diff --git a/src/Common/Flags.h b/src/Common/Flags.h
index bf8554e6..491488b0 100644
--- a/src/Common/Flags.h
+++ b/src/Common/Flags.h
@@ -32,6 +32,10 @@ public:
     inline bool HasFlag(FlagEnum Flag) const    { return ((mValue & Flag) != 0); }
     inline bool HasAnyFlags(TFlags Flags) const { return ((mValue & Flags) != 0); }
     inline bool HasAllFlags(TFlags Flags) const { return ((mValue & Flags) == Flags); }
+    inline void SetFlag(FlagEnum Flag)          { mValue |= Flag; }
+    inline void SetFlag(TFlags Flags)           { mValue |= Flags; }
+    inline void ClearFlag(FlagEnum Flag)        { mValue &= ~Flag; }
+    inline void ClearFlag(TFlags Flags)         { mValue &= ~Flags; }
 };
 #define DECLARE_FLAGS(Enum, FlagTypeName) typedef TFlags<Enum> FlagTypeName;
 
diff --git a/src/Common/TString.h b/src/Common/TString.h
index f933151c..25bbb160 100644
--- a/src/Common/TString.h
+++ b/src/Common/TString.h
@@ -212,7 +212,7 @@ public:
     inline void Insert(u32 Pos, CharType Chr)
     {
 #ifdef _DEBUG
-        if (Size() <= Pos)
+        if (Size() < Pos)
             throw std::out_of_range("Invalid position passed to TBasicString::Insert()");
 #endif
         mInternalString.insert(Pos, 1, Chr);
@@ -221,7 +221,7 @@ public:
     inline void Insert(u32 Pos, const CharType* pkStr)
     {
 #ifdef _DEBUG
-        if (Size() <= Pos)
+        if (Size() < Pos)
             throw std::out_of_range("Invalid position passed to TBasicString::Insert()");
 #endif
         mInternalString.insert(Pos, pkStr);
@@ -846,7 +846,10 @@ public:
 
     static TBasicString<CharType> FromFloat(float Value, int MinDecimals = 1)
     {
-        _TString Out = std::to_string(Value);
+        std::basic_stringstream<CharType> sstream;
+        sstream << Value;
+        _TString Out = sstream.str();
+
         int NumZeroes = Out.Size() - (Out.IndexOf(LITERAL(".")) + 1);
 
         while (Out.Back() == CHAR_LITERAL('0') && NumZeroes > MinDecimals)
diff --git a/src/Core/Core.pro b/src/Core/Core.pro
index a6573d17..251c321b 100644
--- a/src/Core/Core.pro
+++ b/src/Core/Core.pro
@@ -196,7 +196,10 @@ HEADERS += \
     GameProject/CResourceStore.h \
     GameProject/CVirtualDirectory.h \
     GameProject/CResourceEntry.h \
-    GameProject/CResourceIterator.h
+    GameProject/CResourceIterator.h \
+    Resource/CDependencyGroup.h \
+    Resource/Factory/CDependencyGroupLoader.h \
+    GameProject/CDependencyTree.h
 
