RoApp/Assets/MeshBaker/scripts/core/MB3_MultiMeshCombiner.cs

//----------------------------------------------
//            MeshBaker
// Copyright © 2011-2012 Ian Deane
//----------------------------------------------
using UnityEngine;
using System.Collections;
using System.Collections.Specialized;
using System;
using System.Collections.Generic;
using System.Text;
using DigitalOpus.MB.Core;

namespace DigitalOpus.MB.Core
{

    /// <summary>
    /// This class is an endless mesh. You don't need to worry about the 65k limit when adding meshes. It is like a List of combined meshes. Internally it manages
    /// a collection of MB2_MeshComber objects to which meshes added and deleted as necessary. 
    /// 
    /// Note that this implementation does
    /// not attempt to split meshes. Each mesh is added to one of the internal meshes as an atomic unit.
    /// 
    /// This class is not a Component so it can be instantiated and used like a regular C Sharp class.
    /// </summary>
    [System.Serializable]
    public class MB3_MultiMeshCombiner : MB3_MeshCombiner
    {

        [System.Serializable]
        public class CombinedMesh
        {
            public MB3_MeshCombinerSingle combinedMesh;
            public int extraSpace = -1;
            public int numVertsInListToDelete = 0;
            public int numVertsInListToAdd = 0;
            public List<GameObject> gosToAdd;
            public List<int> gosToDelete;
            public List<GameObject> gosToUpdate;
            public bool isDirty = false; //needs apply

            public CombinedMesh(int maxNumVertsInMesh, GameObject resultSceneObject, MB2_LogLevel ll)
            {
                combinedMesh = new MB3_MeshCombinerSingle();
                combinedMesh.resultSceneObject = resultSceneObject;
                combinedMesh.LOG_LEVEL = ll;
                extraSpace = maxNumVertsInMesh;
                numVertsInListToDelete = 0;
                numVertsInListToAdd = 0;
                gosToAdd = new List<GameObject>();
                gosToDelete = new List<int>();
                gosToUpdate = new List<GameObject>();
            }

            public bool isEmpty()
            {
                List<GameObject> obsIn = new List<GameObject>();
                obsIn.AddRange(combinedMesh.GetObjectsInCombined());
                for (int i = 0; i < gosToDelete.Count; i++)
                {
                    for (int j = 0; j < obsIn.Count; j++)
                    {
                        if (obsIn[j].GetInstanceID() == gosToDelete[i])
                        {
                            obsIn.RemoveAt(j);
                            break;
                        }
                    }

                }
                if (obsIn.Count == 0) return true;
                return false;
            }
        }

        static GameObject[] empty = new GameObject[0];
        static int[] emptyIDs = new int[0];

        public override MB2_LogLevel LOG_LEVEL
        {
            get { return _LOG_LEVEL; }
            set
            {
                _LOG_LEVEL = value;
                for (int i = 0; i < meshCombiners.Count; i++)
                {
                    meshCombiners[i].combinedMesh.LOG_LEVEL = value;
                }
            }
        }

        public override MB2_ValidationLevel validationLevel
        {
            set
            {
                _validationLevel = value;
                for (int i = 0; i < meshCombiners.Count; i++)
                {
                    meshCombiners[i].combinedMesh.validationLevel = _validationLevel;
                }
            }
            get { return _validationLevel; }
        }

        public Dictionary<int, CombinedMesh> obj2MeshCombinerMap = new Dictionary<int, CombinedMesh>();
        [SerializeField]
        public List<CombinedMesh> meshCombiners = new List<CombinedMesh>();

        [SerializeField]
        int _maxVertsInMesh = 65535;
        public int maxVertsInMesh
        {
            get { return _maxVertsInMesh; }
            set
            {
                if (obj2MeshCombinerMap.Count > 0)
                {
                    //todo how to warn with gui
                    //Debug.LogError("Can't set the max verts in meshes once there are objects in the mesh.");
                    return;
                }
                else if (value < 3)
                {
                    Debug.LogError("Max verts in mesh must be greater than three.");
                }
                else if (value > MBVersion.MaxMeshVertexCount())
                {
                    Debug.LogError("Meshes in unity cannot have more than " + MBVersion.MaxMeshVertexCount() + " vertices.");
                }
                else
                {
                    _maxVertsInMesh = value;
                }
            }
        }

        public override int GetNumObjectsInCombined()
        {
            return obj2MeshCombinerMap.Count;
        }

