perf: AcDbX3dSolid 几何改为懒重建

- 新增 m_bNeedCreate 标志与 EnsureCreated()：dwgInFields 与拷贝构造
  不再立即 ReCreate，延迟到首次访问几何时重建
- 开图时不再对每个单元逐个走 SAT 临时文件（acisOut/acisIn），
  显著降低开图耗时；Clone 也省掉一次重建
- 所有读取 m_pSolid/m_pSubDMesh 的入口统一走 EnsureCreated：
  GetNative3dSolid / GetDraw3dSolid / GetNativeSubDMesh /
  GetDrawSubDMesh / GetDrawSubDMesh2D / GetCentoridPoint
- GetDrawSubDMesh 补 m_pSubDMesh 空指针保护
- TransformBy 保持原有行为（参数变更后必须重建）

SourceCode/Code2026/CoreLibrary/AcDbX3dSolid.cpp

@@ -219,6 +219,7 @@ AcDbX3dSolid::AcDbX3dSolid(void)
 
 	m_pSolidDraw = NULL;
 	m_pSolid = NULL;
+	m_bNeedCreate = false;
 #if ARX > 17
 	m_pSubDMesh = NULL;
 	m_pSubDMeshDraw = NULL;
@@ -274,11 +275,11 @@ AcDbX3dSolid::AcDbX3dSolid(const AcDbX3dSolid& xSolid)
 
 	m_pSolid = NULL;
 	m_pSolidDraw = NULL;
+	m_bNeedCreate = true;			//延迟到首次访问几何时重建
 #if ARX > 17
 	m_pSubDMesh = NULL;
 	m_pSubDMeshDraw = NULL;
 #endif
-	ReCreate();
 }
 
 AcDbX3dSolid::~AcDbX3dSolid(void)
@@ -3846,11 +3847,13 @@ bool  AcDbX3dSolid::CreateLadder(const AcGePoint3d& ptFr,const AcGeVector3d& vtD
 
 AcDb3dSolid* AcDbX3dSolid::GetNative3dSolid() const
 {
+	EnsureCreated();
 	return m_pSolid;
 }
 
 AcDb3dSolid* AcDbX3dSolid::GetDraw3dSolid() const
 {
+	EnsureCreated();
 	if (m_pSolid != NULL)
 	{
 		AcDb3dSolid* pSolid = (AcDb3dSolid*)m_pSolid->clone();
@@ -3883,6 +3886,7 @@ AcDb3dSolid* AcDbX3dSolid::GetDraw3dSolid() const
 #if ARX > 17
 AcDbSubDMesh* AcDbX3dSolid::GetNativeSubDMesh() const
 {
+	EnsureCreated();
 	return m_pSubDMesh;
 }
 
@@ -3890,6 +3894,8 @@ AcDbSubDMesh* AcDbX3dSolid::GetDrawSubDMesh() const
 {
 	if (m_eType != kFrom3JS) return NULL;
 
+	EnsureCreated();
+	if (!m_pSubDMesh) return NULL;
 	return (AcDbSubDMesh*)m_pSubDMesh->clone();
 
 	// 移动和旋转操作在Group内完成，这里属于预留
@@ -3925,6 +3931,7 @@ AcDbSubDMesh* AcDbX3dSolid::GetDrawSubDMesh() const
 
 void AcDbX3dSolid::GetDrawSubDMesh2D(AcArray<AcGeLineSeg3d> &ar) const
 {
+	EnsureCreated();
 	ar.append(m_pSubDMesh2Ds);
 }
 
@@ -4610,9 +4617,21 @@ Acad::ErrorStatus AcDbX3dSolid::ReCreate()
 	default:
 		break;
 	}
+
+	m_bNeedCreate = false;
 	return Acad::eOk;
 }
 
+void AcDbX3dSolid::EnsureCreated() const
+{
+	if (!m_bNeedCreate)
+		return;
+
+	//先清标志再重建，避免 ReCreate 内部再次触发 EnsureCreated 造成递归
+	m_bNeedCreate = false;
+	const_cast<AcDbX3dSolid*>(this)->ReCreate();
+}
+
 bool AcDbX3dSolid::GetLoftReducerSides(CString& sPoint2ds,AcGePoint2dArray& arTopPts,AcGePoint2dArray& arBomPts)
 {
 	CString sTemp = sPoint2ds;
@@ -4750,7 +4769,7 @@ Acad::ErrorStatus AcDbX3dSolid::dwgInFields (AcDbDwgFiler* pFiler)
 			CoreTools::PolylineToString(&poly, m_sszPoint2ds, false);
 	}
 
-	ReCreate();
+	m_bNeedCreate = true;			//延迟到首次访问几何时重建，避免开图时逐个走 SAT 临时文件
 
 	return pFiler->filerStatus();
 }
@@ -5458,10 +5477,7 @@ bool AcDbX3dSolid::ByJson(const SHJson::WValue &v)
 AcGePoint3d AcDbX3dSolid::GetCentoridPoint()
 {
 	AcGePoint3d pt;
-	if (!m_pSolid)
-	{
-		ReCreate();
-	}
+	EnsureCreated();
 	if (m_pSolid)
 	{
 		double v;

SourceCode/Code2026/inc/AcDbX3dSolid.h

@@ -77,6 +77,8 @@ public:
 	//ext: Create(kBox,3,10.0,10.0,12.0);
 	bool Create(AcDbX3dSolid::Primitive eType,const AcGePoint3d& ptOrg,const AcGeVector3d& vtZ,int n,...);
 	Acad::ErrorStatus ReCreate();
+	//按需重建几何：m_bNeedCreate 为真时才调用 ReCreate，供所有读取 m_pSolid/m_pSubDMesh 的入口使用
+	void EnsureCreated() const;
 
 	//起点长度管廊段
 	bool CreateEarthWorm(const AcGePoint3d& ptOrg,const AcGeVector3d& vtZ,LPCTSTR pszScr,double dLen,const AcGeVector3d& vtLast,const AcGeVector3d& vtNext);
@@ -253,6 +255,7 @@ protected:
 
 	//以上数据创建的模型,->不序列化
 	AcDb3dSolid*		m_pSolid;				//原始solid元,不序列化
+	mutable bool		m_bNeedCreate;			//几何待重建标志,不序列化
 	AcDbVoidPtrArray	m_arCurPtrs;			//创建的二维曲线
 
 #if ARX > 17