vrml2_base.cpp

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/*
 * This program source code file is part of KiCad, a free EDA CAD application.
 *
 * Copyright (C) 2015-2016 Cirilo Bernardo <[email protected]>
 * Copyright (C) 2021 KiCad Developers, see AUTHORS.txt for contributors.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, you may find one here:
 * http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
 * or you may search the http://www.gnu.org website for the version 2 license,
 * or you may write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
 */

#include <iostream>
#include <sstream>
#include <utility>
#include <wx/string.h>
#include <wx/filename.h>
#include <wx/log.h>

#include "vrml2_base.h"
#include "vrml2_transform.h"
#include "vrml2_shape.h"
#include "vrml2_appearance.h"
#include "vrml2_material.h"
#include "vrml2_faceset.h"
#include "vrml2_lineset.h"
#include "vrml2_pointset.h"
#include "vrml2_coords.h"
#include "vrml2_norms.h"
#include "vrml2_color.h"
#include "vrml2_box.h"
#include "vrml2_switch.h"
#include "vrml2_inline.h"
#include "plugins/3dapi/ifsg_all.h"


SCENEGRAPH* LoadVRML( const wxString& aFileName, bool useInline );


WRL2BASE::WRL2BASE() : WRL2NODE()
{
 m_useInline = false;
 m_Type = WRL2NODES::WRL2_BASE;
}


WRL2BASE::~WRL2BASE()
{
 std::map< std::string, SGNODE* >::iterator iS = m_inlineModels.begin();
 std::map< std::string, SGNODE* >::iterator eS = m_inlineModels.end();

 while( iS != eS )
 {
 SGNODE* np = iS->second;

 // destroy any orphaned Inline{} node data
 if( np && nullptr == S3D::GetSGNodeParent( np ) )
 S3D::DestroyNode( np );

 ++iS;
 }

 m_inlineModels.clear();
}


bool WRL2BASE::SetParent( WRL2NODE* aParent, bool /* doUnlink */ )
{
 wxCHECK_MSG( false, false, wxT( "Attempt to set parent on WRL2BASE node." ) );
}


void WRL2BASE::SetEnableInline( bool enable )
{
 m_useInline = enable;
}


bool WRL2BASE::GetEnableInline( void )
{
 return m_useInline;
}


SGNODE* WRL2BASE::GetInlineData( const std::string& aName )
{
 if( aName.empty() )
 return nullptr;

 std::map< std::string, SGNODE* >::iterator dp = m_inlineModels.find( aName );

 if( dp != m_inlineModels.end() )
 return dp->second;

 wxString tname;

 if( aName.compare( 0, 7, "file://" ) == 0 )
 {
 if( aName.length() <= 7 )
 return nullptr;

 tname = wxString::FromUTF8Unchecked( aName.substr( 7 ).c_str() );
 }
 else
 {
 tname = wxString::FromUTF8Unchecked( aName.c_str() );
 }

 wxFileName fn;
 fn.Assign( tname );

 if( fn.IsRelative() && !m_dir.empty() )
 {
 wxString fname = wxString::FromUTF8Unchecked( m_dir.c_str() );
 fname.append( tname );
 fn.Assign( fname );
 }

 if( !fn.Normalize() )
 {
 m_inlineModels.insert( std::pair< std::string, SGNODE* >( aName, nullptr ) );
 return nullptr;
 }

 SCENEGRAPH* sp = LoadVRML( fn.GetFullPath(), false );

 if( nullptr == sp )
 {
 m_inlineModels.insert( std::pair< std::string, SGNODE* >( aName, nullptr ) );
 return nullptr;
 }

 m_inlineModels.insert( std::pair< std::string, SGNODE* >( aName, (SGNODE*)sp ) );

 return (SGNODE*)sp;
}


std::string WRL2BASE::GetName( void )
{
 wxCHECK_MSG( false, std::string( "" ), wxT( "Attempt to extract name from base node." ) );
}


bool WRL2BASE::SetName( const std::string& aName )
{
 wxCHECK_MSG( false, false, wxT( "Attempt to set name of base node." ) );
}


bool WRL2BASE::Read( WRLPROC& proc )
{
 wxCHECK_MSG( proc.GetVRMLType() == WRLVERSION::VRML_V2, false,
 wxT( "No open file or file is not a VRML2 file." ) );