        public override int GetNumVerticesFor(GameObject go)
        {
            CombinedMesh c = null;
            if (obj2MeshCombinerMap.TryGetValue(go.GetInstanceID(), out c))
            {
                return c.combinedMesh.GetNumVerticesFor(go);
            }
            else
            {
                return -1;
            }
        }

        public override int GetNumVerticesFor(int gameObjectID)
        {
            CombinedMesh c = null;
            if (obj2MeshCombinerMap.TryGetValue(gameObjectID, out c))
            {
                return c.combinedMesh.GetNumVerticesFor(gameObjectID);
            }
            else
            {
                return -1;
            }
        }

        public override List<GameObject> GetObjectsInCombined()
        { //todo look at getting from keys
            List<GameObject> allObjs = new List<GameObject>();
            for (int i = 0; i < meshCombiners.Count; i++)
            {
                allObjs.AddRange(meshCombiners[i].combinedMesh.GetObjectsInCombined());
            }
            return allObjs;
        }

        public override int GetLightmapIndex()
        { //todo check that all meshcombiners use same lightmap index
            if (meshCombiners.Count > 0) return meshCombiners[0].combinedMesh.GetLightmapIndex();
            return -1;
        }

        public override bool CombinedMeshContains(GameObject go)
        {
            return obj2MeshCombinerMap.ContainsKey(go.GetInstanceID());
        }

        bool _validateTextureBakeResults()
        {
            if (_textureBakeResults == null)
            {
                Debug.LogError("Texture Bake Results is null. Can't combine meshes.");
                return false;
            }
            if ((_textureBakeResults.materialsAndUVRects == null || _textureBakeResults.materialsAndUVRects.Length == 0))
            {
                Debug.LogError("Texture Bake Results has no materials in material to sourceUVRect map. Try baking materials. Can't combine meshes.");
                return false;
            }


            if (_textureBakeResults.resultMaterials == null || _textureBakeResults.resultMaterials.Length == 0)
            {
                Debug.LogError("Texture Bake Results has no result materials. Try baking materials. Can't combine meshes.");
                return false;
            }

            return true;
        }

        public override void Apply(MB3_MeshCombiner.GenerateUV2Delegate uv2GenerationMethod)
        {
            for (int i = 0; i < meshCombiners.Count; i++)
            {
                if (meshCombiners[i].isDirty)
                {
                    meshCombiners[i].combinedMesh.Apply(uv2GenerationMethod);
                    meshCombiners[i].isDirty = false;
                }
            }
        }

        public override void Apply(bool triangles,
                          bool vertices,
                          bool normals,
                          bool tangents,
                          bool uvs,
                          bool uv2,
                          bool uv3,
                          bool uv4,
                          bool colors,
                          bool bones = false,
                          bool blendShapesFlag = false,
                          MB3_MeshCombiner.GenerateUV2Delegate uv2GenerationMethod = null)
        {
            for (int i = 0; i < meshCombiners.Count; i++)
            {
                if (meshCombiners[i].isDirty)
                {
                    meshCombiners[i].combinedMesh.Apply(triangles, vertices, normals, tangents, uvs, uv2, uv3, uv4, colors, bones, blendShapesFlag, uv2GenerationMethod);
                    meshCombiners[i].isDirty = false;
                }
            }
        }

        public override void UpdateSkinnedMeshApproximateBounds()
        {
            for (int i = 0; i < meshCombiners.Count; i++)
            {
                meshCombiners[i].combinedMesh.UpdateSkinnedMeshApproximateBounds();
            }
        }

        public override void UpdateSkinnedMeshApproximateBoundsFromBones()
        {
            for (int i = 0; i < meshCombiners.Count; i++)
            {
                meshCombiners[i].combinedMesh.UpdateSkinnedMeshApproximateBoundsFromBones();
            }
        }

        public override void UpdateSkinnedMeshApproximateBoundsFromBounds()
        {
            for (int i = 0; i < meshCombiners.Count; i++)
            {
                meshCombiners[i].combinedMesh.UpdateSkinnedMeshApproximateBoundsFromBounds();
            }
        }

        public override void UpdateGameObjects(GameObject[] gos, bool recalcBounds = true,
                                             bool updateVertices = true, bool updateNormals = true, bool updateTangents = true,
                                            bool updateUV = false, bool updateUV2 = false, bool updateUV3 = false, bool updateUV4 = false,
                                            bool updateColors = false, bool updateSkinningInfo = false)
        {
            if (gos == null)
            {
                Debug.LogError("list of game objects cannot be null");
                return;
            }