 # Source Files
 SOURCES += \
@@ -287,4 +290,6 @@ SOURCES += \
     GameProject/CResourceStore.cpp \
     GameProject/CVirtualDirectory.cpp \
     GameProject/CResourceEntry.cpp \
-    GameProject/CPackage.cpp
+    GameProject/CPackage.cpp \
+    Resource/Factory/CDependencyGroupLoader.cpp \
+    GameProject/CDependencyTree.cpp
diff --git a/src/Core/GameProject/CDependencyTree.cpp b/src/Core/GameProject/CDependencyTree.cpp
new file mode 100644
index 00000000..e433fb0c
--- /dev/null
+++ b/src/Core/GameProject/CDependencyTree.cpp
@@ -0,0 +1,320 @@
+#include "CDependencyTree.h"
+#include "Core/Resource/Script/CScriptLayer.h"
+#include "Core/Resource/Script/CScriptObject.h"
+
+// ************ CResourceDependency ************
+EDependencyNodeType CResourceDependency::Type() const
+{
+    return eDNT_ResourceDependency;
+}
+
+void CResourceDependency::Read(IInputStream& rFile, EUIDLength IDLength)
+{
+    mID = CUniqueID(rFile, IDLength);
+}
+
+void CResourceDependency::Write(IOutputStream& rFile, EUIDLength IDLength) const
+{
+    if (IDLength == e32Bit)
+        rFile.WriteLong(mID.ToLong());
+    else
+        rFile.WriteLongLong(mID.ToLongLong());
+}
+
+// ************ CAnimSetDependency ************
+EDependencyNodeType CAnimSetDependency::Type() const
+{
+    return eDNT_AnimSet;
+}
+
+void CAnimSetDependency::Read(IInputStream& rFile, EUIDLength IDLength)
+{
+    CResourceDependency::Read(rFile, IDLength);
+    mUsedChar = rFile.ReadLong();
+}
+
+void CAnimSetDependency::Write(IOutputStream& rFile, EUIDLength IDLength) const
+{
+    CResourceDependency::Write(rFile, IDLength);
+    rFile.WriteLong(mUsedChar);
+}
+
+// Static
+CAnimSetDependency* CAnimSetDependency::BuildDependency(TCharacterProperty *pProp)
+{
+    ASSERT(pProp && pProp->Type() == eCharacterProperty && pProp->Instance()->Area()->Game() <= eEchoes);
+
+    CAnimationParameters Params = pProp->Get();
+    if (!Params.ID().IsValid()) return nullptr;
+
+    CAnimSetDependency *pDepend = new CAnimSetDependency;
+    pDepend->SetID(Params.ID());
+    pDepend->SetUsedChar(Params.CharacterIndex());
+    return pDepend;
+}
+
+// ************ CDependencyTree ************
+CDependencyTree::~CDependencyTree()
+{
+    for (u32 iRef = 0; iRef < mReferencedResources.size(); iRef++)
+        delete mReferencedResources[iRef];
+}
+
+EDependencyNodeType CDependencyTree::Type() const
+{
+    return eDNT_Root;
+}
+
+void CDependencyTree::Read(IInputStream& rFile, EUIDLength IDLength)
+{
+    mID = CUniqueID(rFile, IDLength);
+
+    u32 NumDepends = rFile.ReadLong();
+    mReferencedResources.reserve(NumDepends);
+
+    for (u32 iDep = 0; iDep < NumDepends; iDep++)
+    {
+        CResourceDependency *pDepend = new CResourceDependency;
+        pDepend->Read(rFile, IDLength);
+        mReferencedResources.push_back(pDepend);
+    }
+}
+
+void CDependencyTree::Write(IOutputStream& rFile, EUIDLength IDLength) const
+{
+    if (IDLength == e32Bit)
+        rFile.WriteLong(mID.ToLong());
+    else
+        rFile.WriteLongLong(mID.ToLongLong());
+
+    rFile.WriteLong( mReferencedResources.size() );
+
+    for (u32 iDep = 0; iDep < mReferencedResources.size(); iDep++)
+        mReferencedResources[iDep]->Write(rFile, IDLength);
+}
+
+u32 CDependencyTree::NumDependencies() const
+{
+    return mReferencedResources.size();
+}
+
+bool CDependencyTree::HasDependency(const CUniqueID& rkID)
+{
+    for (u32 iDep = 0; iDep < mReferencedResources.size(); iDep++)
+    {
+        if (mReferencedResources[iDep]->ID() == rkID)
+            return true;
+    }
+
+    return false;
+}
+
+CUniqueID CDependencyTree::DependencyByIndex(u32 Index) const
+{
+    ASSERT(Index >= 0 && Index < mReferencedResources.size());
+    return mReferencedResources[Index]->ID();
+}
+
+void CDependencyTree::AddDependency(CResource *pRes)
+{
+    if (!pRes || HasDependency(pRes->ResID())) return;
+    CResourceDependency *pDepend = new CResourceDependency(pRes->ResID());
+    mReferencedResources.push_back(pDepend);
+}
+
+void CDependencyTree::AddDependency(const CUniqueID& rkID)
+{
+    if (!rkID.IsValid() || HasDependency(rkID)) return;
+    CResourceDependency *pDepend = new CResourceDependency(rkID);
+    mReferencedResources.push_back(pDepend);
+}
+
+// ************ CAnimSetDependencyTree ************
+EDependencyNodeType CAnimSetDependencyTree::Type() const
+{
+    return eDNT_AnimSet;
+}
+
+void CAnimSetDependencyTree::Read(IInputStream& rFile, EUIDLength IDLength)
+{
+    CDependencyTree::Read(rFile, IDLength);
+    u32 NumChars = rFile.ReadLong();
+    mCharacterOffsets.reserve(NumChars);
+
+    for (u32 iChar = 0; iChar < NumChars; iChar++)
+        mCharacterOffsets.push_back( rFile.ReadLong() );
+}
+
+void CAnimSetDependencyTree::Write(IOutputStream& rFile, EUIDLength IDLength) const
+{
+    CDependencyTree::Write(rFile, IDLength);
+    rFile.WriteLong(mCharacterOffsets.size());
+
+    for (u32 iChar = 0; iChar < mCharacterOffsets.size(); iChar++)
+        rFile.WriteLong( mCharacterOffsets[iChar] );
+}
+
+// ************ CScriptInstanceDependencyTree ************
+CScriptInstanceDependencyTree::~CScriptInstanceDependencyTree()
+{
+    for (u32 iDep = 0; iDep < mDependencies.size(); iDep++)
+        delete mDependencies[iDep];
+}
+
+EDependencyNodeType CScriptInstanceDependencyTree::Type() const
+{
+    return eDNT_ScriptInstance;
+}
+
+void CScriptInstanceDependencyTree::Read(IInputStream& rFile, EUIDLength IDLength)
+{
+    mObjectType = rFile.ReadLong();
+    u32 NumDepends = rFile.ReadLong();
+    mDependencies.reserve(NumDepends);
+
+    for (u32 iDep = 0; iDep < NumDepends; iDep++)
+    {
+        CUniqueID ID(rFile, IDLength);
+        CResourceEntry *pEntry = gpResourceStore->FindEntry(ID);
+
+        if (pEntry && pEntry->ResourceType() == eAnimSet && pEntry->Game() <= eEchoes)
+        {
+            CAnimSetDependency *pSet = new CAnimSetDependency();
+            pSet->SetID(ID);
+            pSet->SetUsedChar( rFile.ReadLong() );
+            mDependencies.push_back(pSet);
+        }
+
+        else
+        {
+            CResourceDependency *pRes = new CResourceDependency(ID);
+            mDependencies.push_back(pRes);
+        }
+    }
+}
+
+void CScriptInstanceDependencyTree::Write(IOutputStream& rFile, EUIDLength IDLength) const
+{
+    rFile.WriteLong(mObjectType);
+    rFile.WriteLong(mDependencies.size());
+
+    for (u32 iDep = 0; iDep < mDependencies.size(); iDep++)
+        mDependencies[iDep]->Write(rFile, IDLength);
+}
+
+bool CScriptInstanceDependencyTree::HasDependency(const CUniqueID& rkID)
+{
+    if (!rkID.IsValid()) return false;
+
+    for (u32 iDep = 0; iDep < mDependencies.size(); iDep++)
+    {
+        CResourceDependency *pDep = mDependencies[iDep];
+        if (pDep->ID() == rkID) return true;
+    }
+
+    return false;
+}
+
+// Static
+CScriptInstanceDependencyTree* CScriptInstanceDependencyTree::BuildTree(CScriptObject *pInstance)
+{
+    CScriptInstanceDependencyTree *pTree = new CScriptInstanceDependencyTree();
+    pTree->mObjectType = pInstance->ObjectTypeID();
+    ParseStructDependencies(pTree, pInstance->Properties());
+    return pTree;
+}
+
+void CScriptInstanceDependencyTree::ParseStructDependencies(CScriptInstanceDependencyTree *pTree, CPropertyStruct *pStruct)
+{
+    for (u32 iProp = 0; iProp < pStruct->Count(); iProp++)
+    {
+        IProperty *pProp = pStruct->PropertyByIndex(iProp);
+
+        if (pProp->Type() == eStructProperty || pProp->Type() == eArrayProperty)
+            ParseStructDependencies(pTree, static_cast<CPropertyStruct*>(pProp));
+
+        else if (pProp->Type() == eFileProperty)
+        {
+            CUniqueID ID = static_cast<TFileProperty*>(pProp)->Get().ID();
+
+            if (ID.IsValid() && !pTree->HasDependency(ID))
+            {
+                CResourceDependency *pDep = new CResourceDependency(ID);
+                pTree->mDependencies.push_back(pDep);
+            }
+        }
+
+        else if (pProp->Type() == eCharacterProperty)
+        {
+            TCharacterProperty *pChar = static_cast<TCharacterProperty*>(pProp);
+            CUniqueID ID = pChar->Get().ID();
+
+            if (ID.IsValid() && !pTree->HasDependency(ID))
+                pTree->mDependencies.push_back( CAnimSetDependency::BuildDependency(pChar) );
+        }
+    }
+}
+
+// ************ CAreaDependencyTree ************
+CAreaDependencyTree::~CAreaDependencyTree()
+{
+    for (u32 iInst = 0; iInst < mScriptInstances.size(); iInst++)
+        delete mScriptInstances[iInst];
+}
+
+EDependencyNodeType CAreaDependencyTree::Type() const
+{
+    return eDNT_Area;
+}
+
+void CAreaDependencyTree::Read(IInputStream& rFile, EUIDLength IDLength)
+{
+    // Base dependency list contains non-script dependencies (world geometry textures + PATH/PTLA/EGMC)
+    CDependencyTree::Read(rFile, IDLength);
+    u32 NumScriptInstances = rFile.ReadLong();
+    mScriptInstances.reserve(NumScriptInstances);
+
+    for (u32 iInst = 0; iInst < NumScriptInstances; iInst++)
+    {
+        CScriptInstanceDependencyTree *pInst = new CScriptInstanceDependencyTree;
+        pInst->Read(rFile, IDLength);
+        mScriptInstances.push_back(pInst);
+    }
+
+    u32 NumLayers = rFile.ReadLong();
+    mLayerOffsets.reserve(NumLayers);
+
+    for (u32 iLyr = 0; iLyr < NumLayers; iLyr++)
+        mLayerOffsets.push_back( rFile.ReadLong() );
+}
+
+void CAreaDependencyTree::Write(IOutputStream& rFile, EUIDLength IDLength) const
+{
+    CDependencyTree::Write(rFile, IDLength);
+    rFile.WriteLong(mScriptInstances.size());
+
+    for (u32 iInst = 0; iInst < mScriptInstances.size(); iInst++)
+        mScriptInstances[iInst]->Write(rFile, IDLength);
+
+    rFile.WriteLong(mLayerOffsets.size());
+
+    for (u32 iLyr = 0; iLyr < mLayerOffsets.size(); iLyr++)
+        rFile.WriteLong(mLayerOffsets[iLyr]);
+}
+
+void CAreaDependencyTree::AddScriptLayer(CScriptLayer *pLayer)
+{
+    if (!pLayer) return;
+    mLayerOffsets.push_back(mScriptInstances.size());
+
+    for (u32 iInst = 0; iInst < pLayer->NumInstances(); iInst++)
+    {
+        CScriptInstanceDependencyTree *pTree = CScriptInstanceDependencyTree::BuildTree( pLayer->InstanceByIndex(iInst) );
+        ASSERT(pTree != nullptr);
+
+        if (pTree->NumDependencies() > 0)
+            mScriptInstances.push_back(pTree);
+        else
+            delete pTree;
+    }
+}
diff --git a/src/Core/GameProject/CDependencyTree.h b/src/Core/GameProject/CDependencyTree.h
new file mode 100644
index 00000000..23dbd264
--- /dev/null
+++ b/src/Core/GameProject/CDependencyTree.h
@@ -0,0 +1,156 @@
+#ifndef CDEPENDENCYTREE
+#define CDEPENDENCYTREE
+
+#include "CResourceEntry.h"
+#include <FileIO/FileIO.h>
+#include <Common/AssertMacro.h>
+#include <Common/CUniqueID.h>
+
+class CScriptLayer;
+class CScriptObject;
+class CPropertyStruct;
+class TCharacterProperty;
+
+// Group of node classes forming a tree of cached resource dependencies.
+enum EDependencyNodeType
+{
+    eDNT_Root,
+    eDNT_AnimSet,
+    eDNT_ScriptInstance,
+    eDNT_Area,
+    eDNT_ResourceDependency,
+    eDNT_AnimSetDependency
+};
+
+// Base class providing an interface for reading/writing to cache file and determining type.
+class IDependencyNode
+{
+public:
+    virtual ~IDependencyNode() {}
+    virtual EDependencyNodeType Type() const = 0;
+    virtual void Read(IInputStream& rFile, EUIDLength IDLength) = 0;
+    virtual void Write(IOutputStream& rFile, EUIDLength IDLength) const = 0;
+};
+
+// Node representing a single resource dependency.
+class CResourceDependency : public IDependencyNode
+{
+    CUniqueID mID;
+
+public:
+    CResourceDependency() {}
+    CResourceDependency(const CUniqueID& rkID) : mID(rkID) {}
+
+    virtual EDependencyNodeType Type() const;
+    virtual void Read(IInputStream& rFile, EUIDLength IDLength);
+    virtual void Write(IOutputStream& rFile, EUIDLength IDLength) const;
+
+    // Accessors
+    inline CUniqueID ID() const                 { return mID; }
+    inline void SetID(const CUniqueID& rkID)    { mID = rkID; }
+};
+
+// Node representing a single animset dependency contained in a script object. Indicates which character is being used.
+class CAnimSetDependency : public CResourceDependency
+{
+protected:
+    u32 mUsedChar;
+
+public:
+    CAnimSetDependency() : CResourceDependency(), mUsedChar(-1) {}
+
+    virtual EDependencyNodeType Type() const;
+    virtual void Read(IInputStream& rFile, EUIDLength IDLength);
+    virtual void Write(IOutputStream& rFile, EUIDLength IDLength) const;
+
+    // Accessors
+    inline u32 UsedChar() const                 { return mUsedChar; }
+    inline void SetUsedChar(u32 CharIdx)        { mUsedChar = CharIdx; }
+
+    // Static
+    static CAnimSetDependency* BuildDependency(TCharacterProperty *pProp);
+};
+
+// Tree root node, representing a resource.
+class CDependencyTree : public IDependencyNode
+{
+protected:
+    CUniqueID mID;
+    std::vector<CResourceDependency*> mReferencedResources;
+
+public:
+    CDependencyTree(const CUniqueID& rkID) : mID(rkID) {}
+    ~CDependencyTree();
+
+    virtual EDependencyNodeType Type() const;
+    virtual void Read(IInputStream& rFile, EUIDLength IDLength);
+    virtual void Write(IOutputStream& rFile, EUIDLength IDLength) const;
+
+    u32 NumDependencies() const;
+    bool HasDependency(const CUniqueID& rkID);
+    CUniqueID DependencyByIndex(u32 Index) const;
+    void AddDependency(const CUniqueID& rkID);
+    void AddDependency(CResource *pRes);
+
+    // Accessors
+    inline void SetID(const CUniqueID& rkID)    { mID = rkID; }
+    inline CUniqueID ID() const                 { return mID; }
+
+};
+
+// Node representing an animset resource; allows for lookup of dependencies of a particular character in the set.
+class CAnimSetDependencyTree : public CDependencyTree
+{
+protected:
+    std::vector<u32> mCharacterOffsets;
+
+public:
+    CAnimSetDependencyTree(const CUniqueID& rkID) : CDependencyTree(rkID) {}
+    virtual EDependencyNodeType Type() const;
+    virtual void Read(IInputStream& rFile, EUIDLength IDLength);
+    virtual void Write(IOutputStream& rFile, EUIDLength IDLength) const;
+};
+
+// Node representing a script object. Indicates the type of object.
+class CScriptInstanceDependencyTree : public IDependencyNode
+{
+protected:
+    u32 mObjectType;
+    std::vector<CResourceDependency*> mDependencies;
+
+public:
+    ~CScriptInstanceDependencyTree();
+
+    virtual EDependencyNodeType Type() const;
+    virtual void Read(IInputStream& rFile, EUIDLength IDLength);
+    virtual void Write(IOutputStream& rFile, EUIDLength IDLength) const;
+    bool HasDependency(const CUniqueID& rkID);
+
+    // Accessors
+    u32 NumDependencies() const { return mDependencies.size(); }
+
+    // Static
+    static CScriptInstanceDependencyTree* BuildTree(CScriptObject *pInstance);
+    static void ParseStructDependencies(CScriptInstanceDependencyTree *pTree, CPropertyStruct *pStruct);
+};
+
+// Node representing an area. Tracks dependencies on a per-instance basis and can separate dependencies of different script layers.
+class CAreaDependencyTree : public CDependencyTree
+{
+protected:
+    std::vector<CScriptInstanceDependencyTree*> mScriptInstances;
+    std::vector<u32> mLayerOffsets;
+
+public:
+    CAreaDependencyTree(const CUniqueID& rkID) : CDependencyTree(rkID) {}
+    ~CAreaDependencyTree();
+
+    virtual EDependencyNodeType Type() const;
+    virtual void Read(IInputStream& rFile, EUIDLength IDLength);
+    virtual void Write(IOutputStream& rFile, EUIDLength IDLength) const;
+
+    void AddScriptLayer(CScriptLayer *pLayer);
+};
+
+#endif // CDEPENDENCYTREE
+
diff --git a/src/Core/GameProject/CGameExporter.cpp b/src/Core/GameProject/CGameExporter.cpp
index 0e97ee49..73b3e6fb 100644
--- a/src/Core/GameProject/CGameExporter.cpp
+++ b/src/Core/GameProject/CGameExporter.cpp
@@ -1,4 +1,5 @@
 #include "CGameExporter.h"
+#include "Core/GameProject/CResourceIterator.h"
 #include "Core/GameProject/CResourceStore.h"
 #include "Core/Resource/CWorld.h"
 #include "Core/Resource/Script/CMasterTemplate.h"
@@ -14,6 +15,7 @@
 #define SAVE_PACKAGE_DEFINITIONS 1
 #define EXPORT_WORLDS 1
 #define EXPORT_COOKED 1
+#define EXPORT_CACHE 1
 
