Classes
struct	MATLIST

Enumerations
enum	SGTYPES { SGTYPE_TRANSFORM = 0 , SGTYPE_APPEARANCE , SGTYPE_COLORS , SGTYPE_COLORINDEX , SGTYPE_FACESET , SGTYPE_COORDS , SGTYPE_COORDINDEX , SGTYPE_NORMALS , SGTYPE_SHAPE , SGTYPE_END }

Functions
bool	degenerate (glm::dvec3 *pts) noexcept

bool	CalcTriangleNormals (std::vector< SGPOINT > coords, std::vector< int > &index, std::vector< SGVECTOR > &norms)

void	FormatFloat (std::string &result, double value)

void	FormatOrientation (std::string &result, const SGVECTOR &axis, double rotation)

void	FormatPoint (std::string &result, const SGPOINT &point)

void	FormatVector (std::string &result, const SGVECTOR &aVector)

void	FormatColor (std::string &result, const SGCOLOR &aColor)

bool	WritePoint (std::ostream &aFile, const SGPOINT &aPoint)

bool	WriteVector (std::ostream &aFile, const SGVECTOR &aVector)

bool	WriteColor (std::ostream &aFile, const SGCOLOR &aColor)

S3D::SGTYPES	ReadTag (std::istream &aFile, std::string &aName)
	Read the text tag of a binary cache file which is the NodeTag and unique ID number combined.

bool	ReadPoint (std::istream &aFile, SGPOINT &aPoint)

bool	ReadVector (std::istream &aFile, SGVECTOR &aVector)

bool	ReadColor (std::istream &aFile, SGCOLOR &aColor)

char const *	GetNodeTypeName (S3D::SGTYPES aType) noexcept
	Return the name of the given type of node.

bool	GetMatIndex (MATLIST &aList, SGNODE *aNode, int &aIndex)

void	INIT_SMATERIAL (SMATERIAL &aMaterial)

void	INIT_SMESH (SMESH &aMesh) noexcept

void	INIT_S3DMODEL (S3DMODEL &aModel) noexcept

void	FREE_SMESH (SMESH &aMesh) noexcept

void	FREE_S3DMODEL (S3DMODEL &aModel)

bool	Select3DModel (wxWindow aParent, S3D_CACHE aCache, wxString &prevModelSelectDir, int &prevModelWildcard, FP_3DMODEL *aModel)

bool	Configure3DPaths (wxWindow aParent, FILENAME_RESOLVER aResolver)

SGLIB_API void	GetLibVersion (unsigned char Major, unsigned char Minor, unsigned char Patch, unsigned char Revision) noexcept
	Function GetLibVersion retrieves version information of the kicad_3dsg library.

SGLIB_API S3D::SGTYPES	GetSGNodeType (SGNODE *aNode)

SGLIB_API SGNODE *	GetSGNodeParent (SGNODE *aNode)

SGLIB_API bool	AddSGNodeRef (SGNODE aParent, SGNODE aChild)

SGLIB_API bool	AddSGNodeChild (SGNODE aParent, SGNODE aChild)

SGLIB_API void	AssociateSGNodeWrapper (SGNODE aObject, SGNODE *aRefPtr)

SGLIB_API SGVECTOR	CalcTriNorm (const SGPOINT &p1, const SGPOINT &p2, const SGPOINT &p3)
	Function CalcTriNorm returns the normal vector of a triangle described by vertices p1, p2, p3.

SGLIB_API bool	WriteCache (const char aFileName, bool overwrite, SGNODE aNode, const char *aPluginInfo)
	Function WriteCache writes the SGNODE tree to a binary cache file.

SGLIB_API SGNODE *	ReadCache (const char aFileName, void aPluginMgr, bool(aTagCheck)(const char , void *))
	Function ReadCache reads a binary cache file and creates an SGNODE tree.

SGLIB_API bool	WriteVRML (const char filename, bool overwrite, SGNODE aTopNode, bool reuse, bool renameNodes)
	Function WriteVRML writes out the given node and its subnodes to a VRML2 file.

SGLIB_API void	ResetNodeIndex (SGNODE *aNode)
	Function ResetNodeIndex resets the global SG* class indices.

SGLIB_API void	RenameNodes (SGNODE *aNode)
	Function RenameNodes renames a node and all children nodes based on the current values of the global SG* class indices.