 WRL2NODE* node = nullptr;
 m_dir = proc.GetParentDir();

 while( ReadNode( proc, this, &node ) && !proc.eof() );

 if( proc.eof() )
 return true;

 return false;
}


bool WRL2BASE::isDangling( void )
{
 // the base node is never dangling
 return false;
}


bool WRL2BASE::implementUse( WRLPROC& proc, WRL2NODE* aParent, WRL2NODE** aNode )
{
 if( nullptr != aNode )
 *aNode = nullptr;

 wxCHECK_MSG( aParent, false, wxT( "Invalid parent." ) );

 std::string glob;

 if( !proc.ReadName( glob ) )
 {
 wxLogTrace( traceVrmlPlugin, wxT( "%s:%s:%d\n"
 "%s" ),
 __FILE__, __FUNCTION__, __LINE__ , proc.GetError() );

 return false;
 }

 WRL2NODE* ref = aParent->FindNode( glob, nullptr );

 // return 'true' - the file may be defective but it may still be somewhat OK
 if( nullptr == ref )
 {
 wxLogTrace( traceVrmlPlugin, wxT( "%s:%s:%d\n"
 " * [INFO] node '%s' not found." ),
 __FILE__, __FUNCTION__, __LINE__, glob );

 return true;
 }

 if( !aParent->AddRefNode( ref ) )
 {
 wxLogTrace( traceVrmlPlugin,
 wxT( "%s:%s:%d\n"
 " * [INFO] failed to add node '%s' (%d) to parent of type %d" ),
 __FILE__, __FUNCTION__, __LINE__, glob, ref->GetNodeType(),
 aParent->GetNodeType() );

 return false;
 }

 if( nullptr != aNode )
 *aNode = ref;

 return true;
}


bool WRL2BASE::implementDef( WRLPROC& proc, WRL2NODE* aParent, WRL2NODE** aNode )
{
 if( nullptr != aNode )
 *aNode = nullptr;

 wxCHECK_MSG( aParent, false, wxT( "Invalid parent." ) );

 std::string glob;
 WRL2NODE* lnode = nullptr;

 if( !proc.ReadName( glob ) )
 {
 wxLogTrace( traceVrmlPlugin, wxT( "%s:%s:%d\n"
 "%s" ),
 __FILE__, __FUNCTION__, __LINE__ , proc.GetError() );

 return false;
 }

 if( ReadNode( proc, aParent, &lnode ) )
 {
 if( nullptr != aNode )
 *aNode = lnode;

 if( lnode && !lnode->SetName( glob ) )
 {
 wxLogTrace( traceVrmlPlugin,
 wxT( "%s:%s:%d\n"
 " * [INFO] bad formatting (invalid name) %s." ),
 __FILE__, __FUNCTION__, __LINE__, proc.GetFilePosition() );

 return false;
 }

 return true;
 }

 return false;
}


bool WRL2BASE::ReadNode( WRLPROC& proc, WRL2NODE* aParent, WRL2NODE** aNode )
{
 // This function reads a node and stores a pointer to it in aNode.
 // A value 'true' is returned if a node is successfully read or,
 // if the node is not supported, successfully discarded. Callers
 // must always check the value of aNode when the function returns
 // 'true' since it will be NULL if the node type is not supported.

 if( nullptr != aNode )
 *aNode = nullptr;

 wxCHECK_MSG( aParent, false, wxT( "Invalid parent." ) );

 std::string glob;
 WRL2NODES ntype;

 if( !proc.ReadName( glob ) )
 {
 wxLogTrace( traceVrmlPlugin, wxT( "%s:%s:%d\n"
 "%s" ),
 __FILE__, __FUNCTION__, __LINE__ , proc.GetError() );

 return false;
 }

 // Process node name:
 // the names encountered at this point should be one of the
 // built-in node names or one of:
 // DEF, USE
 // PROTO, EXTERNPROTO
 // ROUTE
 // any PROTO or EXTERNPROTO defined name
 // since we do not support PROTO or EXTERNPROTO, any unmatched names are
 // assumed to be defined via PROTO/EXTERNPROTO and deleted according to
 // a typical pattern.

