenderTexture.texelSize.x);
+                Graphics.Blit(OrthographicBake.m_tmpRenderTexture, collisionMask, growShrinkMaterial, 1);
+                OrthographicBake.CleanUpRenderTexture();
+
+            }
+            catch (Exception ex)
+            {
+                Debug.LogError("Error while trying to bake a layer-based game object collision mask. Error Message: " + ex.Message + " Stack Trace: " + ex.StackTrace);
+            }
+            finally
+            {
+#if !HDPipeline
+                QualitySettings.lodBias = originalLODBias;
+#endif
+
+                OrthographicBake.LightsOn();
+                OrthographicBake.RemoveBakeDirectionalLight();
+                OrthographicBake.RemoveOrthoCam();
+            }
+            return collisionMask;
+        }
+
+        private RenderTexture BakeLayerTreeCollisions(Terrain terrain, LayerMask layerMask, float growShrinkDistance)
+        {
+            bool originalHeightmapEnabled = terrain.drawHeightmap;
+            bool[] originalChildEnabledStates = new bool[terrain.transform.childCount];
+            for (int i = 0; i < terrain.transform.childCount; i++)
+            {
+                originalChildEnabledStates[i] = terrain.transform.GetChild(i).gameObject.activeInHierarchy;
+            }
+
+            RenderTexture collisionMask = null;
+            try
+            {
+                //Add in the layer of the terrain to the layer selection - needs to be visible for the ortho bake so the trees show up in the baked image
+                int terrainlayerbits = 1 << terrain.gameObject.layer;
+                layerMask = layerMask | terrainlayerbits;
+
+                terrain.drawHeightmap = false;
+                for (int i = 0; i < terrain.transform.childCount; i++)
+                {
+                    terrain.transform.GetChild(i).gameObject.SetActive(false);
+                }
+                collisionMask = OrthoLayerBake(terrain, layerMask, growShrinkDistance);
+                string fileName = GetLayerTreeCollisionMaskFileName(terrain, layerMask, growShrinkDistance);
+                SaveBakedMaskInCache(collisionMask, terrain, fileName);
+
+            }
+            catch (Exception ex)
+            {
+                Debug.LogError("Error while trying to bake a layer-based tree collision mask. Error Message: " + ex.Message + " Stack Trace: " + ex.StackTrace);
+            }
+            finally
+            {
+                terrain.drawHeightmap = originalHeightmapEnabled;
+                for (int i = 0; i < terrain.transform.childCount; i++)
+                {
+                    terrain.transform.GetChild(i).gameObject.SetActive(originalChildEnabledStates[i]);
+                }
+
+            }
+            return collisionMask;
+        }
+
+
+        public RenderTexture BakeTerrainTreeCollisions(Terrain terrain, int treePrototypeId, string spawnRuleGUID, float boundsRadius)
+        {
+            //Iterate through the trees and build a v4 array with the positions
+
+            TreeInstance[] allRelevantTrees = terrain.terrainData.treeInstances.Where(x => x.prototypeIndex == treePrototypeId).ToArray();
+            //Array to store all positions and radi of the tree
+            Vector4[] posAndRad = new Vector4[allRelevantTrees.Length];
+
+            for (int i = 0; i < allRelevantTrees.Length; i++)
+            {
+                //note the flip on the z-axis
+                posAndRad[i] = new Vector4(allRelevantTrees[i].position.x, allRelevantTrees[i].position.y, 1 - allRelevantTrees[i].position.z, WorldDistance2UVDistance(terrain, boundsRadius * allRelevantTrees[i].widthScale));
+            }
+
+            string fileName = GetTreeCollisionMaskFileName(terrain, spawnRuleGUID, boundsRadius);
+
+            return BakeVectorArrayForTerrain(posAndRad, terrain, fileName);
+
+        }
+
+        /// <summary>
+        /// Converts a regular world space unity unit distance to a distance in scalar (0-1) UV-space on a terrain.