 CGameExporter::CGameExporter(const TString& rkInputDir, const TString& rkOutputDir)
     : mStore(this)
@@ -476,7 +478,6 @@ void CGameExporter::ExportWorlds()
 
 void CGameExporter::ExportCookedResources()
 {
-#if EXPORT_COOKED
     {
         SCOPED_TIMER(ExportCookedResources);
         FileUtil::CreateDirectory(mCookedDir);
@@ -487,7 +488,6 @@ void CGameExporter::ExportCookedResources()
             ExportResource(rRes);
         }
     }
-#endif
     {
         SCOPED_TIMER(SaveResourceDatabase);
 #if EXPORT_COOKED
@@ -495,6 +495,20 @@ void CGameExporter::ExportCookedResources()
 #endif
         mpProject->Save();
     }
+#if EXPORT_CACHE
+    {
+        SCOPED_TIMER(SaveCacheData);
+
+        for (CResourceIterator It(&mStore); It; ++It)
+        {
+            if (!It->IsTransient())
+            {
+                It->UpdateDependencies();
+                It->SaveCacheData();
+            }
+        }
+    }
+#endif
 }
 
 void CGameExporter::ExportResource(SResourceInstance& rRes)
@@ -520,6 +534,7 @@ void CGameExporter::ExportResource(SResourceInstance& rRes)
         // Register resource and write to file
         CResourceEntry *pEntry = mStore.RegisterResource(rRes.ResourceID, CResource::ResTypeForExtension(rRes.ResourceType), OutDir, OutName);
 