            //build gos lists
            for (int i = 0; i < meshCombiners.Count; i++)
            {
                meshCombiners[i].gosToUpdate.Clear();
            }

            for (int i = 0; i < gos.Length; i++)
            {
                CombinedMesh cm = null;
                obj2MeshCombinerMap.TryGetValue(gos[i].GetInstanceID(), out cm);
                if (cm != null)
                {
                    cm.gosToUpdate.Add(gos[i]);
                }
                else
                {
                    Debug.LogWarning("Object " + gos[i] + " is not in the combined mesh.");
                }
            }

            for (int i = 0; i < meshCombiners.Count; i++)
            {
                if (meshCombiners[i].gosToUpdate.Count > 0)
                {
                    meshCombiners[i].isDirty = true;
                    GameObject[] gosToUpdate = meshCombiners[i].gosToUpdate.ToArray();
                    meshCombiners[i].combinedMesh.UpdateGameObjects(gosToUpdate, recalcBounds, updateVertices, updateNormals, updateTangents, updateUV, updateUV2, updateUV3, updateUV4, updateColors, updateSkinningInfo);
                }
            }
        }

        public override bool AddDeleteGameObjects(GameObject[] gos, GameObject[] deleteGOs, bool disableRendererInSource = true)
        {
            int[] delInstanceIDs = null;
            if (deleteGOs != null)
            {
                delInstanceIDs = new int[deleteGOs.Length];
                for (int i = 0; i < deleteGOs.Length; i++)
                {
                    if (deleteGOs[i] == null)
                    {
                        Debug.LogError("The " + i + "th object on the list of objects to delete is 'Null'");
                    }
                    else
                    {
                        delInstanceIDs[i] = deleteGOs[i].GetInstanceID();
                    }
                }
            }
            return AddDeleteGameObjectsByID(gos, delInstanceIDs, disableRendererInSource);
        }

        public override bool AddDeleteGameObjectsByID(GameObject[] gos, int[] deleteGOinstanceIDs, bool disableRendererInSource = true)
        {
            //Profile.Start//Profile("MB2_MultiMeshCombiner.AddDeleteGameObjects1");
            //PART 1 ==== Validate
            if (_usingTemporaryTextureBakeResult && gos != null && gos.Length > 0)
            {
                MB_Utility.Destroy(_textureBakeResults);
                _textureBakeResults = null;
                _usingTemporaryTextureBakeResult = false;
            }

            //if all objects use the same material we can create a temporary _textureBakeResults 
            if (_textureBakeResults == null && gos != null && gos.Length > 0 && gos[0] != null)
            {
                if (!_CreateTemporaryTextrueBakeResult(gos, GetMaterialsOnTargetRenderer()))
                {
                    return false;
                }
            }

            if (!_validate(gos, deleteGOinstanceIDs))
            {
                return false;
            }
            _distributeAmongBakers(gos, deleteGOinstanceIDs);
            if (LOG_LEVEL >= MB2_LogLevel.debug) MB2_Log.LogDebug("MB2_MultiMeshCombiner.AddDeleteGameObjects numCombinedMeshes: " + meshCombiners.Count + " added:" + gos + " deleted:" + deleteGOinstanceIDs + " disableRendererInSource:" + disableRendererInSource + " maxVertsPerCombined:" + _maxVertsInMesh);
            return _bakeStep1(gos, deleteGOinstanceIDs, disableRendererInSource);
        }

        bool _validate(GameObject[] gos, int[] deleteGOinstanceIDs)
        {
            if (_validationLevel == MB2_ValidationLevel.none) return true;
            if (_maxVertsInMesh < 3) Debug.LogError("Invalid value for maxVertsInMesh=" + _maxVertsInMesh);
            _validateTextureBakeResults();