+        /// </summary>
+        /// <param name="Terrain">The terrain on which the conversion takes place</param>
+        /// <param name="distance">The distance to convert.</param>
+        /// <returns></returns>
+        private float WorldDistance2UVDistance(Terrain terrain, float distance)
+        {
+            float longerSideLength = Mathf.Max(terrain.terrainData.size.x, terrain.terrainData.size.z);
+            return Mathf.InverseLerp(0, longerSideLength, distance);
+        }
+
+        private RenderTexture BakeVectorArrayForTerrain(Vector4[] posAndRad, Terrain terrain, string filename)
+        {
+            //setting up with default settings from the paint context source render texture
+            RenderTextureDescriptor rtDesc = GetDefaultCollisionMaskRTDescriptor(terrain);
+
+            RenderTexture collisionMask = new RenderTexture(rtDesc);
+            RenderTexture currentRT = RenderTexture.active;
+            RenderTexture.active = collisionMask;
+            //we start with a full white texture, the areas that would create a collision are painted in black
+            GL.Clear(true, true, Color.white);
+            RenderTexture.active = currentRT;
+
+            //We need a buffer texture to continously feed the output of the tree collision baking back into the shader.
+            //while still iterating through the trees.
+            RenderTexture collisionMaskBuffer = RenderTexture.GetTemporary(collisionMask.descriptor);
+            //Clear the buffer for a clean start
+            Graphics.Blit(collisionMask, collisionMaskBuffer);
+            //Prepare a material that will bake the trees into a mask as we spawn them
+            Material treeBakeMat = new Material(Shader.Find("Hidden/Gaia/TreeCollisionMaskBaking"));
+            //treeBakeMat.SetFloat("_Strength", 1f);
+            //AnimationCurve tempCurve = new AnimationCurve(new Keyframe[] { new Keyframe { time = 0, value = 1 }, new Keyframe { time = 1, value = 0 } });
+            //Texture2D tempTexture = new Texture2D(256, 1);
+            //ImageProcessing.CreateMaskCurveTexture(ref tempTexture);
+            //ImageProcessing.BakeCurveTexture(tempCurve, tempTexture);
+            //treeBakeMat.SetTexture("_DistanceMaskTex", tempTexture);
+
+            //treeBakeMat.SetInt("_Invert", 0);
+            //
+            int currentPosNumber = 0;
+            while (currentPosNumber < posAndRad.Length)
+            {
+                int segmentLength = Math.Min(1000, posAndRad.Length - currentPosNumber);
+                Vector4[] segment = new Vector4[segmentLength];
+                Array.Copy(posAndRad, Math.Max(0, currentPosNumber - 1), segment, 0, segmentLength);
+                treeBakeMat.SetTexture("_InputTex", collisionMaskBuffer);
+                treeBakeMat.SetVectorArray("_TargetPosition", segment);
+                treeBakeMat.SetInt("_PositionsCount", segmentLength);
+                Graphics.Blit(collisionMaskBuffer, collisionMask, treeBakeMat, 2);
+                Graphics.Blit(collisionMask, collisionMaskBuffer);
+                currentPosNumber += segmentLength;
+            }
+            ////Iterate through the trees and bake
+            //foreach (Vector4 v4 in posAndRad)
+            //{
+
+            //    //treeBakeMat.SetVector("_TargetPosition", new Vector4(v4.x, v4.z, 0, 0));
+            //    treeBakeMat.SetTexture("_InputTex", collisionMaskBuffer);
+            //    Graphics.Blit(collisionMaskBuffer, collisionMask, treeBakeMat, 2);
+            //    Graphics.Blit(collisionMask, collisionMaskBuffer);
+            //}
+
+            //Store the final result in the appropiate file
+
+            SaveBakedMaskInCache(collisionMask, terrain, filename);
+            //Clean Up
+            //DestroyImmediate(tempTexture);
+            //tempTexture = null;
+            //RenderTexture.ReleaseTemporary(collisionMask);
+            RenderTexture.ReleaseTemporary(collisionMaskBuffer);
+            return collisionMask;
+        }
+
+        private RenderTextureDescriptor GetDefaultCollisionMaskRTDescriptor(Terrain terrain)
+        {
+            RenderTextureDescriptor rtDesc = new RenderTextureDescriptor();
+            rtDesc.autoGenerateMips = true;
+            rtDesc.bindMS = false;
+            rtDesc.colorFormat = RenderTextureFormat.R16;
+            rtDesc.depthBufferBits = 0;
+            rtDesc.dimension = UnityEngine.Rendering.TextureDimension.Tex2D;