+#if EXPORT_COOKED
         // Cooked (todo: save raw)
         TWideString OutPath = pEntry->CookedAssetPath();
         FileUtil::CreateDirectory(OutPath.GetFileDirectory());
@@ -530,5 +545,8 @@ void CGameExporter::ExportResource(SResourceInstance& rRes)
 
         rRes.Exported = true;
         ASSERT(pEntry->HasCookedVersion());
+#else
+        (void) pEntry; // Prevent "unused local variable" compiler warning
+#endif
     }
 }
diff --git a/src/Core/GameProject/CGameProject.cpp b/src/Core/GameProject/CGameProject.cpp
index 0a49804a..a5306aae 100644
--- a/src/Core/GameProject/CGameProject.cpp
+++ b/src/Core/GameProject/CGameProject.cpp
@@ -68,6 +68,7 @@ bool CGameProject::Load(const TWideString& rkPath)
 
     // All loaded!
     mProjectRoot = rkPath.GetFileDirectory();
+    mProjectRoot.Replace(L"/", L"\\");
     return true;
 }
 
diff --git a/src/Core/GameProject/CGameProject.h b/src/Core/GameProject/CGameProject.h
index 712d47cf..862ff854 100644
--- a/src/Core/GameProject/CGameProject.h
+++ b/src/Core/GameProject/CGameProject.h
@@ -38,7 +38,9 @@ public:
         , mProjectName("Unnamed Project")
         , mProjectRoot(rkProjRootDir)
         , mResourceDBPath(L"ResourceDB.rdb")
-    {}
+    {
+        mProjectRoot.Replace(L"/", L"\\");
+    }
 
     ~CGameProject();
 
@@ -51,6 +53,7 @@ public:
     inline TWideString ProjectRoot() const                      { return mProjectRoot; }
     inline TWideString ResourceDBPath(bool Relative) const      { return Relative ? mResourceDBPath : mProjectRoot + mResourceDBPath; }
     inline TWideString DiscDir(bool Relative) const             { return Relative ? L"Disc\\" : mProjectRoot + L"Disc\\"; }
+    inline TWideString CacheDir(bool Relative) const            { return Relative ? L"Cache\\" : mProjectRoot + L"Cache\\"; }
     inline TWideString ContentDir(bool Relative) const          { return Relative ? L"Content\\" : mProjectRoot + L"Content\\"; }
     inline TWideString CookedDir(bool Relative) const           { return Relative ? L"Cooked\\" : mProjectRoot + L"Cooked\\"; }
     inline TWideString PackagesDir(bool Relative) const         { return Relative ? L"Packages\\" : mProjectRoot + L"Packages\\"; }
diff --git a/src/Core/GameProject/CResourceEntry.cpp b/src/Core/GameProject/CResourceEntry.cpp
index 83c9d973..f319f725 100644
--- a/src/Core/GameProject/CResourceEntry.cpp
+++ b/src/Core/GameProject/CResourceEntry.cpp
@@ -2,6 +2,7 @@
 #include "CGameProject.h"
 #include "CResourceStore.h"
 #include "Core/Resource/CResource.h"
+#include <FileIO/FileIO.h>
 #include <Common/FileUtil.h>
 #include <Common/TString.h>
 
@@ -11,6 +12,7 @@
 #include "Core/Resource/Factory/CAnimSetLoader.h"
 #include "Core/Resource/Factory/CAreaLoader.h"
 #include "Core/Resource/Factory/CCollisionLoader.h"
+#include "Core/Resource/Factory/CDependencyGroupLoader.h"
 #include "Core/Resource/Factory/CFontLoader.h"
 #include "Core/Resource/Factory/CMaterialLoader.h"
 #include "Core/Resource/Factory/CModelLoader.h"
@@ -26,19 +28,20 @@
 CResourceEntry::CResourceEntry(CResourceStore *pStore, const CUniqueID& rkID,
                const TWideString& rkDir, const TWideString& rkFilename,
                EResType Type, bool Transient /*= false*/)
-    : mpStore(pStore)
-    , mpResource(nullptr)
+    : mpResource(nullptr)
+    , mpStore(pStore)
+    , mpDependencies(nullptr)
     , mID(rkID)
     , mName(rkFilename)
     , mType(Type)
-    , mNeedsRecook(false)
-    , mTransient(Transient)
     , mCachedSize(-1)
     , mCachedUppercaseName(rkFilename.ToUpper())
 {
+    if (Transient) mFlags |= eREF_Transient;
+
     mpDirectory = mpStore->GetVirtualDirectory(rkDir, Transient, true);
     if (mpDirectory) mpDirectory->AddChild(L"", this);
-    mGame = ((mTransient || !mpStore->ActiveProject()) ? eUnknownVersion : mpStore->ActiveProject()->Game());
+    mGame = ((Transient || !mpStore->ActiveProject()) ? eUnknownVersion : mpStore->ActiveProject()->Game());
 }
 
 CResourceEntry::~CResourceEntry()
@@ -46,6 +49,104 @@ CResourceEntry::~CResourceEntry()
     if (mpResource) delete mpResource;
 }
 
+bool CResourceEntry::LoadCacheData()
+{
+    ASSERT(!IsTransient());
+
+    TWideString Path = CacheDataPath(false);
+    CFileInStream File(Path.ToUTF8().ToStdString(), IOUtil::eLittleEndian);
+
+    if (!File.IsValid())
+    {
+        Log::Error("Unable to load cache data " + Path.ToUTF8() + "; couldn't open file");
+        return false;
+    }
+
+    // Header
+    TString Magic = File.ReadString(4);
+    ASSERT(Magic == "CACH");
+    File.Seek(0x4, SEEK_CUR); // Skip Version
+    mFlags = File.ReadLong() & eREF_SavedFlags;
+
+    // Dependency Tree
+    u32 DepsTreeSize = File.ReadLong();
+
+    if (mpDependencies)
+    {
+        delete mpDependencies;
+        mpDependencies = nullptr;
+    }
+
+    if (DepsTreeSize > 0)
+    {
+        mpDependencies = new CDependencyTree(mID);
+        mpDependencies->Read(File, Game() <= eEchoes ? e32Bit : e64Bit);
+    }
+
+    return true;
+}
+
+bool CResourceEntry::SaveCacheData()
+{
+    ASSERT(!IsTransient());
+
+    TWideString Path = CacheDataPath(false);
+    TWideString Dir = Path.GetFileDirectory();
+    FileUtil::CreateDirectory(Dir);
+    CFileOutStream File(Path.ToUTF8().ToStdString(), IOUtil::eLittleEndian);
+
+    if (!File.IsValid())
+    {
+        Log::Error("Unable to save cache data " + TString(Path.GetFileName()) + "; couldn't open file");
+        return false;
+    }
+
+    // Header
+    File.WriteString("CACH", 4);
+    File.WriteLong(0); // Reserved Space (Version)
+    File.WriteLong(mFlags & eREF_SavedFlags);
+
+    // Dependency Tree
+    if (!mpDependencies) UpdateDependencies();
+
+    u32 DepsSizeOffset = File.Tell();
+    File.WriteLong(0);
+
+    u32 DepsStart = File.Tell();
+    if (mpDependencies) mpDependencies->Write(File, Game() <= eEchoes ? e32Bit : e64Bit);
+    u32 DepsSize = File.Tell() - DepsStart;
+    File.Seek(DepsSizeOffset, SEEK_SET);
+    File.WriteLong(DepsSize);
+
+    return true;
+}
+
+void CResourceEntry::UpdateDependencies()
+{
+    if (mpDependencies)
+    {
+        delete mpDependencies;
+        mpDependencies = nullptr;
+    }
+
+    if (!mpResource)
+        Load();
+
+    if (!mpResource)
+    {
+        Log::Error("Unable to update cached dependencies; failed to load resource");
+        return;
+    }
+
+    mpDependencies = mpResource->BuildDependencyTree();
+    gpResourceStore->DestroyUnreferencedResources();
+}
+
+TWideString CResourceEntry::CacheDataPath(bool Relative) const
+{
+    return mpStore->ActiveProject()->CacheDir(Relative) + mID.ToString().ToUTF16() + L".rcd";
+}
+
 bool CResourceEntry::HasRawVersion() const
 {
     return FileUtil::Exists(RawAssetPath());
@@ -61,7 +162,7 @@ TString CResourceEntry::RawAssetPath(bool Relative) const
     TWideString Ext = GetResourceRawExtension(mType, mGame).ToUTF16();
     TWideString Path = mpDirectory ? mpDirectory->FullPath() : L"";
     TWideString Name = mName + L"." + Ext;
-    return ((mTransient || Relative) ? Path + Name : mpStore->ActiveProject()->ContentDir(false) + Path + Name);
+    return ((IsTransient() || Relative) ? Path + Name : mpStore->ActiveProject()->ContentDir(false) + Path + Name);
 }
 
