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void CMapOutdoor::BuildQuadTree()
{
	FreeQuadTree();

	// m_wPatchCount´Â ConvertPatchSplatżˇĽ­µµ Á¤ÇŃ´Ů, ľČŔüŔ» Ŕ§ÇŘ ż©±âĽ­ ĂĽĹ©ÇŃ´Ů.
	if (0 == m_wPatchCount)
	{
		TraceError("MapOutdoor::BuildQuadTree : m_wPatchCount is zero, you must call ConvertPatchSplat before call this method.");
		return;
	}

	m_pRootNode = AllocQuadTreeNode(0, 0, m_wPatchCount - 1, m_wPatchCount - 1);
	if (!m_pRootNode)
		TraceError("CMapOutdoor::BuildQuadTree() RootNode is NULL");

	if (m_pRootNode->Size > 1)
		SubDivideNode(m_pRootNode);
}