SGLIB_API void	DestroyNode (SGNODE *aNode) noexcept
	Function DestroyNode deletes the given SG* class node.

SGLIB_API S3DMODEL *	GetModel (SCENEGRAPH *aNode)
	Function GetModel creates an S3DMODEL representation of aNode (raw data, no transforms)

SGLIB_API void	Destroy3DModel (S3DMODEL **aModel)
	Function Destroy3DModel frees memory used by an S3DMODEL structure and sets the pointer to the structure to NULL.

SGLIB_API void	Free3DModel (S3DMODEL &aModel)
	Function Free3DModel frees memory used internally by an S3DMODEL structure.

SGLIB_API void	Free3DMesh (SMESH &aMesh)
	Function Free3DMesh frees memory used internally by an SMESH structure.

SGLIB_API S3DMODEL *	New3DModel (void)
	Function New3DModel creates and initializes an S3DMODEL struct.

SGLIB_API void	Init3DMaterial (SMATERIAL &aMat)
	Function Init3DMaterial initializes an SMATERIAL struct.

SGLIB_API void	Init3DMesh (SMESH &aMesh)
	Function Init3DMesh creates and initializes an SMESH struct.

Enumeration Type Documentation

◆ SGTYPES

enum S3D::SGTYPES

Enumerator
SGTYPE_TRANSFORM
SGTYPE_APPEARANCE
SGTYPE_COLORS
SGTYPE_COLORINDEX
SGTYPE_FACESET
SGTYPE_COORDS
SGTYPE_COORDINDEX
SGTYPE_NORMALS
SGTYPE_SHAPE
SGTYPE_END

Definition at line 34 of file sg_types.h.

Function Documentation

◆ AddSGNodeChild()

bool S3D::AddSGNodeChild	(	SGNODE *	aParent,
		SGNODE *	aChild
	)

Definition at line 512 of file ifsg_api.cpp.

References SGNODE::AddChildNode().

Referenced by addItems(), processFace(), WRL2APPEARANCE::TranslateToSG(), WRL2BASE::TranslateToSG(), WRL2BOX::TranslateToSG(), WRL2FACESET::TranslateToSG(), WRL2INLINE::TranslateToSG(), WRL2MATERIAL::TranslateToSG(), WRL2SHAPE::TranslateToSG(), WRL2TRANSFORM::TranslateToSG(), X3DAPP::TranslateToSG(), X3DIFACESET::TranslateToSG(), X3DSHAPE::TranslateToSG(), and X3DTRANSFORM::TranslateToSG().

◆ AddSGNodeRef()

bool S3D::AddSGNodeRef	(	SGNODE *	aParent,
		SGNODE *	aChild
	)

Definition at line 503 of file ifsg_api.cpp.

References SGNODE::AddRefNode().

Referenced by addItems(), processFace(), WRL2APPEARANCE::TranslateToSG(), WRL2BASE::TranslateToSG(), WRL2BOX::TranslateToSG(), WRL2FACESET::TranslateToSG(), WRL2INLINE::TranslateToSG(), WRL2MATERIAL::TranslateToSG(), WRL2SHAPE::TranslateToSG(), WRL2TRANSFORM::TranslateToSG(), X3DAPP::TranslateToSG(), X3DIFACESET::TranslateToSG(), X3DSHAPE::TranslateToSG(), and X3DTRANSFORM::TranslateToSG().

◆ AssociateSGNodeWrapper()

void S3D::AssociateSGNodeWrapper	(	SGNODE *	aObject,
		SGNODE **	aRefPtr
	)

Definition at line 521 of file ifsg_api.cpp.

References SGNODE::AssociateWrapper().

◆ CalcTriangleNormals()

bool S3D::CalcTriangleNormals	(	std::vector< SGPOINT >	coords,
		std::vector< int > &	index,
		std::vector< SGVECTOR > &	norms
	)

Definition at line 353 of file sg_helpers.cpp.

References calcTriad().

Referenced by SGCOORDS::CalcNormals().

◆ CalcTriNorm()

SGVECTOR S3D::CalcTriNorm	(	const SGPOINT &	p1,
		const SGPOINT &	p2,
		const SGPOINT &	p3
	)

Function CalcTriNorm returns the normal vector of a triangle described by vertices p1, p2, p3.