 TString CResourceEntry::CookedAssetPath(bool Relative) const
@@ -69,7 +170,7 @@ TString CResourceEntry::CookedAssetPath(bool Relative) const
     TWideString Ext = GetResourceCookedExtension(mType, mGame).ToUTF16();
     TWideString Path = mpDirectory ? mpDirectory->FullPath() : L"";
     TWideString Name = mName + L"." + Ext;
-    return ((mTransient || Relative) ? Path + Name : mpStore->ActiveProject()->CookedDir(false) + Path + Name);
+    return ((IsTransient() || Relative) ? Path + Name : mpStore->ActiveProject()->CookedDir(false) + Path + Name);
 }
 
 bool CResourceEntry::IsInDirectory(CVirtualDirectory *pDir) const
@@ -101,11 +202,11 @@ u64 CResourceEntry::Size() const
 bool CResourceEntry::NeedsRecook() const
 {
     // Assets that do not have a raw version can't be recooked since they will always just be saved cooked to begin with.
-    // We will recook any asset where the raw version has been updated but not recooked yet. mNeedsRecook can also be
+    // We will recook any asset where the raw version has been updated but not recooked yet. eREF_NeedsRecook can also be
     // toggled to arbitrarily flag any asset for recook.
     if (!HasRawVersion()) return false;
     if (!HasCookedVersion()) return true;
-    if (mNeedsRecook) return true;
+    if (mFlags.HasFlag(eREF_NeedsRecook)) return true;
     return (FileUtil::LastModifiedTime(CookedAssetPath()) < FileUtil::LastModifiedTime(RawAssetPath()));
 }
 
@@ -152,6 +253,7 @@ CResource* CResourceEntry::Load(IInputStream& rInput)
     case eAnimation:            mpResource = CAnimationLoader::LoadANIM(rInput, this);      break;
     case eAnimSet:              mpResource = CAnimSetLoader::LoadANCSOrCHAR(rInput, this);  break;
     case eArea:                 mpResource = CAreaLoader::LoadMREA(rInput, this);           break;
+    case eDependencyGroup:      mpResource = CDependencyGroupLoader::LoadDGRP(rInput, this);break;
     case eDynamicCollision:     mpResource = CCollisionLoader::LoadDCLN(rInput, this);      break;
     case eFont:                 mpResource = CFontLoader::LoadFONT(rInput, this);           break;
     case eModel:                mpResource = CModelLoader::LoadCMDL(rInput, this);          break;
@@ -185,7 +287,7 @@ void CResourceEntry::Move(const TWideString& rkDir, const TWideString& rkName)
 
     // Set new directory and name
     bool HasDirectory = mpDirectory != nullptr;
-    CVirtualDirectory *pNewDir = mpStore->GetVirtualDirectory(rkDir, mTransient, true);
+    CVirtualDirectory *pNewDir = mpStore->GetVirtualDirectory(rkDir, IsTransient(), true);
 
     if (pNewDir != mpDirectory)
     {
@@ -216,9 +318,9 @@ void CResourceEntry::Move(const TWideString& rkDir, const TWideString& rkName)
 
 void CResourceEntry::AddToProject(const TWideString& rkDir, const TWideString& rkName)
 {
-    if (mTransient)
+    if (mFlags.HasFlag(eREF_Transient))
     {
-        mTransient = false;
+        mFlags.ClearFlag(eREF_Transient);
         Move(rkDir, rkName);
     }
 
@@ -230,10 +332,10 @@ void CResourceEntry::AddToProject(const TWideString& rkDir, const TWideString& r
 
 void CResourceEntry::RemoveFromProject()
 {
-    if (!mTransient)
+    if (!mFlags.HasFlag(eREF_Transient))
     {
         TString Dir = CookedAssetPath().GetFileDirectory();
-        mTransient = true;
+        mFlags.SetFlag(eREF_Transient);
         Move(Dir, mName);
     }
 
diff --git a/src/Core/GameProject/CResourceEntry.h b/src/Core/GameProject/CResourceEntry.h
index cb67c78c..5dc2cceb 100644
--- a/src/Core/GameProject/CResourceEntry.h
+++ b/src/Core/GameProject/CResourceEntry.h
@@ -4,31 +4,49 @@
 #include "CVirtualDirectory.h"
 #include "Core/Resource/EResType.h"
 #include <Common/CUniqueID.h>
+#include <Common/Flags.h>
 #include <Common/types.h>
 
 class CResource;
 class CResourceStore;
+class CDependencyTree;
+
+enum EResEntryFlag
+{
+    eREF_NeedsRecook     = 0x1,
+    eREF_Transient       = 0x2,
+    eREF_HasThumbnail    = 0x4,
+    // Flags that save to the cache file
+    eREF_SavedFlags      = eREF_NeedsRecook | eREF_HasThumbnail
+};
+DECLARE_FLAGS(EResEntryFlag, FResEntryFlags)
 
 class CResourceEntry
 {
-    CResourceStore *mpStore;
     CResource *mpResource;
+    CResourceStore *mpStore;
+    CDependencyTree *mpDependencies;
     CUniqueID mID;
     EResType mType;
     EGame mGame;
     CVirtualDirectory *mpDirectory;
     TWideString mName;
-    bool mNeedsRecook;
-    bool mTransient;
+    FResEntryFlags mFlags;
 
     mutable u64 mCachedSize;
-    mutable TWideString mCachedUppercaseName; // This is used to speed up case-insensitive sorting.
+    mutable TWideString mCachedUppercaseName; // This is used to speed up case-insensitive sorting and filtering.
 
 public:
     CResourceEntry(CResourceStore *pStore, const CUniqueID& rkID,
                    const TWideString& rkDir, const TWideString& rkFilename,
                    EResType Type, bool Transient = false);
     ~CResourceEntry();
+
+    bool LoadCacheData();
+    bool SaveCacheData();
+    void UpdateDependencies();
+    TWideString CacheDataPath(bool Relative = false) const;
+
     bool HasRawVersion() const;
     bool HasCookedVersion() const;
     TString RawAssetPath(bool Relative = false) const;
@@ -45,17 +63,18 @@ public:
     void RemoveFromProject();
 
     // Accessors
-    void SetDirty()                             { mNeedsRecook = true; }
+    void SetDirty()                                     { mFlags.SetFlag(eREF_NeedsRecook); }
 
-    inline bool IsLoaded() const                { return mpResource != nullptr; }
-    inline CResource* Resource() const          { return mpResource; }
-    inline CUniqueID ID() const                 { return mID; }
-    inline EGame Game() const                   { return mGame; }
-    inline CVirtualDirectory* Directory() const { return mpDirectory; }
-    inline TWideString Name() const             { return mName; }
-    inline TWideString UppercaseName() const    { return mCachedUppercaseName; }
-    inline EResType ResourceType() const        { return mType; }
-    inline bool IsTransient() const             { return mTransient; }
+    inline bool IsLoaded() const                        { return mpResource != nullptr; }
+    inline CResource* Resource() const                  { return mpResource; }
+    inline CDependencyTree* Dependencies() const        { return mpDependencies; }
+    inline CUniqueID ID() const                         { return mID; }
+    inline EGame Game() const                           { return mGame; }
+    inline CVirtualDirectory* Directory() const         { return mpDirectory; }
+    inline TWideString Name() const                     { return mName; }
+    inline const TWideString& UppercaseName() const     { return mCachedUppercaseName; }
+    inline EResType ResourceType() const                { return mType; }
+    inline bool IsTransient() const                     { return mFlags.HasFlag(eREF_Transient); }
 
 protected:
     CResource* InternalLoad(IInputStream& rInput);
diff --git a/src/Core/GameProject/CResourceIterator.h b/src/Core/GameProject/CResourceIterator.h
index 171fd778..4ddb72f8 100644
--- a/src/Core/GameProject/CResourceIterator.h
+++ b/src/Core/GameProject/CResourceIterator.h
@@ -11,7 +11,7 @@ class CResourceIterator
     CResourceEntry *mpCurEntry;
 