+            rtDesc.enableRandomWrite = true;
+            rtDesc.graphicsFormat = UnityEngine.Experimental.Rendering.GraphicsFormat.R16_UNorm;
+            rtDesc.height = Mathf.RoundToInt(terrain.terrainData.size.z);
+            rtDesc.memoryless = RenderTextureMemoryless.None;
+            rtDesc.msaaSamples = 1;
+            rtDesc.sRGB = false;
+            rtDesc.shadowSamplingMode = UnityEngine.Rendering.ShadowSamplingMode.None;
+            rtDesc.useDynamicScale = false;
+            rtDesc.useMipMap = false;
+            rtDesc.volumeDepth = 1;
+            rtDesc.vrUsage = VRTextureUsage.None;
+            rtDesc.width = Mathf.RoundToInt(terrain.terrainData.size.x);
+            return rtDesc;
+        }
+
+        private string GetTreeCollisionMaskFileName(Terrain terrain, string spawnRuleGUID, float radius)
+        {
+            return terrain.name + "_" + BakedMaskTypeInternal.RadiusTree.ToString() + "_" + spawnRuleGUID + "_" + radius.ToString();
+        }
+
+        private string GetTreeCollisionMaskSearchString(string spawnRuleGUID)
+        {
+            return BakedMaskTypeInternal.RadiusTree.ToString() + "_" + spawnRuleGUID.ToString();
+        }
+
+        private string GetLayerGameObjectCollisionMaskFileName(Terrain terrain, LayerMask layerMask, float distance)
+        {
+            return terrain.name + "_" + BakedMaskTypeInternal.LayerGameObject.ToString() + "_" + layerMask.value.ToString() + "_" + distance.ToString();
+        }
+
+        private string GetLayerTreeCollisionMaskFileName(Terrain terrain, LayerMask layerMask, float distance)
+        {
+            return terrain.name + "_" + BakedMaskTypeInternal.LayerTree.ToString() + "_" + layerMask.value.ToString() + "_" + distance.ToString();
+        }
+
+        private string GetTagCollisionMaskFileName(Terrain terrain, string m_tag, float radius)
+        {
+            return terrain.name + "_" + BakedMaskTypeInternal.RadiusTag.ToString() + "_" + m_tag + "_" + radius.ToString();
+        }
+
+        private LayerMask GetLayerMaskFromFileName(string fileName)
+        {
+            string masktypeName = "";
+            if (fileName.Contains(BakedMaskTypeInternal.LayerGameObject.ToString()))
+            {
+                masktypeName = BakedMaskTypeInternal.LayerGameObject.ToString();
+            }
+            if (fileName.Contains(BakedMaskTypeInternal.LayerTree.ToString()))
+            {
+                masktypeName = BakedMaskTypeInternal.LayerTree.ToString();
+            }
+            if (masktypeName == "")
+            {
+                return -1;
+            }
+
+            string layerMaskString = fileName.Substring(fileName.IndexOf(masktypeName) + masktypeName.Length + 1);
+            layerMaskString = layerMaskString.Substring(0, layerMaskString.LastIndexOf("_"));
+
+            try
+            {
+                int parsedInt = -1;
+                int.TryParse(layerMaskString, out parsedInt);
+                LayerMask layerMask = parsedInt;
+                return layerMask;
+            }
+            catch (Exception ex)
+            {
+                Debug.LogError("could not reset a cached collision layer mask, tried to use the following layer mask string: " + layerMaskString);
+                //workaround to avoid warning in the compiler
+                if (ex.Message == "")
+                {
+
+                }
+                return -1;
+            }
+
+        }
+
+        private string GetTagCollisionMaskSearchString(string tag)
+        {
+            return BakedMaskTypeInternal.RadiusTag.ToString() + "_" + tag;
+        }
+
+        private string GetWorldBiomeMaskFilename(Terrain terrain, string GUID)
+        {
+            return terrain.name + "_" + BakedMaskTypeInternal.WorldBiomeMask.ToString() + "_" + GUID;
+        }
+
+        private string GetWorldBiomeMaskSearchString(string GUID)
+        {
+            return BakedMaskTypeInternal.WorldBiomeMask.ToString() + "_" + GUID;
+        }
+
+        private void SaveBakedMaskInCache(RenderTexture renderTexture, Terrain terrain, string fileName)
+        {
+            if (m_cacheEntries == null)
+            {
+                m_cacheEntries = new BakedMaskCacheEntry[0];
+            }
+
+            //Convert the RT
+            //Texture2D texture = GaiaUtils.ConvertRenderTextureToTexture2D(renderTexture);
+
+            //texture.name = fileName;
+
+            //Check if there is an entry already
+            int length = m_cacheEntries.Length;