Definition at line 464 of file ifsg_api.cpp.

References degenerate(), SGPOINT::x, SGPOINT::y, and SGPOINT::z.

Referenced by EXPORTER_PCB_VRML::create_vrml_shell(), and vrmlToSG().

◆ Configure3DPaths()

bool S3D::Configure3DPaths	(	wxWindow *	aParent,
		FILENAME_RESOLVER *	aResolver
	)

Definition at line 46 of file 3d_cache_dialogs.cpp.

References DIALOG_SHIM::ShowQuasiModal().

Referenced by PANEL_FP_PROPERTIES_3D_MODEL::Cfg3DPath(), and DIALOG_SELECT_3DMODEL::Cfg3DPaths().

◆ degenerate()

bool S3D::degenerate ( glm::dvec3 * pts )

noexcept

Definition at line 310 of file sg_helpers.cpp.

Referenced by calcTriad(), and CalcTriNorm().

◆ Destroy3DModel()

void S3D::Destroy3DModel ( S3DMODEL ** aModel )

Function Destroy3DModel frees memory used by an S3DMODEL structure and sets the pointer to the structure to NULL.

Definition at line 403 of file ifsg_api.cpp.

References FREE_S3DMODEL().

Referenced by S3D_CACHE::load(), and S3D_CACHE_ENTRY::~S3D_CACHE_ENTRY().

◆ DestroyNode()

void S3D::DestroyNode ( SGNODE * aNode )

noexcept

Function DestroyNode deletes the given SG* class node.

This function makes it possible to safely delete an SG* node without associating the node with its corresponding IFSG* wrapper.

Definition at line 149 of file ifsg_api.cpp.

Referenced by S3D_CACHE::load(), S3D_CACHE::loadCacheData(), WRL1MATERIAL::Reclaim(), DATA::~DATA(), EXPORTER_PCB_VRML::~EXPORTER_PCB_VRML(), WRL1MATERIAL::~WRL1MATERIAL(), and WRL2BASE::~WRL2BASE().

◆ FormatColor()

void S3D::FormatColor	(	std::string &	result,
		const SGCOLOR &	aColor
	)

Definition at line 135 of file sg_helpers.cpp.

References FormatFloat(), G, and SGCOLOR::GetColor().

Referenced by SGCOLORS::WriteVRML().

◆ FormatFloat()

void S3D::FormatFloat	(	std::string &	result,
		double	value
	)

Definition at line 37 of file sg_helpers.cpp.

Referenced by FormatColor(), FormatOrientation(), FormatPoint(), FormatVector(), and SGAPPEARANCE::WriteVRML().

◆ FormatOrientation()

void S3D::FormatOrientation	(	std::string &	result,
		const SGVECTOR &	axis,
		double	rotation
	)

Definition at line 82 of file sg_helpers.cpp.

References FormatFloat(), and SGVECTOR::GetVector().

Referenced by SCENEGRAPH::WriteVRML().

◆ FormatPoint()

void S3D::FormatPoint	(	std::string &	result,
		const SGPOINT &	point
	)

Definition at line 103 of file sg_helpers.cpp.

References FormatFloat(), SGPOINT::x, SGPOINT::y, and SGPOINT::z.

Referenced by SCENEGRAPH::WriteVRML(), and SGCOORDS::WriteVRML().

◆ FormatVector()

void S3D::FormatVector	(	std::string &	result,
		const SGVECTOR &	aVector
	)

Definition at line 118 of file sg_helpers.cpp.

References FormatFloat(), SGVECTOR::GetVector(), and X.

Referenced by SGNORMALS::WriteVRML().

◆ Free3DMesh()

void S3D::Free3DMesh ( SMESH & aMesh )

Function Free3DMesh frees memory used internally by an SMESH structure.

Definition at line 421 of file ifsg_api.cpp.

References FREE_SMESH().

Referenced by GetModel().

◆ Free3DModel()

SGLIB_API void S3D::Free3DModel ( S3DMODEL & aModel )

Function Free3DModel frees memory used internally by an S3DMODEL structure.

◆ FREE_S3DMODEL()

void S3D::FREE_S3DMODEL ( S3DMODEL & aModel )

Definition at line 326 of file sg_node.cpp.