            if (gos != null)
            {
                for (int i = 0; i < gos.Length; i++)
                {
                    if (gos[i] == null)
                    {
                        Debug.LogError("The " + i + "th object on the list of objects to combine is 'None'. Use Command-Delete on Mac OS X; Delete or Shift-Delete on Windows to remove this one element.");
                        return false;
                    }
                    if (_validationLevel >= MB2_ValidationLevel.robust)
                    {
                        for (int j = i + 1; j < gos.Length; j++)
                        {
                            if (gos[i] == gos[j])
                            {
                                Debug.LogError("GameObject " + gos[i] + "appears twice in list of game objects to add");
                                return false;
                            }
                        }
                        if (obj2MeshCombinerMap.ContainsKey(gos[i].GetInstanceID()))
                        {
                            bool isInDeleteList = false;
                            if (deleteGOinstanceIDs != null)
                            {
                                for (int k = 0; k < deleteGOinstanceIDs.Length; k++)
                                {
                                    if (deleteGOinstanceIDs[k] == gos[i].GetInstanceID()) isInDeleteList = true;
                                }
                            }
                            if (!isInDeleteList)
                            {
                                Debug.LogError("GameObject " + gos[i] + " is already in the combined mesh " + gos[i].GetInstanceID());
                                return false;
                            }
                        }
                    }
                }
            }
            if (deleteGOinstanceIDs != null)
            {
                if (_validationLevel >= MB2_ValidationLevel.robust)
                {
                    for (int i = 0; i < deleteGOinstanceIDs.Length; i++)
                    {
                        for (int j = i + 1; j < deleteGOinstanceIDs.Length; j++)
                        {
                            if (deleteGOinstanceIDs[i] == deleteGOinstanceIDs[j])
                            {
                                Debug.LogError("GameObject " + deleteGOinstanceIDs[i] + "appears twice in list of game objects to delete");
                                return false;
                            }
                        }
                        if (!obj2MeshCombinerMap.ContainsKey(deleteGOinstanceIDs[i]))
                        {
                            Debug.LogWarning("GameObject with instance ID " + deleteGOinstanceIDs[i] + " on the list of objects to delete is not in the combined mesh.");
                        }
                    }
                }
            }
            return true;
        }

        void _distributeAmongBakers(GameObject[] gos, int[] deleteGOinstanceIDs)
        {
            if (gos == null) gos = empty;
            if (deleteGOinstanceIDs == null) deleteGOinstanceIDs = emptyIDs;

            if (resultSceneObject == null) resultSceneObject = new GameObject("CombinedMesh-" + name);

            //PART 2 ==== calculate which bakers to add objects to
            for (int i = 0; i < meshCombiners.Count; i++)
            {
                meshCombiners[i].extraSpace = _maxVertsInMesh - meshCombiners[i].combinedMesh.GetMesh().vertexCount;
            }
            //Profile.End//Profile("MB2_MultiMeshCombiner.AddDeleteGameObjects1");

            //Profile.Start//Profile("MB2_MultiMeshCombiner.AddDeleteGameObjects2.1");		
            //first delete game objects from the existing combinedMeshes keep track of free space
            for (int i = 0; i < deleteGOinstanceIDs.Length; i++)
            {
                CombinedMesh c = null;
                if (obj2MeshCombinerMap.TryGetValue(deleteGOinstanceIDs[i], out c))
                {
                    if (LOG_LEVEL >= MB2_LogLevel.debug) MB2_Log.LogDebug("MB2_MultiMeshCombiner.Removing " + deleteGOinstanceIDs[i] + " from meshCombiner " + meshCombiners.IndexOf(c));
                    c.numVertsInListToDelete += c.combinedMesh.GetNumVerticesFor(deleteGOinstanceIDs[i]);  //m.vertexCount;
                    c.gosToDelete.Add(deleteGOinstanceIDs[i]);
                }
                else
                {
                    Debug.LogWarning("Object " + deleteGOinstanceIDs[i] + " in the list of objects to delete is not in the combined mesh.");
                }
            }
            for (int i = 0; i < gos.Length; i++)
            {
                GameObject go = gos[i];
                int numVerts = MB_Utility.GetMesh(go).vertexCount;
                CombinedMesh cm = null;
                for (int j = 0; j < meshCombiners.Count; j++)
                {
                    if (meshCombiners[j].extraSpace + meshCombiners[j].numVertsInListToDelete - meshCombiners[j].numVertsInListToAdd > numVerts)
                    {
                        cm = meshCombiners[j];
                        if (LOG_LEVEL >= MB2_LogLevel.debug) MB2_Log.LogDebug("MB2_MultiMeshCombiner.Added " + gos[i] + " to combinedMesh " + j, LOG_LEVEL);
                        break;
                    }
                }
                if (cm == null)
                {
                    cm = new CombinedMesh(maxVertsInMesh, _resultSceneObject, _LOG_LEVEL);
                    _setMBValues(cm.combinedMesh);
                    meshCombiners.Add(cm);
                    if (LOG_LEVEL >= MB2_LogLevel.debug) MB2_Log.LogDebug("MB2_MultiMeshCombiner.Created new combinedMesh");
                }
                cm.gosToAdd.Add(go);
                cm.numVertsInListToAdd += numVerts;
                //			obj2MeshCombinerMap.Add(go,cm);
            }
        }

