diff --git a/LibCmo/CK2/CKFile.hpp b/LibCmo/CK2/CKFile.hpp
index 43ed04c..6821a60 100644
--- a/LibCmo/CK2/CKFile.hpp
+++ b/LibCmo/CK2/CKFile.hpp
@@ -240,7 +240,27 @@ namespace LibCmo::CK2 {
 		CKERROR Save(CKSTRING u8_filename);
 
 	protected:
-		bool m_Done;
+		/**
+		 * @brief A helper function to check whether given file can be written.
+		 * @param filename[in] The name of file to be wriiten
+		 * @return CKERROR::CK_OK if can write.
+		*/
+		CKERROR PrepareFile(CKSTRING filename);
+		/**
+		 * @brief Internal used Object Adder.
+		 * 
+		 * This function is used by AddSavedObject() and Copy from reader constructor.
+		 * This function accept a object pointer, and try adding them.
+		 * And set m_IncludedFiles and m_ObjectsHashTable properly.
+		 * 
+		 * @param obj The pointer to added object.
+		 * @param flags The flag used when saving this object.
+		 * @return True if success.
+		*/
+		bool InternalObjectAdder(ObjImpls::CKObject* obj, CKDWORD flags = CK_STATESAVE_ALL);
+
+	protected:
+		bool m_Done;	/**< True if this writer is already written into file. A written CKFileWriter can no be written again. */
 		/**
 		 * @brief True if this writer is not allowed to add objects.
 		 * @remark
@@ -269,8 +289,6 @@ namespace LibCmo::CK2 {
 		XContainer::XBitArray m_AlreadySavedMask; /**< Field recording saved object id. If this object is saved, set m_AlreadySavedMask[id] to true. Also used to check whether object already is in save list. */
 		CKFileInfo m_FileInfo; /**< Headers summary */
 
-		CKERROR PrepareFile(CKSTRING filename);
-
 		CKContext* m_Ctx;
 		CKFileVisitor m_Visitor;
 	};
diff --git a/LibCmo/CK2/CKFileOthers.cpp b/LibCmo/CK2/CKFileOthers.cpp
index edd1d15..7b1380a 100644
--- a/LibCmo/CK2/CKFileOthers.cpp
+++ b/LibCmo/CK2/CKFileOthers.cpp
@@ -244,35 +244,17 @@ namespace LibCmo::CK2 {
 
 #pragma region Deep Assign
 
-			// copy object and calc max id
-			CK_ID maxid = 0;
+			// call internal object adder one by one
 			for (const auto& item : reader->GetFileObjects()) {
 				CKFileObject obj;
 
 				// skip if invalid
 				if (item.ObjPtr == nullptr) continue;
 
-				// set obj ptr
-				obj.ObjPtr = item.ObjPtr;
-
-				// set other data
-				obj.ObjectId = obj.ObjPtr->GetID();
-				obj.ObjectCid = obj.ObjPtr->GetClassID();
-				obj.Data = nullptr;	// blank statechunk
-				obj.SaveFlags = CK_STATESAVE_ALL;
-				XContainer::NSXString::FromCKSTRING(obj.Name, obj.ObjPtr->GetName());
-
-				// update max id
-				maxid = std::max(maxid, obj.ObjectId);
-
-				// insert
-				m_FileObjects.emplace_back(std::move(obj));
-
+				// try add
+				InternalObjectAdder(item.ObjPtr);
 			}
 
-			// set max id
-			m_SaveIDMax = maxid;
-
 #pragma endregion
 
 		}
@@ -280,8 +262,7 @@ namespace LibCmo::CK2 {
 
 	CKFileWriter::~CKFileWriter() {}
 
-	bool CKFileWriter::AddSavedObject(ObjImpls::CKObject* obj, CKDWORD flags) {
-		if (m_Done || m_DisableAddingObject) return false;
+	bool LibCmo::CK2::CKFileWriter::InternalObjectAdder(ObjImpls::CKObject * obj, CKDWORD flags) {
 		if (obj == nullptr) return false;
 
 		// check whether is saved.
@@ -306,11 +287,19 @@ namespace LibCmo::CK2 {
 		return true;
 	}
 
+	bool CKFileWriter::AddSavedObject(ObjImpls::CKObject* obj, CKDWORD flags) {
+		if (m_Done || m_DisableAddingObject) return false;
+
+		// call internal adder
+		return InternalObjectAdder(obj, flags);
+	}
+
 	bool CKFileWriter::AddSavedObjects(const XContainer::XObjectPointerArray& objarray, CKDWORD flags) {
 		if (m_Done || m_DisableAddingObject) return false;
 		
 		bool ret = true;
 		for (auto obj : objarray) {
+			// call AddSavedObject one by one
 			if (!AddSavedObject(obj, flags)) {
 				ret = false;
 			}
diff --git a/LibCmo/CK2/ObjImpls/CKMesh.cpp b/LibCmo/CK2/ObjImpls/CKMesh.cpp
index d3762c5..8c49e02 100644
--- a/LibCmo/CK2/ObjImpls/CKMesh.cpp
+++ b/LibCmo/CK2/ObjImpls/CKMesh.cpp
@@ -130,7 +130,7 @@ namespace LibCmo::CK2::ObjImpls {
 			CKBYTE* rawbuf = static_cast<CKBYTE*>(buf.get());
 			
 			// reserve length data
-			CKDWORD* reservedBufSize = reinterpret_cast<CKDWORD*>(rawbuf);
+			CKDWORD* reservedBufDwordSize = reinterpret_cast<CKDWORD*>(rawbuf);
 			rawbuf += CKSizeof(CKDWORD);
 
 			// write vertex position
@@ -188,7 +188,7 @@ namespace LibCmo::CK2::ObjImpls {
 			CKDWORD realConsumedSize = rawbuf - static_cast<CKBYTE*>(buf.get());
 			// assign to reserved length field
 			// length also include length indicator it self
-			*reservedBufSize = realConsumedSize;
+			*reservedBufDwordSize = realConsumedSize / CKSizeof(CKDWORD);
 			// notify buffer real consumed size
 			buf.get_deleter().SetConsumedSize(realConsumedSize);
 
diff --git a/Unvirt/StructFormatter.cpp b/Unvirt/StructFormatter.cpp
index a6e07ec..ca7dc61 100644
--- a/Unvirt/StructFormatter.cpp
+++ b/Unvirt/StructFormatter.cpp
@@ -324,8 +324,6 @@ namespace Unvirt::StructFormatter {
 		fprintf(stdout, "\t0x%" PRIxCKDWORD " bytes\tColors\n", obj->GetVertexCount() * CKSizeof(LibCmo::CKDWORD));
 		PrintPointer(obj->GetVertexSpecularColors());
 		fprintf(stdout, "\t0x%" PRIxCKDWORD " bytes\tSpecularColors\n", obj->GetVertexCount() * CKSizeof(LibCmo::CKDWORD));
-		PrintPointer(obj->GetVertexWeights());
-		fprintf(stdout, "\t0x%" PRIxCKDWORD " bytes\tWeights\n", obj->GetVertexCount() * CKSizeof(LibCmo::CKFLOAT));
 		
 		// face data
 		fputs("== Face ==\n", stdout);