References FREE_SMESH(), S3DMODEL::m_Materials, S3DMODEL::m_MaterialsSize, S3DMODEL::m_Meshes, and S3DMODEL::m_MeshesSize.

Referenced by Destroy3DModel(), and Free3DModel().

◆ FREE_SMESH()

void S3D::FREE_SMESH ( SMESH & aMesh )

noexcept

Definition at line 288 of file sg_node.cpp.

Referenced by Free3DMesh(), and FREE_S3DMODEL().

◆ GetLibVersion()

void S3D::GetLibVersion	(	unsigned char *	Major,
		unsigned char *	Minor,
		unsigned char *	Patch,
		unsigned char *	Revision
	)

noexcept

Function GetLibVersion retrieves version information of the kicad_3dsg library.

Definition at line 447 of file ifsg_api.cpp.

References KICADSG_VERSION_MAJOR, KICADSG_VERSION_MINOR, KICADSG_VERSION_PATCH, and KICADSG_VERSION_REVISION.

◆ GetMatIndex()

bool S3D::GetMatIndex	(	MATLIST &	aList,
		SGNODE *	aNode,
		int &	aIndex
	)

Definition at line 245 of file sg_node.cpp.

References SGNODE::GetNodeType(), S3D::MATLIST::matmap, S3D::MATLIST::matorder, and SGTYPE_APPEARANCE.

Referenced by SGSHAPE::Prepare().

◆ GetModel()

S3DMODEL * S3D::GetModel ( SCENEGRAPH * aNode )

Function GetModel creates an S3DMODEL representation of aNode (raw data, no transforms)

Parameters

aNode is the node to be transcribed into an S3DMODEL representation

Returns: an S3DMODEL representation of aNode on success, otherwise NULL

Definition at line 338 of file ifsg_api.cpp.

References SGAPPEARANCE::ambient, SGAPPEARANCE::diffuse, formatMaterial(), Free3DMesh(), SGNODE::GetNodeType(), S3DMODEL::m_Materials, S3DMODEL::m_MaterialsSize, S3DMODEL::m_Meshes, S3DMODEL::m_MeshesSize, S3D::MATLIST::matmap, S3D::MATLIST::matorder, New3DModel(), SCENEGRAPH::Prepare(), SGTYPE_TRANSFORM, SGAPPEARANCE::shininess, SGAPPEARANCE::specular, and SGAPPEARANCE::transparency.

Referenced by S3D_CACHE::GetModel().

◆ GetNodeTypeName()

char const * S3D::GetNodeTypeName ( S3D::SGTYPES aType )

noexcept

Return the name of the given type of node.

Definition at line 53 of file sg_node.cpp.

References node_names.

Referenced by ReadTag().

◆ GetSGNodeParent()

◆ GetSGNodeType()

S3D::SGTYPES S3D::GetSGNodeType ( SGNODE * aNode )

Definition at line 485 of file ifsg_api.cpp.

References SGNODE::GetNodeType(), and SGTYPE_END.

Referenced by WRL2APPEARANCE::TranslateToSG(), WRL2BOX::TranslateToSG(), WRL2FACESET::TranslateToSG(), WRL2INLINE::TranslateToSG(), WRL2MATERIAL::TranslateToSG(), WRL2SHAPE::TranslateToSG(), WRL2SWITCH::TranslateToSG(), WRL2TRANSFORM::TranslateToSG(), X3DAPP::TranslateToSG(), X3DIFACESET::TranslateToSG(), X3DSHAPE::TranslateToSG(), X3DTRANSFORM::TranslateToSG(), WRL1GROUP::TranslateToSG(), and WRL1SEPARATOR::TranslateToSG().

◆ Init3DMaterial()

void S3D::Init3DMaterial ( SMATERIAL & aMat )

Function Init3DMaterial initializes an SMATERIAL struct.

Definition at line 435 of file ifsg_api.cpp.

References INIT_SMATERIAL().

◆ Init3DMesh()

void S3D::Init3DMesh ( SMESH & aMesh )

Function Init3DMesh creates and initializes an SMESH struct.

Definition at line 441 of file ifsg_api.cpp.

References INIT_SMESH().

◆ INIT_S3DMODEL()

void S3D::INIT_S3DMODEL ( S3DMODEL & aModel )

noexcept

Definition at line 282 of file sg_node.cpp.

Referenced by New3DModel().