+            bool found = false;
+            for (int i = 0; i < length; i++)
+            {
+                if (m_cacheEntries[i].fileName == fileName)
+                {
+                    //found an entry, update with new render texture
+                    found = true;
+                    if (m_cacheEntries[i].texture != null)
+                    {
+                        m_cacheEntries[i].texture.Release();
+                        DestroyImmediate(m_cacheEntries[i].texture);
+                    }
+                    WriteCacheEntry(m_cacheEntries[i], renderTexture, terrain, fileName);
+                    break;
+                }
+            }
+
+            //Not found? Need to append cache array and write the new entry at the end
+            if (!found)
+            {
+                AddNewCollisionMaskCacheEntry(renderTexture, terrain, fileName);
+            }
+
+
+        }
+
+        private void AddNewCollisionMaskCacheEntry(RenderTexture texture, Terrain terrain, string fileName)
+        {
+            BakedMaskCacheEntry[] newArray = new BakedMaskCacheEntry[m_cacheEntries.Length + 1];
+            int length2 = m_cacheEntries.Length;
+            for (int i = 0; i < length2; i++)
+            {
+                newArray[i] = m_cacheEntries[i];
+            }
+            newArray[newArray.Length - 1] = new BakedMaskCacheEntry();
+            WriteCacheEntry(newArray[newArray.Length - 1], texture, terrain, fileName);
+            m_cacheEntries = newArray;
+            //EditorUtility.SetDirty(this);
+#if UNITY_EDITOR
+            EditorUtility.SetDirty(GaiaSessionManager.GetSessionManager(false));
+#endif
+        }
+
+        private void WriteCacheEntry(BakedMaskCacheEntry entry, RenderTexture texture, Terrain terrain, string fileName)
+        {
+
+            //build the paths
+            string assetPath = GaiaDirectories.GetTerrainCollisionDirectory(terrain) + "/" + fileName;
+            string fullPath = assetPath.Replace("Assets", Application.dataPath);
+
+            //clear old texture
+            if (entry.texture != null && entry.texture != Texture2D.whiteTexture)
+            {
+                UnityEngine.Object.DestroyImmediate(entry.texture);
+                entry.texture = null;
+            }
+            //overwrite texture contents
+            entry.texture = texture;
+
+            //assign Paths & name
+            entry.fileName = fileName;
+            entry.assetPath = assetPath;
+            entry.fullPath = fullPath;
+        }
+
+        public RenderTexture LoadBakedMask(Terrain terrain, BakedMaskTypeInternal type, CollisionMask collisionMask = null, string worldMaskGUID = "", int treeID = 0) //float radius, int id = 0, string tag = "", string GUID = "")
+        {
+
+            if (m_cacheEntries == null)
+            {
+                m_cacheEntries = new BakedMaskCacheEntry[0];
+            }
+
+            string fileName = "";
+            switch (type)
+            {
+                case BakedMaskTypeInternal.RadiusTree:
+                    fileName = GetTreeCollisionMaskFileName(terrain, collisionMask.m_treeSpawnRuleGUID, collisionMask.m_Radius);
+                    break;
+                case BakedMaskTypeInternal.RadiusTag:
+                    fileName = GetTagCollisionMaskFileName(terrain, collisionMask.m_tag, collisionMask.m_Radius);
+                    break;
+                case BakedMaskTypeInternal.WorldBiomeMask:
+                    fileName = GetWorldBiomeMaskFilename(terrain, worldMaskGUID);
+                    break;
+                case BakedMaskTypeInternal.LayerGameObject:
+                    fileName = GetLayerGameObjectCollisionMaskFileName(terrain, collisionMask.m_layerMask, collisionMask.m_growShrinkDistance);
+                    break;
+                case BakedMaskTypeInternal.LayerTree:
+                    fileName = GetLayerTreeCollisionMaskFileName(terrain, collisionMask.m_layerMask, collisionMask.m_growShrinkDistance);
+                    break;
+                default:
+                    return null;
+            }
+
+            if (fileName != "")
+            {
+                //file in cache? If yes, return from there
+                int length = m_cacheEntries.Length;
+                for (int i = 0; i < length; i++)
+                {
+                    if (m_cacheEntries[i].fileName == fileName)
+                        //does it have a texture as well?