 if( !glob.compare( "USE" ) )
 {
 if( !implementUse( proc, aParent, aNode ) )
 {
 wxLogTrace( traceVrmlPlugin, wxT( "%s:%s:%d\n"
 "%s" ),
 __FILE__, __FUNCTION__, __LINE__ , proc.GetError() );

 return false;
 }

 return true;
 }

 if( !glob.compare( "DEF" ) )
 {
 if( !implementDef( proc, aParent, aNode ) )
 {
 wxLogTrace( traceVrmlPlugin, wxT( "%s:%s:%d\n"
 "%s" ),
 __FILE__, __FUNCTION__, __LINE__ , proc.GetError() );

 return false;
 }

 return true;
 }

 // pattern to skip: PROTO name list
 if( !glob.compare( "PROTO" ) )
 {
 if( !proc.ReadName( glob ) || !proc.DiscardList() )
 {
 wxLogTrace( traceVrmlPlugin, wxT( "%s:%s:%d\n"
 "%s" ),
 __FILE__, __FUNCTION__, __LINE__ , proc.GetError() );

 return false;
 }

 return true;
 }

 // pattern to skip: EXTERNPROTO name1 name2 list
 if( !glob.compare( "EXTERNPROTO" ) )
 {
 if( !proc.ReadName( glob ) || !proc.ReadName( glob ) || !proc.DiscardList() )
 {
 wxLogTrace( traceVrmlPlugin, wxT( "%s:%s:%d\n"
 "%s" ),
 __FILE__, __FUNCTION__, __LINE__ , proc.GetError() );

 return false;
 }

 return true;
 }

 // pattern to skip: ROUTE glob1 glob2 glob3
 if( !glob.compare( "ROUTE" ) )
 {
 if( !proc.ReadGlob( glob ) || !proc.ReadGlob( glob ) || !proc.ReadGlob( glob ) )
 {
 wxLogTrace( traceVrmlPlugin, wxT( "%s:%s:%d\n"
 "%s" ),
 __FILE__, __FUNCTION__, __LINE__ , proc.GetError() );

 return false;
 }

 return true;
 }

 ntype = getNodeTypeID( glob );

 wxLogTrace( traceVrmlPlugin, wxT( " * [INFO] Processing node '%s' ID: %d" ), glob, ntype );

 switch( ntype )
 {
 //
 // items to be implemented:
 //
 case WRL2NODES::WRL2_APPEARANCE:

 if( !readAppearance( proc, aParent, aNode ) )
 return false;

 break;

 case WRL2NODES::WRL2_BOX:

 if( !readBox( proc, aParent, aNode ) )
 return false;

 break;

 case WRL2NODES::WRL2_COLOR:

 if( !readColor( proc, aParent, aNode ) )
 return false;

 break;

 case WRL2NODES::WRL2_CONE:
 // XXX - IMPLEMENT
 if( !proc.DiscardNode() )
 {
 wxLogTrace( traceVrmlPlugin, wxT( " * [INFO] failed to discard %s node %s." ),
 glob, proc.GetFilePosition() );

 return false;
 }
 else
 {
 wxLogTrace( traceVrmlPlugin, wxT( " * [INFO] discarded %s node %s." ),
 glob, proc.GetFilePosition() );
 }

 break;

 case WRL2NODES::WRL2_COORDINATE:

 if( !readCoords( proc, aParent, aNode ) )
 return false;

 break;

 case WRL2NODES::WRL2_CYLINDER:
 // XXX - IMPLEMENT
 if( !proc.DiscardNode() )
 {
 wxLogTrace( traceVrmlPlugin, wxT( " * [INFO] failed to discard %s node %s." ),
 glob, proc.GetFilePosition() );

 return false;
 }
 else
 {
 wxLogTrace( traceVrmlPlugin, wxT( " * [INFO] discarded %s node %s." ),
 glob, proc.GetFilePosition() );
 }

 break;

 case WRL2NODES::WRL2_ELEVATIONGRID:
 // XXX - IMPLEMENT
 if( !proc.DiscardNode() )
 {
 wxLogTrace( traceVrmlPlugin, wxT( " * [INFO] failed to discard %s node %s." ),
 glob, proc.GetFilePosition() );

 return false;
 }
 else
 {
 wxLogTrace( traceVrmlPlugin, wxT( " * [INFO] discarded %s node %s." ),
 glob, proc.GetFilePosition() );
 }

 break;

 case WRL2NODES::WRL2_EXTRUSION:
 // XXX - IMPLEMENT
 if( !proc.DiscardNode() )
 {
 wxLogTrace( traceVrmlPlugin, wxT( " * [INFO] failed to discard %s node %s." ),
 glob, proc.GetFilePosition() );