◆ INIT_SMATERIAL()

void S3D::INIT_SMATERIAL ( SMATERIAL & aMaterial )

Definition at line 270 of file sg_node.cpp.

Referenced by Init3DMaterial().

◆ INIT_SMESH()

void S3D::INIT_SMESH ( SMESH & aMesh )

noexcept

Definition at line 276 of file sg_node.cpp.

Referenced by Init3DMesh(), and SGSHAPE::Prepare().

◆ New3DModel()

S3DMODEL * S3D::New3DModel ( void )

Function New3DModel creates and initializes an S3DMODEL struct.

Definition at line 427 of file ifsg_api.cpp.

References INIT_S3DMODEL().

Referenced by GetModel().

◆ ReadCache()

SGNODE * S3D::ReadCache	(	const char *	aFileName,
		void *	aPluginMgr,
		bool()(const char , void *)	aTagCheck
	)

Function ReadCache reads a binary cache file and creates an SGNODE tree.

Parameters

aFileName is the name of the binary cache file to be read

Returns: NULL on failure, on success a pointer to the top level SCENEGRAPH node; if desired this node can be associated with an IFSG_TRANSFORM wrapper via the IFSG_TRANSFORM::Attach() function.

Definition at line 221 of file ifsg_api.cpp.

References CLOSE_STREAM, name, OPEN_ISTREAM, and SG_VERSION_TAG.

Referenced by S3D_CACHE::loadCacheData().

◆ ReadColor()

bool S3D::ReadColor	(	std::istream &	aFile,
		SGCOLOR &	aColor
	)

Definition at line 295 of file sg_helpers.cpp.

References SGCOLOR::SetColor().

Referenced by SGAPPEARANCE::ReadCache(), and SGCOLORS::ReadCache().

◆ ReadPoint()

bool S3D::ReadPoint	(	std::istream &	aFile,
		SGPOINT &	aPoint
	)

Definition at line 267 of file sg_helpers.cpp.

References SGPOINT::x, SGPOINT::y, and SGPOINT::z.

Referenced by SCENEGRAPH::ReadCache(), and SGCOORDS::ReadCache().

◆ ReadTag()

S3D::SGTYPES S3D::ReadTag	(	std::istream &	aFile,
		std::string &	aName
	)

Read the text tag of a binary cache file which is the NodeTag and unique ID number combined.

Parameters

aFile	is a binary file open for reading.
aName	will hold the tag name on successful return.

Returns: will be the NodeType which the tag represents or S3D::SGTYPES::SGTYPE_END on failure.

Definition at line 195 of file sg_helpers.cpp.

References GetNodeTypeName(), name, SGTYPE_APPEARANCE, SGTYPE_COLORINDEX, SGTYPE_COLORS, SGTYPE_COORDINDEX, SGTYPE_COORDS, SGTYPE_END, SGTYPE_FACESET, SGTYPE_NORMALS, SGTYPE_SHAPE, and SGTYPE_TRANSFORM.

Referenced by SCENEGRAPH::ReadCache(), SGFACESET::ReadCache(), and SGSHAPE::ReadCache().

◆ ReadVector()

bool S3D::ReadVector	(	std::istream &	aFile,
		SGVECTOR &	aVector
	)

Definition at line 280 of file sg_helpers.cpp.

References SGVECTOR::SetVector().

Referenced by SCENEGRAPH::ReadCache(), and SGNORMALS::ReadCache().

◆ RenameNodes()

void S3D::RenameNodes ( SGNODE * aNode )

Function RenameNodes renames a node and all children nodes based on the current values of the global SG* class indices.

Parameters

aNode is a top level node

Definition at line 141 of file ifsg_api.cpp.

References SGNODE::ReNameNodes().

◆ ResetNodeIndex()

void S3D::ResetNodeIndex ( SGNODE * aNode )

Function ResetNodeIndex resets the global SG* class indices.

Parameters

aNode may be any valid SGNODE

Definition at line 133 of file ifsg_api.cpp.

References SGNODE::ResetNodeIndex().

◆ Select3DModel()

bool S3D::Select3DModel	(	wxWindow *	aParent,
		S3D_CACHE *	aCache,
		wxString &	prevModelSelectDir,
		int &	prevModelWildcard,
		FP_3DMODEL *	aModel
	)

Definition at line 33 of file 3d_cache_dialogs.cpp.