 public:
-    CResourceIterator(CResourceStore *pStore)
+    CResourceIterator(CResourceStore *pStore = gpResourceStore)
         : mpStore(pStore)
         , mpCurEntry(nullptr)
     {
diff --git a/src/Core/GameProject/CResourceStore.cpp b/src/Core/GameProject/CResourceStore.cpp
index bc635ab4..b3dcdc7f 100644
--- a/src/Core/GameProject/CResourceStore.cpp
+++ b/src/Core/GameProject/CResourceStore.cpp
@@ -69,6 +69,14 @@ void CResourceStore::LoadResourceDatabase(const TString& rkPath)
             pRes = pRes->NextSiblingElement("Resource");
         }
     }
+
+    // All resources registered - load cache data
+    for (auto It = mResourceEntries.begin(); It != mResourceEntries.end(); It++)
+    {
+        CResourceEntry *pEntry = It->second;
+        if (!pEntry->IsTransient())
+            pEntry->LoadCacheData();
+    }
 }
 
 void CResourceStore::SaveResourceDatabase(const TString& rkPath) const
@@ -108,10 +116,6 @@ void CResourceStore::SaveResourceDatabase(const TString& rkPath) const
         XMLElement *pName = Doc.NewElement("FileName");
         pName->SetText(*pEntry->Name().ToUTF8());
         pRes->LinkEndChild(pName);
-
-        XMLElement *pRecook = Doc.NewElement("NeedsRecook");
-        pRecook->SetText(pEntry->NeedsRecook() ? "true" : "false");
-        pRes->LinkEndChild(pRecook);
     }
 
     Doc.SaveFile(*rkPath);
@@ -231,10 +235,7 @@ CResourceEntry* CResourceStore::RegisterTransientResource(EResType Type, const C
 {
     CResourceEntry *pEntry = FindEntry(rkID);
 
-    if (pEntry)
-        Log::Error("Attempted to register transient resource that already exists: " + rkID.ToString() + " / Dir: " + rkDir.ToUTF8() + " / Name: " + rkFileName.ToUTF8());
-
-    else
+    if (!pEntry)
     {
         pEntry = new CResourceEntry(this, rkID, rkDir, rkFileName, Type, true);
         mResourceEntries[rkID] = pEntry;
diff --git a/src/Core/GameProject/CResourceStore.h b/src/Core/GameProject/CResourceStore.h
index 965cf56c..87c3be26 100644
--- a/src/Core/GameProject/CResourceStore.h
+++ b/src/Core/GameProject/CResourceStore.h
@@ -65,6 +65,8 @@ public:
     // Accessors
     inline CGameProject* ActiveProject() const      { return mpProj; }
     inline CVirtualDirectory* RootDirectory() const { return mpProjectRoot; }
+    inline u32 NumTotalResources() const            { return mResourceEntries.size(); }
+    inline u32 NumLoadedResources() const           { return mLoadedResources.size(); }
 };
 
 extern CResourceStore *gpResourceStore;
diff --git a/src/Core/Resource/Area/CGameArea.cpp b/src/Core/Resource/Area/CGameArea.cpp
index 37e89d38..66a54bb3 100644
--- a/src/Core/Resource/Area/CGameArea.cpp
+++ b/src/Core/Resource/Area/CGameArea.cpp
@@ -10,7 +10,7 @@ CGameArea::CGameArea(CResourceEntry *pEntry /*= 0*/)
     , mTerrainMerged(false)
     , mOriginalWorldMeshCount(0)
     , mUsesCompression(false)
-    , mMaterialSet(nullptr)
+    , mpMaterialSet(nullptr)
     , mpGeneratorLayer(nullptr)
     , mpCollision(nullptr)
 {
@@ -31,6 +31,32 @@ CGameArea::~CGameArea()
             delete mLightLayers[iLyr][iLight];
 }
 
+CDependencyTree* CGameArea::BuildDependencyTree() const
+{
+    // Base dependencies
+    CAreaDependencyTree *pTree = new CAreaDependencyTree(ResID());
+
+    for (u32 iMat = 0; iMat < mpMaterialSet->NumMaterials(); iMat++)
+    {
+        CMaterial *pMat = mpMaterialSet->MaterialByIndex(iMat);
+        pTree->AddDependency(pMat->IndTexture());
+
+        for (u32 iPass = 0; iPass < pMat->PassCount(); iPass++)
+            pTree->AddDependency(pMat->Pass(iPass)->Texture());
+    }
+
+    pTree->AddDependency(mpPoiToWorldMap);
+    Log::Warning("CGameArea::FindDependencies not handling PATH/PTLA");
+    
+    // Layer dependencies
+    for (u32 iLayer = 0; iLayer < mScriptLayers.size(); iLayer++)
+        pTree->AddScriptLayer(mScriptLayers[iLayer]);
+
+    pTree->AddScriptLayer(mpGeneratorLayer);
+
+    return pTree;
+}
+
 void CGameArea::AddWorldModel(CModel *pModel)
 {
     mWorldModels.push_back(pModel);
@@ -52,7 +78,7 @@ void CGameArea::MergeTerrain()
         for (u32 iSurf = 0; iSurf < SubmeshCount; iSurf++)
         {
             SSurface *pSurf = pMdl->GetSurface(iSurf);
-            CMaterial *pMat = mMaterialSet->MaterialByIndex(pSurf->MaterialID);
+            CMaterial *pMat = mpMaterialSet->MaterialByIndex(pSurf->MaterialID);
 
             bool NewMat = true;
             for (std::vector<CStaticModel*>::iterator it = mStaticWorldModels.begin(); it != mStaticWorldModels.end(); it++)
@@ -93,7 +119,7 @@ void CGameArea::ClearTerrain()
         delete mStaticWorldModels[iStatic];
     mStaticWorldModels.clear();
 
-    if (mMaterialSet) delete mMaterialSet;
+    if (mpMaterialSet) delete mpMaterialSet;
 
     mVertexCount = 0;
     mTriangleCount = 0;
diff --git a/src/Core/Resource/Area/CGameArea.h b/src/Core/Resource/Area/CGameArea.h
index ddb31453..7db83507 100644
--- a/src/Core/Resource/Area/CGameArea.h
+++ b/src/Core/Resource/Area/CGameArea.h
@@ -45,7 +45,7 @@ class CGameArea : public CResource
     std::vector<SSectionNumber> mSectionNumbers;
 
     // Geometry
-    CMaterialSet *mMaterialSet;
+    CMaterialSet *mpMaterialSet;
     std::vector<CModel*> mWorldModels; // TerrainModels is the original version of each model; this is currently mainly used in the POI map editor
     std::vector<CStaticModel*> mStaticWorldModels; // StaticTerrainModels is the merged terrain for faster rendering in the world editor
     // Script
@@ -62,6 +62,7 @@ class CGameArea : public CResource
 public:
     CGameArea(CResourceEntry *pEntry = 0);
     ~CGameArea();
+    CDependencyTree* BuildDependencyTree() const;
 
     void AddWorldModel(CModel *pModel);
     void MergeTerrain();
diff --git a/src/Core/Resource/CAnimationParameters.h b/src/Core/Resource/CAnimationParameters.h
index 202290ce..daa88aaa 100644
--- a/src/Core/Resource/CAnimationParameters.h
+++ b/src/Core/Resource/CAnimationParameters.h
@@ -28,6 +28,7 @@ public:
 