 return false;
 }
 else
 {
 wxLogTrace( traceVrmlPlugin, wxT( " * [INFO] discarded %s node %s." ),
 glob, proc.GetFilePosition() );
 }

 break;

 case WRL2NODES::WRL2_INDEXEDFACESET:

 if( !readFaceSet( proc, aParent, aNode ) )
 return false;

 break;

 case WRL2NODES::WRL2_INDEXEDLINESET:

 if( !readLineSet( proc, aParent, aNode ) )
 return false;

 break;

 case WRL2NODES::WRL2_POINTSET:

 if( !readPointSet( proc, aParent, aNode ) )
 return false;

 break;

 case WRL2NODES::WRL2_MATERIAL:

 if( !readMaterial( proc, aParent, aNode ) )
 return false;

 break;

 case WRL2NODES::WRL2_NORMAL:

 if( !readNorms( proc, aParent, aNode ) )
 return false;

 break;

 case WRL2NODES::WRL2_SHAPE:

 if( !readShape( proc, aParent, aNode ) )
 return false;

 break;

 case WRL2NODES::WRL2_SPHERE:
 // XXX - IMPLEMENT
 if( !proc.DiscardNode() )
 {
 wxLogTrace( traceVrmlPlugin, wxT( " * [INFO] failed to discard %s node %s." ),
 glob, proc.GetFilePosition() );

 return false;
 }
 else
 {
 wxLogTrace( traceVrmlPlugin, wxT( " * [INFO] discarded %s node %s." ),
 glob, proc.GetFilePosition() );
 }

 break;

 case WRL2NODES::WRL2_SWITCH:

 if( !readSwitch( proc, aParent, aNode ) )
 return false;

 break;

 case WRL2NODES::WRL2_TRANSFORM:
 case WRL2NODES::WRL2_GROUP:

 if( !readTransform( proc, aParent, aNode ) )
 return false;

 break;

 case WRL2NODES::WRL2_INLINE:

 if( !readInline( proc, aParent, aNode ) )
 return false;

 break;

 //
 // items not implemented or for optional future implementation:
 //
 case WRL2NODES::WRL2_ANCHOR:
 case WRL2NODES::WRL2_AUDIOCLIP:
 case WRL2NODES::WRL2_BACKGROUND:
 case WRL2NODES::WRL2_BILLBOARD:
 case WRL2NODES::WRL2_COLLISION:
 case WRL2NODES::WRL2_COLORINTERPOLATOR:
 case WRL2NODES::WRL2_COORDINATEINTERPOLATOR:
 case WRL2NODES::WRL2_CYLINDERSENSOR:
 case WRL2NODES::WRL2_DIRECTIONALLIGHT:
 case WRL2NODES::WRL2_FOG:
 case WRL2NODES::WRL2_FONTSTYLE:
 case WRL2NODES::WRL2_IMAGETEXTURE:
 case WRL2NODES::WRL2_LOD:
 case WRL2NODES::WRL2_MOVIETEXTURE:
 case WRL2NODES::WRL2_NAVIGATIONINFO:
 case WRL2NODES::WRL2_NORMALINTERPOLATOR:
 case WRL2NODES::WRL2_ORIENTATIONINTERPOLATOR:
 case WRL2NODES::WRL2_PIXELTEXTURE:
 case WRL2NODES::WRL2_PLANESENSOR:
 case WRL2NODES::WRL2_POINTLIGHT:
 case WRL2NODES::WRL2_POSITIONINTERPOLATOR:
 case WRL2NODES::WRL2_PROXIMITYSENSOR:
 case WRL2NODES::WRL2_SCALARINTERPOLATOR:
 case WRL2NODES::WRL2_SCRIPT:
 case WRL2NODES::WRL2_SOUND:
 case WRL2NODES::WRL2_SPHERESENSOR:
 case WRL2NODES::WRL2_SPOTLIGHT:
 case WRL2NODES::WRL2_TEXT:
 case WRL2NODES::WRL2_TEXTURECOORDINATE:
 case WRL2NODES::WRL2_TEXTURETRANSFORM:
 case WRL2NODES::WRL2_TIMESENSOR:
 case WRL2NODES::WRL2_TOUCHSENSOR:
 case WRL2NODES::WRL2_VIEWPOINT:
 case WRL2NODES::WRL2_VISIBILITYSENSOR:
 case WRL2NODES::WRL2_WORLDINFO:
 case WRL2NODES::WRL2_INVALID:
 default:

 if( !proc.DiscardNode() )
 {
 wxLogTrace( traceVrmlPlugin, wxT( " * [INFO] failed to discard %s node %s." ),
 glob, proc.GetFilePosition() );

 return false;
 }
 else
 {
 wxLogTrace( traceVrmlPlugin, wxT( " * [INFO] discarded %s node %s." ),
 glob, proc.GetFilePosition() );
 }

 break;
 }

 return true;
}


bool WRL2BASE::Read( WRLPROC& proc, WRL2BASE* aTopNode )
{
 wxCHECK_MSG( false, false, wxT( "This method must never be invoked on a WRL2BASE object." ) );
}


bool WRL2BASE::readTransform( WRLPROC& proc, WRL2NODE* aParent, WRL2NODE** aNode )
{
 if( nullptr != aNode )
 *aNode = nullptr;

 WRL2TRANSFORM* np = new WRL2TRANSFORM( aParent );

 if( !np->Read( proc, this ) )
 {
 delete np;
 return false;
 }

 if( nullptr != aNode )
 *aNode = (WRL2NODE*) np;

 return true;
}


bool WRL2BASE::readShape( WRLPROC& proc, WRL2NODE* aParent, WRL2NODE** aNode )
{
 if( nullptr != aNode )
 *aNode = nullptr;

 WRL2SHAPE* np = new WRL2SHAPE( aParent );

 if( !np->Read( proc, this ) )
 {
 delete np;
 return false;
 }

 if( nullptr != aNode )
 *aNode = (WRL2NODE*) np;

 return true;
}


bool WRL2BASE::readAppearance( WRLPROC& proc, WRL2NODE* aParent, WRL2NODE** aNode )
{
 if( nullptr != aNode )
 *aNode = nullptr;

 WRL2APPEARANCE* np = new WRL2APPEARANCE( aParent );

 if( !np->Read( proc, this ) )
 {
 delete np;
 return false;
 }

 if( nullptr != aNode )
 *aNode = (WRL2NODE*) np;

 return true;
}


bool WRL2BASE::readMaterial( WRLPROC& proc, WRL2NODE* aParent, WRL2NODE** aNode )
{
 if( nullptr != aNode )
 *aNode = nullptr;

 WRL2MATERIAL* np = new WRL2MATERIAL( aParent );

 if( !np->Read( proc, this ) )
 {
 delete np;
 return false;
 }

 if( nullptr != aNode )
 *aNode = (WRL2NODE*) np;

 return true;
}


bool WRL2BASE::readFaceSet( WRLPROC& proc, WRL2NODE* aParent, WRL2NODE** aNode )
{
 if( nullptr != aNode )
 *aNode = nullptr;

 WRL2FACESET* np = new WRL2FACESET( aParent );

 if( !np->Read( proc, this ) )
 {
 delete np;
 return false;
 }

 if( nullptr != aNode )
 *aNode = (WRL2NODE*) np;

 return true;
}


bool WRL2BASE::readLineSet( WRLPROC& proc, WRL2NODE* aParent, WRL2NODE** aNode )
{
 if( nullptr != aNode )
 *aNode = nullptr;

 WRL2LINESET* np = new WRL2LINESET( aParent );

 if( !np->Read( proc, this ) )
 {
 delete np;
 return false;
 }

 if( nullptr != aNode )
 *aNode = (WRL2NODE*) np;

 return true;
}


bool WRL2BASE::readPointSet( WRLPROC& proc, WRL2NODE* aParent, WRL2NODE** aNode )
{
 if( nullptr != aNode )
 *aNode = nullptr;

 WRL2POINTSET* np = new WRL2POINTSET( aParent );

 if( !np->Read( proc, this ) )
 {
 delete np;
 return false;
 }

 if( nullptr != aNode )
 *aNode = (WRL2NODE*) np;

 return true;
}


bool WRL2BASE::readCoords( WRLPROC& proc, WRL2NODE* aParent, WRL2NODE** aNode )
{
 if( nullptr != aNode )
 *aNode = nullptr;

 WRL2COORDS* np = new WRL2COORDS( aParent );

 if( !np->Read( proc, this ) )
 {
 delete np;
 return false;
 }

 if( nullptr != aNode )
 *aNode = (WRL2NODE*) np;

 return true;
}


bool WRL2BASE::readNorms( WRLPROC& proc, WRL2NODE* aParent, WRL2NODE** aNode )
{
 if( nullptr != aNode )
 *aNode = nullptr;