References DIALOG_SHIM::ShowQuasiModal().

Referenced by PANEL_FP_PROPERTIES_3D_MODEL::OnAdd3DModel().

◆ WriteCache()

bool S3D::WriteCache	(	const char *	aFileName,
		bool	overwrite,
		SGNODE *	aNode,
		const char *	aPluginInfo
	)

Function WriteCache writes the SGNODE tree to a binary cache file.

Parameters

aFileName	is the name of the file to write
overwrite	must be set to true to overwrite an existing file
aNode	is any node within the node tree which is to be written

Returns: true on success

Definition at line 157 of file ifsg_api.cpp.

References CLOSE_STREAM, OPEN_OSTREAM, SG_VERSION_TAG, and SGNODE::WriteCache().

Referenced by S3D_CACHE::saveCacheData().

◆ WriteColor()

bool S3D::WriteColor	(	std::ostream &	aFile,
		const SGCOLOR &	aColor
	)

Definition at line 180 of file sg_helpers.cpp.

References SGCOLOR::GetColor().

Referenced by SGAPPEARANCE::WriteCache(), and SGCOLORS::WriteCache().

◆ WritePoint()

bool S3D::WritePoint	(	std::ostream &	aFile,
		const SGPOINT &	aPoint
	)

Definition at line 152 of file sg_helpers.cpp.

References SGPOINT::x, SGPOINT::y, and SGPOINT::z.

Referenced by SCENEGRAPH::WriteCache(), and SGCOORDS::WriteCache().

◆ WriteVector()

bool S3D::WriteVector	(	std::ostream &	aFile,
		const SGVECTOR &	aVector
	)

Definition at line 165 of file sg_helpers.cpp.

References SGVECTOR::GetVector().

Referenced by SCENEGRAPH::WriteCache(), and SGNORMALS::WriteCache().

◆ WriteVRML()

bool S3D::WriteVRML	(	const char *	filename,
		bool	overwrite,
		SGNODE *	aTopNode,
		bool	reuse,
		bool	renameNodes
	)

Function WriteVRML writes out the given node and its subnodes to a VRML2 file.

Parameters

filename	is the name of the output file
overwrite	should be set to true to overwrite an existing VRML file
aTopNode	is a pointer to a SCENEGRAPH object representing the VRML scene
reuse	should be set to true to make use of VRML DEF/USE features

Returns: true on success

Definition at line 77 of file ifsg_api.cpp.

References CLOSE_STREAM, SGNODE::GetNodeType(), OPEN_OSTREAM, SGNODE::ReNameNodes(), SGNODE::ResetNodeIndex(), SGTYPE_TRANSFORM, and SGNODE::WriteVRML().

Referenced by EXPORTER_PCB_VRML::ExportVrmlFootprint(), Load(), LoadModel(), LoadVRML(), and EXPORTER_PCB_VRML::writeLayers().

Classes

Enumerations

Functions

Enumeration Type Documentation

◆ SGTYPES

Function Documentation

◆ AddSGNodeChild()

◆ AddSGNodeRef()

◆ AssociateSGNodeWrapper()

◆ CalcTriangleNormals()

◆ CalcTriNorm()

◆ Configure3DPaths()

◆ degenerate()

◆ Destroy3DModel()

◆ DestroyNode()

◆ FormatColor()

◆ FormatFloat()

◆ FormatOrientation()

◆ FormatPoint()

◆ FormatVector()

◆ Free3DMesh()

◆ Free3DModel()

◆ FREE_S3DMODEL()

◆ FREE_SMESH()

◆ GetLibVersion()

◆ GetMatIndex()

◆ GetModel()

◆ GetNodeTypeName()

◆ GetSGNodeParent()

◆ GetSGNodeType()

◆ Init3DMaterial()

◆ Init3DMesh()

◆ INIT_S3DMODEL()

◆ INIT_SMATERIAL()

◆ INIT_SMESH()

◆ New3DModel()

◆ ReadCache()

◆ ReadColor()

◆ ReadPoint()

◆ ReadTag()

◆ ReadVector()

◆ RenameNodes()

◆ ResetNodeIndex()

◆ Select3DModel()

◆ WriteCache()

◆ WriteColor()

◆ WritePoint()

◆ WriteVector()

◆ WriteVRML()