     // Accessors
     inline EGame Version() const        { return mGame; }
+    inline CUniqueID ID() const         { return mCharacter.ID(); }
     inline CAnimSet* AnimSet() const    { return (CAnimSet*) mCharacter.Load(); }
     inline u32 CharacterIndex() const   { return mCharIndex; }
     inline u32 AnimIndex() const        { return mAnimIndex; }
diff --git a/src/Core/Resource/CDependencyGroup.h b/src/Core/Resource/CDependencyGroup.h
new file mode 100644
index 00000000..5a646dbf
--- /dev/null
+++ b/src/Core/Resource/CDependencyGroup.h
@@ -0,0 +1,33 @@
+#ifndef CDEPENDENCYGROUP
+#define CDEPENDENCYGROUP
+
+#include "CResource.h"
+
+class CDependencyGroup : public CResource
+{
+    DECLARE_RESOURCE_TYPE(eDependencyGroup)
+    std::set<CUniqueID> mDependencies;
+
+public:
+    CDependencyGroup(CResourceEntry *pEntry = 0) : CResource(pEntry) {}
+    inline void AddDependency(const CUniqueID& rkID)        { mDependencies.insert(rkID); }
+    inline void AddDependency(CResource *pRes)              { if (pRes) mDependencies.insert(pRes->ResID()); }
+    inline void RemoveDependency(const CUniqueID& rkID)     { mDependencies.erase(rkID); }
+    inline void Clear()                                     { mDependencies.clear(); }
+    inline bool HasDependency(const CUniqueID& rkID) const  { return mDependencies.find(rkID) != mDependencies.end(); }
+    inline u32 NumDependencies() const                      { return mDependencies.size(); }
+    inline CUniqueID DependencyByIndex(u32 Index) const     { return *std::next(mDependencies.begin(), Index); }
+    
+    CDependencyTree* BuildDependencyTree() const
+    {
+        CDependencyTree *pTree = new CDependencyTree(ResID());
+
+        for (auto DepIt = mDependencies.begin(); DepIt != mDependencies.end(); DepIt++)
+            pTree->AddDependency(*DepIt);
+
+        return pTree;
+    }
+};
+
+#endif // CDEPENDENCYGROUP
+
diff --git a/src/Core/Resource/CFont.cpp b/src/Core/Resource/CFont.cpp
index 6add9989..7372fe92 100644
--- a/src/Core/Resource/CFont.cpp
+++ b/src/Core/Resource/CFont.cpp
@@ -22,6 +22,13 @@ inline float PtsToFloat(s32 Pt)
     return 0.00208333f * Pt;
 }
 
+CDependencyTree* CFont::BuildDependencyTree() const
+{
+    CDependencyTree *pOut = new CDependencyTree(ResID());
+    pOut->AddDependency(mpFontTexture);
+    return pOut;
+}
+
 CVector2f CFont::RenderString(const TString& rkString, CRenderer* /*pRenderer*/, float /*AspectRatio*/,
                               CVector2f /*Position*/, CColor FillColor, CColor StrokeColor, u32 FontSize)
 {
diff --git a/src/Core/Resource/CFont.h b/src/Core/Resource/CFont.h
index 487b7605..d9060b5d 100644
--- a/src/Core/Resource/CFont.h
+++ b/src/Core/Resource/CFont.h
@@ -60,6 +60,7 @@ class CFont : public CResource
 public:
     CFont(CResourceEntry *pEntry = 0);
     ~CFont();
+    CDependencyTree* BuildDependencyTree() const;
     CVector2f RenderString(const TString& rkString, CRenderer *pRenderer, float AspectRatio,
                            CVector2f Position = CVector2f(0,0),
                            CColor FillColor = CColor::skWhite, CColor StrokeColor = CColor::skBlack,
diff --git a/src/Core/Resource/CResource.h b/src/Core/Resource/CResource.h
index f5ac180d..78e7a254 100644
--- a/src/Core/Resource/CResource.h
+++ b/src/Core/Resource/CResource.h
@@ -2,6 +2,7 @@
 #define CRESOURCE_H
 
 #include "EResType.h"
+#include "Core/GameProject/CDependencyTree.h"
 #include "Core/GameProject/CResourceEntry.h"
 #include "Core/GameProject/CResourceStore.h"
 #include <Common/CFourCC.h>
@@ -39,7 +40,8 @@ public:
     }
 
     virtual ~CResource() {}
-
+    virtual CDependencyTree* BuildDependencyTree() const { return new CDependencyTree(ResID()); }
+    
     inline CResourceEntry* Entry() const    { return mpEntry; }
     inline TString Source() const           { return mpEntry ? mpEntry->CookedAssetPath(true).GetFileName() : ""; }
     inline TString FullSource() const       { return mpEntry ? mpEntry->CookedAssetPath(true) : ""; }
diff --git a/src/Core/Resource/CScan.h b/src/Core/Resource/CScan.h
index 3c070910..391b9ab3 100644
--- a/src/Core/Resource/CScan.h
+++ b/src/Core/Resource/CScan.h
@@ -40,6 +40,17 @@ public:
         , mCategory(eNone)
     {}
 
+    CDependencyTree* BuildDependencyTree() const
+    {
+        if (Game() >= eEchoesDemo)
+            Log::Warning("CScan::BuildDependencyTree not handling Echoes/Corruption dependencies");
+
+        CDependencyTree *pTree = new CDependencyTree(ResID());
+        pTree->AddDependency(mpFrame);
+        pTree->AddDependency(mpStringTable);
+        return pTree;
+    }
+
     EGame Version() const                       { return mVersion; }
     CStringTable* ScanText() const              { return mpStringTable; }
     bool IsImportant() const                    { return mIsImportant; }
diff --git a/src/Core/Resource/CWorld.cpp b/src/Core/Resource/CWorld.cpp
index a2e64efe..66a32aa5 100644
--- a/src/Core/Resource/CWorld.cpp
+++ b/src/Core/Resource/CWorld.cpp
@@ -17,6 +17,28 @@ CWorld::~CWorld()
 {
 }
 
+CDependencyTree* CWorld::BuildDependencyTree() const
+{
+    CDependencyTree *pTree = new CDependencyTree(ResID());
+
+    for (u32 iArea = 0; iArea < mAreas.size(); iArea++)
+    {
+        pTree->AddDependency(mAreas[iArea].FileID);
+        pTree->AddDependency(mAreas[iArea].pAreaName);
+    }
+    
+    pTree->AddDependency(mpWorldName);
+    pTree->AddDependency(mpDarkWorldName);
+    pTree->AddDependency(mpSaveWorld);
+    pTree->AddDependency(mpDefaultSkybox);
+    pTree->AddDependency(mpMapWorld);
+
+    if (Game() <= ePrime)
+        Log::Warning("CWorld::BuildDependencyTree not handling audio groups");
+
+    return pTree;
+}
+
 void CWorld::SetAreaLayerInfo(CGameArea *pArea)
 {
     // The AreaIndex parameter is a placeholder until an improved world loader is implemented.
diff --git a/src/Core/Resource/CWorld.h b/src/Core/Resource/CWorld.h
index 4590e032..57dcfb09 100644
--- a/src/Core/Resource/CWorld.h
+++ b/src/Core/Resource/CWorld.h
@@ -84,6 +84,7 @@ public:
     CWorld(CResourceEntry *pEntry = 0);
     ~CWorld();
 
+    CDependencyTree* BuildDependencyTree() const;
     void SetAreaLayerInfo(CGameArea *pArea);
 
     // Accessors
diff --git a/src/Core/Resource/Factory/CAreaLoader.cpp b/src/Core/Resource/Factory/CAreaLoader.cpp
index baed7098..e9e8fe61 100644
--- a/src/Core/Resource/Factory/CAreaLoader.cpp
+++ b/src/Core/Resource/Factory/CAreaLoader.cpp
@@ -73,7 +73,7 @@ void CAreaLoader::ReadGeometryPrime()
     mpSectionMgr->ToSection(mGeometryBlockNum);
 
     // Materials
-    mpArea->mMaterialSet = CMaterialLoader::LoadMaterialSet(*mpMREA, mVersion);
+    mpArea->mpMaterialSet = CMaterialLoader::LoadMaterialSet(*mpMREA, mVersion);
     mpSectionMgr->ToNextSection();
 
     // Geometry
@@ -81,7 +81,7 @@ void CAreaLoader::ReadGeometryPrime()
 
     for (u32 iMesh = 0; iMesh < mNumMeshes; iMesh++)
     {
-        CModel *pModel = CModelLoader::LoadWorldModel(*mpMREA, *mpSectionMgr, *mpArea->mMaterialSet, mVersion);
+        CModel *pModel = CModelLoader::LoadWorldModel(*mpMREA, *mpSectionMgr, *mpArea->mpMaterialSet, mVersion);
         FileModels.push_back(pModel);
 
         if (mVersion <= ePrime)
@@ -394,7 +394,7 @@ void CAreaLoader::ReadGeometryCorruption()
     mpSectionMgr->ToSection(mGeometryBlockNum);
 
