diff --git a/BMap/BMExports.cpp b/BMap/BMExports.cpp
index c0e181b..73b9c32 100644
--- a/BMap/BMExports.cpp
+++ b/BMap/BMExports.cpp
@@ -2,13 +2,17 @@
 #include <IronPad.hpp>
 #include <set>
 
+static bool g_IsInited = false;
 static std::set<BMap::BMFile*> g_AllBMFiles = std::set<BMap::BMFile*>();
+static std::set<BMap::BMMeshTransition*> g_AllBMMeshTrans = std::set<BMap::BMMeshTransition*>();
 
 void BMInit() {
 	// register IronPad
 	IronPad::IronPadRegister();
 	// and startup CK environment
 	LibCmo::CK2::CKStartUp();
+	// set init
+	g_IsInited = true;
 }
 
 void BMDispose() {
@@ -17,13 +21,24 @@ void BMDispose() {
 		delete ptr;
 	}
 	g_AllBMFiles.clear();
+	// free all mesh transition
+	for (auto ptr : g_AllBMMeshTrans) {
+		delete ptr;
+	}
+	g_AllBMMeshTrans.clear();
+
+	// disable init
+	g_IsInited = false;
 	// shutdown CK environment
 	LibCmo::CK2::CKShutdown();
 	// unregister iron pad
 	IronPad::IronPadUnregister();
 }
 
+#pragma region BMFile
+
 BMap::BMFile* BMFile_Load(LibCmo::CKSTRING file_name, LibCmo::CKSTRING temp_folder, LibCmo::CKSTRING texture_folder, LibCmo::CKDWORD encoding_count, LibCmo::CKSTRING encodings[]) {
+	if (!g_IsInited) return nullptr;
 	auto file = new BMap::BMFile(temp_folder, texture_folder, encoding_count, encodings, false);
 	if (file->IsFailed()) {
 		delete file;
@@ -39,6 +54,7 @@ BMap::BMFile* BMFile_Load(LibCmo::CKSTRING file_name, LibCmo::CKSTRING temp_fold
 }
 