 WRL2NORMS* np = new WRL2NORMS( aParent );

 if( !np->Read( proc, this ) )
 {
 delete np;
 return false;
 }

 if( nullptr != aNode )
 *aNode = (WRL2NODE*) np;

 return true;
}


bool WRL2BASE::readColor( WRLPROC& proc, WRL2NODE* aParent, WRL2NODE** aNode )
{
 if( nullptr != aNode )
 *aNode = nullptr;

 WRL2COLOR* np = new WRL2COLOR( aParent );

 if( !np->Read( proc, this ) )
 {
 delete np;
 return false;
 }

 if( nullptr != aNode )
 *aNode = (WRL2NODE*) np;

 return true;
}


bool WRL2BASE::readBox( WRLPROC& proc, WRL2NODE* aParent, WRL2NODE** aNode )
{
 if( nullptr != aNode )
 *aNode = nullptr;

 WRL2BOX* np = new WRL2BOX( aParent );

 if( !np->Read( proc, this ) )
 {
 delete np;
 return false;
 }

 if( nullptr != aNode )
 *aNode = (WRL2NODE*) np;

 return true;
}


bool WRL2BASE::readSwitch( WRLPROC& proc, WRL2NODE* aParent, WRL2NODE** aNode )
{
 if( nullptr != aNode )
 *aNode = nullptr;

 WRL2SWITCH* np = new WRL2SWITCH( aParent );

 if( !np->Read( proc, this ) )
 {
 delete np;
 return false;
 }

 if( nullptr != aNode )
 *aNode = (WRL2NODE*) np;

 return true;
}


bool WRL2BASE::readInline( WRLPROC& proc, WRL2NODE* aParent, WRL2NODE** aNode )
{
 if( nullptr != aNode )
 *aNode = nullptr;

 if( !m_useInline )
 {
 if( !proc.DiscardNode() )
 {
 wxLogTrace( traceVrmlPlugin, wxT( " * [INFO] failed to discard in line node %s." ),
 proc.GetFilePosition() );

 return false;
 }

 return true;
 }

 WRL2INLINE* np = new WRL2INLINE( aParent );

 if( !np->Read( proc, this ) )
 {
 delete np;
 return false;
 }

 if( nullptr != aNode )
 *aNode = (WRL2NODE*) np;

 return true;
}


SGNODE* WRL2BASE::TranslateToSG( SGNODE* aParent )
{
 if( m_Children.empty() )
 return nullptr;

 if( m_sgNode )
 {
 if( nullptr != aParent )
 {
 if( nullptr == S3D::GetSGNodeParent( m_sgNode )
 && !S3D::AddSGNodeChild( aParent, m_sgNode ) )
 {
 return nullptr;
 }
 else if( aParent != S3D::GetSGNodeParent( m_sgNode )
 && !S3D::AddSGNodeRef( aParent, m_sgNode ) )
 {
 return nullptr;
 }
 }

 return m_sgNode;
 }

 IFSG_TRANSFORM topNode( aParent );

 std::list< WRL2NODE* >::iterator sC = m_Children.begin();
 std::list< WRL2NODE* >::iterator eC = m_Children.end();
 WRL2NODES type;

 // Include only Shape and Transform nodes in the top node
 bool test = false; // set to true if there are any subnodes for display

 while( sC != eC )
 {
 type = (*sC)->GetNodeType();

 switch( type )
 {
 case WRL2NODES::WRL2_SHAPE:
 // wrap the shape in a transform
 do
 {
 IFSG_TRANSFORM wrapper( topNode.GetRawPtr() );
 SGNODE* pshape = (*sC)->TranslateToSG( wrapper.GetRawPtr() );

 if( nullptr != pshape )
 test = true;
 else
 wrapper.Destroy();

 } while( 0 );

 break;

 case WRL2NODES::WRL2_TRANSFORM:
 case WRL2NODES::WRL2_SWITCH:
 case WRL2NODES::WRL2_INLINE:

 if( nullptr != (*sC)->TranslateToSG( topNode.GetRawPtr() ) )
 test = true;

 break;

 default:
 break;
 }

 ++ sC;
 }

 if( false == test )
 {
 topNode.Destroy();
 return nullptr;
 }

 m_sgNode = topNode.GetRawPtr();

 return m_sgNode;
}