     // Materials
-    mpArea->mMaterialSet = CMaterialLoader::LoadMaterialSet(*mpMREA, mVersion);
+    mpArea->mpMaterialSet = CMaterialLoader::LoadMaterialSet(*mpMREA, mVersion);
     mpSectionMgr->ToNextSection();
 
     // Geometry
@@ -404,7 +404,7 @@ void CAreaLoader::ReadGeometryCorruption()
 
     for (u32 iMesh = 0; iMesh < mNumMeshes; iMesh++)
     {
-        CModel *pWorldModel = CModelLoader::LoadCorruptionWorldModel(*mpMREA, *mpSectionMgr, *mpArea->mMaterialSet, CurWOBJSection, CurGPUSection, mVersion);
+        CModel *pWorldModel = CModelLoader::LoadCorruptionWorldModel(*mpMREA, *mpSectionMgr, *mpArea->mpMaterialSet, CurWOBJSection, CurGPUSection, mVersion);
         FileModels.push_back(pWorldModel);
 
         CurWOBJSection += 4;
diff --git a/src/Core/Resource/Factory/CDependencyGroupLoader.cpp b/src/Core/Resource/Factory/CDependencyGroupLoader.cpp
new file mode 100644
index 00000000..c94afa4e
--- /dev/null
+++ b/src/Core/Resource/Factory/CDependencyGroupLoader.cpp
@@ -0,0 +1,48 @@
+#include "CDependencyGroupLoader.h"
+#include <Common/AssertMacro.h>
+
+EGame CDependencyGroupLoader::VersionTest(IInputStream& rDGRP, u32 DepCount)
+{
+    // Only difference between versions is asset ID length. Just check for EOF with 32-bit ID length.
+    u32 Start = rDGRP.Tell();
+    rDGRP.Seek(DepCount * 4, SEEK_CUR);
+    u32 Remaining = rDGRP.Size() - Start;
+
+    EGame Game = ePrimeDemo;
+
+    if (Remaining < 32)
+    {
+        for (u32 iRem = 0; iRem < Remaining; iRem++)
+        {
+            if (rDGRP.ReadByte() != 0xFF)
+            {
+                Game = eCorruptionProto;
+                break;
+            }
+        }
+    }
+
+    rDGRP.Seek(Start, SEEK_SET);
+    return Game;
+}
+
+CDependencyGroup* CDependencyGroupLoader::LoadDGRP(IInputStream& rDGRP, CResourceEntry *pEntry)
+{
+    if (!rDGRP.IsValid()) return nullptr;
+
+    u32 NumDependencies = rDGRP.ReadLong();
+    EGame Game = VersionTest(rDGRP, NumDependencies);
+    EUIDLength IDLength = (Game < eCorruptionProto ? e32Bit : e64Bit);
+
+    CDependencyGroup *pGroup = new CDependencyGroup(pEntry);
+    pGroup->SetGame(Game);
+
+    for (u32 iDep = 0; iDep < NumDependencies; iDep++)
+    {
+        rDGRP.Seek(0x4, SEEK_CUR); // Skip dependency type
+        CUniqueID AssetID(rDGRP, IDLength);
+        pGroup->AddDependency(AssetID);
+    }
+
+    return pGroup;
+}
diff --git a/src/Core/Resource/Factory/CDependencyGroupLoader.h b/src/Core/Resource/Factory/CDependencyGroupLoader.h
new file mode 100644
index 00000000..f806b55c
--- /dev/null
+++ b/src/Core/Resource/Factory/CDependencyGroupLoader.h
@@ -0,0 +1,16 @@
+#ifndef CDEPENDENCYGROUPLOADER_H
+#define CDEPENDENCYGROUPLOADER_H
+
+#include "Core/Resource/CDependencyGroup.h"
+#include "Core/Resource/EGame.h"
+
+class CDependencyGroupLoader
+{
+    CDependencyGroupLoader() {}
+    static EGame VersionTest(IInputStream& rDGRP, u32 DepCount);
+
+public:
+    static CDependencyGroup* LoadDGRP(IInputStream& rDGRP, CResourceEntry *pEntry);
+};
+
+#endif // CDEPENDENCYGROUPLOADER_H
diff --git a/src/Core/Resource/Factory/CMaterialLoader.cpp b/src/Core/Resource/Factory/CMaterialLoader.cpp
index f54e4148..eb940a53 100644
--- a/src/Core/Resource/Factory/CMaterialLoader.cpp
+++ b/src/Core/Resource/Factory/CMaterialLoader.cpp
@@ -65,7 +65,7 @@ void CMaterialLoader::ReadPrimeMatSet()
     {
         mpSet->mMaterials[iMat] = ReadPrimeMaterial();
         mpSet->mMaterials[iMat]->mVersion = mVersion;
-        mpSet->mMaterials[iMat]->mName = TString("Material #") + std::to_string(iMat + 1);
+        mpSet->mMaterials[iMat]->mName = TString("Material #") + TString::FromInt32(iMat + 1, 0, 10);
         mpFile->Seek(MatsStart + Offsets[iMat], SEEK_SET);
     }
 }
@@ -261,7 +261,7 @@ void CMaterialLoader::ReadCorruptionMatSet()
         u32 Next = mpFile->Tell() + Size;
         mpSet->mMaterials[iMat] = ReadCorruptionMaterial();
         mpSet->mMaterials[iMat]->mVersion = mVersion;
-        mpSet->mMaterials[iMat]->mName = TString("Material #") + std::to_string(iMat + 1);
+        mpSet->mMaterials[iMat]->mName = TString("Material #") + TString::FromInt32(iMat + 1, 0, 10);
         mpFile->Seek(Next, SEEK_SET);
     }
 }
diff --git a/src/Core/Resource/Model/CModel.cpp b/src/Core/Resource/Model/CModel.cpp
index 11a0d54e..a8d29533 100644
--- a/src/Core/Resource/Model/CModel.cpp
+++ b/src/Core/Resource/Model/CModel.cpp
@@ -29,6 +29,31 @@ CModel::~CModel()
             delete mMaterialSets[iMat];
 }
 
+
+CDependencyTree* CModel::BuildDependencyTree() const
+{
+    CDependencyTree *pTree = new CDependencyTree(ResID());
+
+    for (u32 iSet = 0; iSet < mMaterialSets.size(); iSet++)
+    {
+        CMaterialSet *pSet = mMaterialSets[iSet];
+        
+        for (u32 iMat = 0; iMat < pSet->NumMaterials(); iMat++)
+        {
+            CMaterial *pMat = pSet->MaterialByIndex(iMat);
+            pTree->AddDependency(pMat->IndTexture());
+
+            for (u32 iPass = 0; iPass < pMat->PassCount(); iPass++)
+            {
+                CMaterialPass *pPass = pMat->Pass(iPass);
+                pTree->AddDependency(pPass->Texture());
+            }
+        }
+    }
+
+    return pTree;
+}
+
 void CModel::BufferGL()
 {
     if (!mBuffered)
diff --git a/src/Core/Resource/Model/CModel.h b/src/Core/Resource/Model/CModel.h
index fe171284..fae4a933 100644
--- a/src/Core/Resource/Model/CModel.h
+++ b/src/Core/Resource/Model/CModel.h
@@ -25,6 +25,7 @@ public:
     CModel(CMaterialSet *pSet, bool OwnsMatSet);
     ~CModel();
 
+    CDependencyTree* BuildDependencyTree() const;
     void BufferGL();
     void GenerateMaterialShaders();
     void ClearGLBuffer();
diff --git a/src/Core/Resource/Script/CScriptObject.cpp b/src/Core/Resource/Script/CScriptObject.cpp
index eeb86899..02f3bf9b 100644
--- a/src/Core/Resource/Script/CScriptObject.cpp
+++ b/src/Core/Resource/Script/CScriptObject.cpp
@@ -63,6 +63,7 @@ bool CScriptObject::IsEditorProperty(IProperty *pProp)
              (pProp == mpRotation) ||
              (pProp == mpScale) ||
              (pProp == mpActive) ||
+             (pProp == mpLightParameters) ||
              (pProp->Parent() == mpLightParameters)
            );
 }