+                        if (m_cacheEntries[i].texture != null)
+                        {
+                            //found it, we can return it & are done
+                            return m_cacheEntries[i].texture;
+                        }
+                }
+
+                //not in cache? We need to bake it then!
+                switch (type)
+                {
+                    case BakedMaskTypeInternal.RadiusTree:
+                        return BakeTerrainTreeCollisions(terrain, treeID, collisionMask.m_treeSpawnRuleGUID, collisionMask.m_Radius);
+                    case BakedMaskTypeInternal.RadiusTag:
+                        return BakeTerrainTagCollisions(terrain, collisionMask.m_tag, collisionMask.m_Radius);
+                    case BakedMaskTypeInternal.WorldBiomeMask:
+                        return BakeTerrainWorldBiomeMask(terrain, worldMaskGUID);
+                    case BakedMaskTypeInternal.LayerGameObject:
+                        return BakeLayerGameObjectCollisions(terrain, collisionMask.m_layerMask, collisionMask.m_growShrinkDistance);
+                    case BakedMaskTypeInternal.LayerTree:
+                        return BakeLayerTreeCollisions(terrain, collisionMask.m_layerMask, collisionMask.m_growShrinkDistance);
+                    default:
+                        return null;
+                }
+
+
+                //not in cache? try reading from disk...
+#if UNITY_EDITOR
+                //Texture2D texture = (Texture2D)AssetDatabase.LoadAssetAtPath(GaiaDirectories.GetTerrainCollisionDirectory(terrain) + "/" + GetTreeCollisionMaskFileName(terrain, id, radius), typeof(Texture2D));
+
+
+                //if (texture != null)
+                //{
+                //    //found it on disk, write a copy of it in cache for next access attempt, then return the copy.
+                //    //We need to work with a copy here because otherwise we can run into issue when trying to overwrite the image file
+                //    Texture2D copy = new Texture2D(texture.width, texture.height, texture.format, true);
+                //    Graphics.CopyTexture(texture, copy);
+                //    AddNewCollisionMaskCacheEntry(copy, terrain, fileName);
+                //    return copy;
+                //}
+#endif
+
+            }
+            else return null;
+
+
+        }
+
+        public void BakeAllLayerGameObjectCollisions(LayerMask layerMask, float growShrinkDistance)
+        {
+            foreach (Terrain t in Terrain.activeTerrains)
+            {
+                BakeLayerGameObjectCollisions(t, layerMask, growShrinkDistance);
+            }
+        }
+
+        public void BakeAllLayerTreeCollisions(LayerMask layerMask, float growShrinkDistance)
+        {
+            foreach (Terrain t in Terrain.activeTerrains)
+            {
+                BakeLayerTreeCollisions(t, layerMask, growShrinkDistance);
+            }
+        }
+
+
+        public void BakeAllTreeCollisions(string spawnRuleGUID, float radius)
+        {
+            SpawnRule sr = CollisionMask.m_allTreeSpawnRules.FirstOrDefault(x => x.GUID == spawnRuleGUID);
+            if (sr == null)
+            {
+                return;
+            }
+
+            foreach (Terrain t in Terrain.activeTerrains)
+            {
+                int treePrototypeID = TerrainHelper.GetTreePrototypeIDFromSpawnRule(sr, t);
+                if (treePrototypeID != -1)
+                {
+                    BakeTerrainTreeCollisions(t, treePrototypeID, spawnRuleGUID, radius);
+                }
+            }
+        }
+
+        public void BakeAllTagCollisions(string m_tag, float m_tagRadius)
+        {
+            foreach (Terrain t in Terrain.activeTerrains)
