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Understanding the Cloning Process in NiObject and NiAVObject

This documentation provides an in-depth overview of the cloning process within the NiObject and NiAVObject classes. It details the methods responsible for cloning objects, including `Clone()`, `CopyMembers()`, and `CloneProperties()`, as well as how the cloning process is managed through `NiCloningProcess`. The information highlights the importance of sharing properties among multiple NiAVObjects and explains how properties are cloned using shared references to optimize efficiency in 3D rendering applications.

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Understanding the Cloning Process in NiObject and NiAVObject

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  1. CloningNiObject NiObject* NiObject::Clone() { NiCloningProcess kCloning; NiObject* pClone = CreateClone(kCloning); ProcessClone(kCloning); return pClone; } NiObject* NiObject::Clone(NiCloningProcess& kCloning) { NiObject* pClone = CreateClone(kCloning); ProcessClone(kCloning); return pClone; }

  2. Cloning (cont.)NiObject void NiObject::CopyMembers(NiObject* pDest, NiCloningProcess& kCloning) { kCloning.m_pkCloneMap->SetAt(this, pDest); } NiObject* NiObject::CreateSharedClone(NiCloningProcess& kCloning) { NiObject* pkClone; if (kCloning.m_pkCloneMap->GetAt(this, pkClone)) return pkClone; else return CreateClone(kCloning); }

  3. Cloning (cont.)NiAVObject • NiCloningProcess가 필요한 이유 • Property를 다수의 NiAVObject가 공유할 수 있기 때문 void NiAVObject::CloneProperties(NiAVObject* pkDest, NiPropertyList* pkList, NiCloningProcess& kCloning) { NiTListIterator kPos = pkList->GetTailPos(); while (kPos) { NiProperty* pkProperty = pkList->GetPrev(kPos); pkDest->AttachProperty((NiProperty*)pkProperty->CreateSharedClone( kCloning)); } }

  4. Clone (cont.)NiNode void NiNode::ProcessClone( NiCloningProcess& kCloning) { NiAVObject::ProcessClone(kCloning); NiObject* pkClone; bool bCloned = kCloning.m_pkCloneMap->GetAt(this, pkClone); NiNode* pkNode = (NiNode*) pkClone; const NiDynamicEffectList *pkList = &GetEffectList(); if (!pkList->IsEmpty()) pkNode->CopyEffectListClones(pkList, kCloning); … }

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