        bool _bakeStep1(GameObject[] gos, int[] deleteGOinstanceIDs, bool disableRendererInSource)
        {
            //Profile.End//Profile("MB2_MultiMeshCombiner.AddDeleteGameObjects2.2");	
            //Profile.Start//Profile("MB2_MultiMeshCombiner.AddDeleteGameObjects3"); 
            //PART 3 ==== Add delete meshes from combined
            for (int i = 0; i < meshCombiners.Count; i++)
            {
                CombinedMesh cm = meshCombiners[i];
                if (cm.combinedMesh.targetRenderer == null)
                {
                    cm.combinedMesh.resultSceneObject = _resultSceneObject;
                    cm.combinedMesh.BuildSceneMeshObject(gos, true);
                    if (_LOG_LEVEL >= MB2_LogLevel.debug) MB2_Log.LogDebug("BuildSO combiner {0} goID {1} targetRenID {2} meshID {3}", i, cm.combinedMesh.targetRenderer.gameObject.GetInstanceID(), cm.combinedMesh.targetRenderer.GetInstanceID(), cm.combinedMesh.GetMesh().GetInstanceID());

                }
                else
                {
                    if (cm.combinedMesh.targetRenderer.transform.parent != resultSceneObject.transform)
                    {
                        Debug.LogError("targetRender objects must be children of resultSceneObject");
                        return false;
                    }
                }
                if (cm.gosToAdd.Count > 0 || cm.gosToDelete.Count > 0)
                {
                    cm.combinedMesh.AddDeleteGameObjectsByID(cm.gosToAdd.ToArray(), cm.gosToDelete.ToArray(), disableRendererInSource);
                    if (_LOG_LEVEL >= MB2_LogLevel.debug) MB2_Log.LogDebug("Baked combiner {0} obsAdded {1} objsRemoved {2} goID {3} targetRenID {4} meshID {5}", i, cm.gosToAdd.Count, cm.gosToDelete.Count, cm.combinedMesh.targetRenderer.gameObject.GetInstanceID(), cm.combinedMesh.targetRenderer.GetInstanceID(), cm.combinedMesh.GetMesh().GetInstanceID());
                }
                Renderer r = cm.combinedMesh.targetRenderer;
                Mesh m = cm.combinedMesh.GetMesh();
                if (r is MeshRenderer)
                {
                    MeshFilter mf = r.gameObject.GetComponent<MeshFilter>();
                    mf.sharedMesh = m;
                }
                else
                {
                    SkinnedMeshRenderer smr = (SkinnedMeshRenderer)r;
                    smr.sharedMesh = m;
                }
            }
            for (int i = 0; i < meshCombiners.Count; i++)
            {
                CombinedMesh cm = meshCombiners[i];
                for (int j = 0; j < cm.gosToDelete.Count; j++)
                {
                    obj2MeshCombinerMap.Remove(cm.gosToDelete[j]);
                }
            }
            for (int i = 0; i < meshCombiners.Count; i++)
            {
                CombinedMesh cm = meshCombiners[i];
                for (int j = 0; j < cm.gosToAdd.Count; j++)
                {
                    obj2MeshCombinerMap.Add(cm.gosToAdd[j].GetInstanceID(), cm);
                }
                if (cm.gosToAdd.Count > 0 || cm.gosToDelete.Count > 0)
                {
                    cm.gosToDelete.Clear();
                    cm.gosToAdd.Clear();
                    cm.numVertsInListToDelete = 0;
                    cm.numVertsInListToAdd = 0;
                    cm.isDirty = true;
                }
            }
            //Profile.End//Profile("MB2_MultiMeshCombiner.AddDeleteGameObjects3"); 
            if (LOG_LEVEL >= MB2_LogLevel.debug)
            {
                string s = "Meshes in combined:";
                for (int i = 0; i < meshCombiners.Count; i++)
                {
                    s += " mesh" + i + "(" + meshCombiners[i].combinedMesh.GetObjectsInCombined().Count + ")\n";
                }
                s += "children in result: " + resultSceneObject.transform.childCount;
                MB2_Log.LogDebug(s, LOG_LEVEL);
            }
            if (meshCombiners.Count > 0)
            {
                return true;
            }
            else
            {
                return false;
            }
        }