+            {
+                BakeTerrainTagCollisions(t, m_tag, m_tagRadius);
+            }
+        }
+
+        public void ClearCache()
+        {
+#if UNITY_EDITOR
+
+            int length = m_cacheEntries.Length;
+            for (int i = 0; i < length; i++)
+            {
+                if (m_cacheEntries[i].texture != null)
+                {
+                    m_cacheEntries[i].texture.Release();
+                    //DestroyImmediate(m_cacheEntries[i].texture);
+                    m_cacheEntries[i].texture = null;
+                }
+
+            }
+
+            m_cacheEntries = new BakedMaskCacheEntry[0];
+#endif
+        }
+
+        public void ClearCacheForSpawn()
+        {
+            ClearCache();
+        }
+
+        public void SetWorldBiomeMaskDirty(string worldBiomeMaskGUID)
+        {
+            string searchString = GetWorldBiomeMaskSearchString(worldBiomeMaskGUID);
+            SetDirty(searchString);
+
+        }
+
+        public void SetTreeDirty(string spawnRuleGUID, int layerID)
+        {
+            string searchString = GetTreeCollisionMaskSearchString(spawnRuleGUID);
+            SetDirty(searchString);
+            SetLayerIDDirty(layerID);
+
+        }
+
+        public void SetGameObjectDirty(GameObject gameObject)
+        {
+            if (gameObject.tag != "Untagged")
+            {
+                string searchString = GetTagCollisionMaskSearchString(gameObject.tag);
+                SetDirty(searchString);
+            }
+            SetLayerIDDirty(gameObject.layer);
+        }
+
+
+        private void SetLayerIDDirty(int layerID)
+        {
+            //Iterate through the cached textures, and fish out the ones that fit the layer ID according to the layer mask, then relase them
+            for (int i = 0; i < m_cacheEntries.Length; i++)
+            {
+                LayerMask layerMask = GetLayerMaskFromFileName(m_cacheEntries[i].fileName);
+
+                if (layerMask != -1)
+                {
+                    if ((layerMask & 1 << layerID) != 0)
+                    {
+                        //found the layer in the layer mask, need to release the texture
+                        if (m_cacheEntries[i].texture != null)
+                        {
+                            m_cacheEntries[i].texture.Release();
+                            //DestroyImmediate(m_cacheEntries[i].texture);
+                            m_cacheEntries[i].texture = null;
+                        }
+                    }
+                }
+            }
+        }
+
+        private void SetDirty(string searchString)
+        {
+            //Release the affected render textures
+            for (int i = 0; i < m_cacheEntries.Length; i++)
+            {
+                if (m_cacheEntries[i].fileName.Contains(searchString))
+                {
+                    if (m_cacheEntries[i].texture != null)
+                    {
+                        m_cacheEntries[i].texture.Release();
+                        //DestroyImmediate(m_cacheEntries[i].texture);
+                        m_cacheEntries[i].texture = null;
+                    }
+                }
+            }
+            //Remove the affected array entries
+            m_cacheEntries = m_cacheEntries.Where(x => x.fileName.Contains(searchString) != true).ToArray();
+        }
+
+        //public void BeginAutoSpawn()
+        //{
+        //    m_autoSpawnRunning = true;
+        //    m_cacheClearedForAutoSpawn = false;
+        //}
+
+        //public void EndAutoSpawn()
+        //{
+        //    m_autoSpawnRunning = false;
+        //    m_cacheClearedForAutoSpawn = false;
+        //}
+
+    }
+}