 BMap::BMFile* BMFile_Create(LibCmo::CKSTRING temp_folder, LibCmo::CKSTRING texture_folder, LibCmo::CKDWORD encoding_count, LibCmo::CKSTRING encodings[]) {
+	if (!g_IsInited) return nullptr;
 	auto file = new BMap::BMFile(temp_folder, texture_folder, encoding_count, encodings, false);
 	if (file->IsFailed()) {
 		delete file;
@@ -61,3 +77,104 @@ void BMFile_Free(BMap::BMFile* map_file) {
 		delete map_file;
 	}
 }
+
+#define VISITOR_IMPL(namepart, cidpart) \
+LibCmo::CKDWORD BMFile_Get ## namepart ## Count(BMap::BMFile* map_file) { \
+	if (!g_AllBMFiles.contains(map_file)) return 0; \
+	return map_file->Get ## namepart ## Count(); \
+} \
+LibCmo::CK2::ObjImpls::CK ## namepart * BMFile_Get ## namepart (BMap::BMFile* map_file, LibCmo::CKDWORD idx) { \
+	if (!g_AllBMFiles.contains(map_file)) return nullptr; \
+	return map_file->Get ## namepart (idx); \
+} \
+LibCmo::CK2::ObjImpls::CK ## namepart * BMFile_Create ## namepart (BMap::BMFile* map_file, LibCmo::CKSTRING name) { \
+	if (!g_AllBMFiles.contains(map_file)) return nullptr; \
+	return map_file->Create ## namepart (name); \
+}
+
+VISITOR_IMPL(Group, GROUP)
+VISITOR_IMPL(3dObject, 3DOBJECT)
+VISITOR_IMPL(Mesh, MESH)
+VISITOR_IMPL(Material, MATERIAL)
+VISITOR_IMPL(Texture, TEXTURE)
+
+#undef VISITOR_IMPL
+
+#pragma endregion
+
+#pragma region BMMeshTransition
+
+BMap::BMMeshTransition* BMMeshTrans_New() {
+	if (!g_IsInited) return nullptr;
+	auto meshtrans = new BMap::BMMeshTransition();
+	g_AllBMMeshTrans.emplace(meshtrans);
+	return meshtrans;
+}
+
+void BMMeshTrans_Delete(BMap::BMMeshTransition* trans) {
+	// only free correct pointer
+	if (trans == nullptr) return;
+	if (g_AllBMMeshTrans.erase(trans) != 0) {
+		delete trans;
+	}
+}
+
+void BMMeshTrans_PrepareVertexCount(BMap::BMMeshTransition* trans, LibCmo::CKDWORD count) {
+	if (!g_AllBMMeshTrans.contains(trans)) return;
+	trans->PrepareVertexCount(count);
+}
+LibCmo::VxMath::VxVector3* BMMeshTrans_PrepareVertex(BMap::BMMeshTransition* trans) {
+	if (!g_AllBMMeshTrans.contains(trans)) return nullptr;
+	return trans->PrepareVertex();
+}
+void BMMeshTrans_PrepareNormalCount(BMap::BMMeshTransition* trans, LibCmo::CKDWORD count) {
+	if (!g_AllBMMeshTrans.contains(trans)) return;
+	trans->PrepareNormalCount(count);
+}
+LibCmo::VxMath::VxVector3* BMMeshTrans_PrepareNormal(BMap::BMMeshTransition* trans) {
+	if (!g_AllBMMeshTrans.contains(trans)) return nullptr;
+	return trans->PrepareNormal();
+}
+void BMMeshTrans_PrepareUVCount(BMap::BMMeshTransition* trans, LibCmo::CKDWORD count) {
+	if (!g_AllBMMeshTrans.contains(trans)) return;
+	trans->PrepareUVCount(count);
+}
+LibCmo::VxMath::VxVector2* BMMeshTrans_PrepareUV(BMap::BMMeshTransition* trans) {
+	if (!g_AllBMMeshTrans.contains(trans)) return nullptr;
+	return trans->PrepareUV();
+}
+void BMMeshTrans_PrepareMtlSlotCount(BMap::BMMeshTransition* trans, LibCmo::CKDWORD count) {
+	if (!g_AllBMMeshTrans.contains(trans)) return;
+	trans->PrepareMtlSlotCount(count);
+}
+LibCmo::CK2::ObjImpls::CKMaterial** BMMeshTrans_PrepareMtlSlot(BMap::BMMeshTransition* trans) {
+	if (!g_AllBMMeshTrans.contains(trans)) return nullptr;
+	return trans->PrepareMtlSlot();
+}
+void BMMeshTrans_PrepareFaceCount(BMap::BMMeshTransition* trans, LibCmo::CKDWORD count) {
+	if (!g_AllBMMeshTrans.contains(trans)) return;
+	trans->PrepareFaceCount(count);
+}
+LibCmo::CKDWORD* BMMeshTrans_PrepareFaceVertexIndices(BMap::BMMeshTransition* trans) {
+	if (!g_AllBMMeshTrans.contains(trans)) return nullptr;
+	return trans->PrepareFaceVertexIndices();
+}
+LibCmo::CKDWORD* BMMeshTrans_PrepareFaceNormalIndices(BMap::BMMeshTransition* trans) {
+	if (!g_AllBMMeshTrans.contains(trans)) return nullptr;
+	return trans->PrepareFaceNormalIndices();
+}
+LibCmo::CKDWORD* BMMeshTrans_PrepareFaceUVIndices(BMap::BMMeshTransition* trans) {
+	if (!g_AllBMMeshTrans.contains(trans)) return nullptr;
+	return trans->PrepareFaceUVIndices();
+}
+LibCmo::CKDWORD* BMMeshTrans_PrepareFaceMtlSlot(BMap::BMMeshTransition* trans) {
+	if (!g_AllBMMeshTrans.contains(trans)) return nullptr;
+	return trans->PrepareFaceMtlSlot();
+}
+bool BMMeshTrans_Parse(BMap::BMMeshTransition* trans, LibCmo::CK2::ObjImpls::CKMesh* write_into_mesh) {
+	if (!g_AllBMMeshTrans.contains(trans)) return false;
+	return trans->Parse(write_into_mesh);
+}
+
+#pragma endregion
+
diff --git a/BMap/BMExports.hpp b/BMap/BMExports.hpp
index 3593795..1accfbd 100644
--- a/BMap/BMExports.hpp
+++ b/BMap/BMExports.hpp
@@ -16,10 +16,40 @@ LIBCMO_EXPORT BMap::BMFile* BMFile_Create(LibCmo::CKSTRING temp_folder, LibCmo::
 LIBCMO_EXPORT bool BMFile_Save(BMap::BMFile* map_file, LibCmo::CKSTRING file_name, LibCmo::CKINT compreess_level);
 LIBCMO_EXPORT void BMFile_Free(BMap::BMFile* map_file);
 