        public override Dictionary<MBBlendShapeKey, MBBlendShapeValue> BuildSourceBlendShapeToCombinedIndexMap()
        {
            Dictionary<MBBlendShapeKey, MBBlendShapeValue> map = new Dictionary<MBBlendShapeKey, MBBlendShapeValue>();
            for (int combinerIdx = 0; combinerIdx < meshCombiners.Count; combinerIdx++)
            {
                for (int i = 0; i < meshCombiners[combinerIdx].combinedMesh.blendShapes.Length; i++)
                {
                    MB3_MeshCombinerSingle.MBBlendShape bs = meshCombiners[combinerIdx].combinedMesh.blendShapes[i];
                    MBBlendShapeValue bsv = new MBBlendShapeValue();
                    bsv.combinedMeshGameObject = meshCombiners[combinerIdx].combinedMesh.targetRenderer.gameObject;
                    bsv.blendShapeIndex = i;
                    map.Add(new MBBlendShapeKey(bs.gameObjectID, bs.indexInSource), bsv);
                }
            }
            return map;
        }

        public override void ClearBuffers()
        {
            for (int i = 0; i < meshCombiners.Count; i++)
            {
                meshCombiners[i].combinedMesh.ClearBuffers();
            }
            obj2MeshCombinerMap.Clear();
        }

        public override void ClearMesh()
        {
            DestroyMesh();
        }

        public override void DestroyMesh()
        {
            for (int i = 0; i < meshCombiners.Count; i++)
            {
                if (meshCombiners[i].combinedMesh.targetRenderer != null)
                {
                    MB_Utility.Destroy(meshCombiners[i].combinedMesh.targetRenderer.gameObject);
                }
                meshCombiners[i].combinedMesh.ClearMesh();
            }
            obj2MeshCombinerMap.Clear();
            meshCombiners.Clear();
        }

        public override void DestroyMeshEditor(MB2_EditorMethodsInterface editorMethods)
        {
            for (int i = 0; i < meshCombiners.Count; i++)
            {
                if (meshCombiners[i].combinedMesh.targetRenderer != null)
                {
                    editorMethods.Destroy(meshCombiners[i].combinedMesh.targetRenderer.gameObject);
                }
                meshCombiners[i].combinedMesh.ClearMesh();
            }
            obj2MeshCombinerMap.Clear();
            meshCombiners.Clear();
        }

        void _setMBValues(MB3_MeshCombinerSingle targ)
        {
            targ.validationLevel = _validationLevel;
            targ.renderType = renderType;
            targ.outputOption = MB2_OutputOptions.bakeIntoSceneObject;
            targ.lightmapOption = lightmapOption;
            targ.textureBakeResults = textureBakeResults;
            targ.doNorm = doNorm;
            targ.doTan = doTan;
            targ.doCol = doCol;
            targ.doUV = doUV;
            targ.doUV3 = doUV3;
            targ.doUV4 = doUV4;
            targ.doBlendShapes = doBlendShapes;
            targ.optimizeAfterBake = optimizeAfterBake;
            targ.recenterVertsToBoundsCenter = recenterVertsToBoundsCenter;
            targ.uv2UnwrappingParamsHardAngle = uv2UnwrappingParamsHardAngle;
            targ.uv2UnwrappingParamsPackMargin = uv2UnwrappingParamsPackMargin;

        }

        public override List<Material> GetMaterialsOnTargetRenderer()
        {
            HashSet<Material> hs = new HashSet<Material>();
            for (int i = 0; i < meshCombiners.Count; i++)
            {
                hs.UnionWith(meshCombiners[i].combinedMesh.GetMaterialsOnTargetRenderer());
            }
            List<Material> outMats = new List<Material>(hs);
            return outMats;
        }

        public override void CheckIntegrity()
        {
            if (!MB_Utility.DO_INTEGRITY_CHECKS) return;
            for (int i = 0; i < meshCombiners.Count; i++)
            {
                meshCombiners[i].combinedMesh.CheckIntegrity();
            }
        }
    }
}