+#define VISITOR_DECL(namepart) \
+LIBCMO_EXPORT LibCmo::CKDWORD BMFile_Get ## namepart ## Count(BMap::BMFile* map_file); \
+LIBCMO_EXPORT LibCmo::CK2::ObjImpls::CK ## namepart * BMFile_Get ## namepart (BMap::BMFile* map_file, LibCmo::CKDWORD idx); \
+LIBCMO_EXPORT LibCmo::CK2::ObjImpls::CK ## namepart * BMFile_Create ## namepart (BMap::BMFile* map_file, LibCmo::CKSTRING name);
+
+VISITOR_DECL(Group)
+VISITOR_DECL(3dObject)
+VISITOR_DECL(Mesh)
+VISITOR_DECL(Material)
+VISITOR_DECL(Texture)
+
+#undef VISITOR_DECL
+
 #pragma endregion
 
 #pragma region BMMeshTransition
 
+LIBCMO_EXPORT BMap::BMMeshTransition* BMMeshTrans_New();
+LIBCMO_EXPORT void BMMeshTrans_Delete(BMap::BMMeshTransition* trans);
+
+LIBCMO_EXPORT void BMMeshTrans_PrepareVertexCount(BMap::BMMeshTransition* trans, LibCmo::CKDWORD count);
+LIBCMO_EXPORT LibCmo::VxMath::VxVector3* BMMeshTrans_PrepareVertex(BMap::BMMeshTransition* trans);
+LIBCMO_EXPORT void BMMeshTrans_PrepareNormalCount(BMap::BMMeshTransition* trans, LibCmo::CKDWORD count);
+LIBCMO_EXPORT LibCmo::VxMath::VxVector3* BMMeshTrans_PrepareNormal(BMap::BMMeshTransition* trans);
+LIBCMO_EXPORT void BMMeshTrans_PrepareUVCount(BMap::BMMeshTransition* trans, LibCmo::CKDWORD count);
+LIBCMO_EXPORT LibCmo::VxMath::VxVector2* BMMeshTrans_PrepareUV(BMap::BMMeshTransition* trans);
+LIBCMO_EXPORT void BMMeshTrans_PrepareMtlSlotCount(BMap::BMMeshTransition* trans, LibCmo::CKDWORD count);
+LIBCMO_EXPORT LibCmo::CK2::ObjImpls::CKMaterial** BMMeshTrans_PrepareMtlSlot(BMap::BMMeshTransition* trans);
+LIBCMO_EXPORT void BMMeshTrans_PrepareFaceCount(BMap::BMMeshTransition* trans, LibCmo::CKDWORD count);
+LIBCMO_EXPORT LibCmo::CKDWORD* BMMeshTrans_PrepareFaceVertexIndices(BMap::BMMeshTransition* trans);
+LIBCMO_EXPORT LibCmo::CKDWORD* BMMeshTrans_PrepareFaceNormalIndices(BMap::BMMeshTransition* trans);
+LIBCMO_EXPORT LibCmo::CKDWORD* BMMeshTrans_PrepareFaceUVIndices(BMap::BMMeshTransition* trans);
+LIBCMO_EXPORT LibCmo::CKDWORD* BMMeshTrans_PrepareFaceMtlSlot(BMap::BMMeshTransition* trans);
+LIBCMO_EXPORT bool BMMeshTrans_Parse(BMap::BMMeshTransition* trans, LibCmo::CK2::ObjImpls::CKMesh* write_into_mesh);
 
 #pragma endregion
 
diff --git a/BMap/BMap.cpp b/BMap/BMap.cpp
index 47c46f8..821bc6a 100644
--- a/BMap/BMap.cpp
+++ b/BMap/BMap.cpp
@@ -230,6 +230,8 @@ namespace BMap {
 				cache.emplace_back(encodings[i]);
 		}
 		m_Context->SetEncoding(cache);
+		// set default texture save mode is external
+		m_Context->SetGlobalImagesSaveOptions(LibCmo::CK2::CK_TEXTURE_SAVEOPTIONS::CKTEXTURE_EXTERNAL);
 	}
 
 	BMFile::~BMFile() {
diff --git a/LibCmo/CK2/CKFileOthers.cpp b/LibCmo/CK2/CKFileOthers.cpp
index 7b1380a..95f7c76 100644
--- a/LibCmo/CK2/CKFileOthers.cpp
+++ b/LibCmo/CK2/CKFileOthers.cpp
@@ -262,7 +262,7 @@ namespace LibCmo::CK2 {
 
 	CKFileWriter::~CKFileWriter() {}
 
-	bool LibCmo::CK2::CKFileWriter::InternalObjectAdder(ObjImpls::CKObject * obj, CKDWORD flags) {
+	bool CKFileWriter::InternalObjectAdder(ObjImpls::CKObject * obj, CKDWORD flags) {
 		if (obj == nullptr) return false;
 
 		// check whether is saved.