NURBSSurface Class Reference

#include <surf_api.h>

Class Description

See also

Class NURBSObject, Class NURBSTextureSurface, Template Class Tab, Class NURBSTextureChannelSet.

Description:

This class describes the properties of a NURBS surface. This includes its material ID, texture/tiling options, renderable state, open/closed state, and normal inverted state. The Evaluate() method is used to compute points and tangents on the surface.

All methods of this class are implemented by the system.

Data Members:

protected:

BOOL mGenUVs;

TRUE if the 'Generate Mapping Coordinates' checkbox is on; otherwise FALSE.

BOOL mFlipNormals;

TRUE if the surface normals are inverted; otherwise FALSE.

BOOL mRenderable;

TRUE if the surface may be rendered; otherwise FALSE.

int mMatID;

The material ID for the surface.

BOOL mClosedInU, mClosedInV;

The surface closed flags.

NURBSTextureChannelSet mTextureChannelSet;

This data member is available in release 3.0 and later only.

This is the set of texture mapping channels used by this surface.

BOOL mFlipNormals;

TRUE if normals are flipped for the surface; otherwise FALSE.

BOOL mRenderable;

TRUE if the surface is renderable; otherwise FALSE.

int mMatID;

The zero based material ID for the surface.

BOOL mClosedInU

TRUE if the surface is closed in U; otherwise FALSE.

BOOL mClosedInV;

TRUE if the surface is closed in V; otherwise FALSE.

TessApprox *mpVTess;

This data member is available in release 3.0 and later only.

Points to the TessApprox object for the viewport (optional).

TessApprox *mpRTess;

This data member is available in release 3.0 and later only.

Points to the TessApprox object for the production renderer (optional).

TessApprox *mpRTessDisp;

This data member is available in release 3.0 and later only.

Points to the TessApprox object for displacement mapping (optional).

TessApprox *mpVTessCurve;

This data member is available in release 3.0 and later only.

Points to the TessApprox object for tesselating curves in the viewports(optional).

TessApprox *mpRTessCurve;

This data member is available in release 3.0 and later only.

Points to the TessApprox object for tesselating curves in the production renderer (optional).

Inheritance diagram for NURBSSurface:

Public Member Functions
void *	GetSurfCache ()
void	SetSurfCache (void *pCache)
DllExport	NURBSSurface (void)
virtual DllExport	~NURBSSurface (void)
DllExport NURBSSurface &	operator= (const NURBSSurface &surf)
DllExport BOOL	Renderable ()
DllExport void	Renderable (BOOL state)
DllExport BOOL	FlipNormals ()
DllExport void	FlipNormals (BOOL state)
DllExport BOOL	GenerateUVs (int channel=0)
DllExport void	SetGenerateUVs (BOOL state, int channel=0)
DllExport int	MatID ()
DllExport void	MatID (int id)
DllExport Point2	GetTextureUVs (TimeValue t, int i, int channel=0)
DllExport void	SetTextureUVs (TimeValue t, int i, Point2 pt, int channel=0)
DllExport void	GetTileOffset (TimeValue t, float &ut, float &vt, float &uo, float &vo, float &a, int channel=0)
DllExport void	SetTileOffset (TimeValue t, float ut, float vt, float uo, float vo, float a, int channel=0)
DllExport NURBSTextureSurface &	GetTextureSurface (int channel)
DllExport void	SetTextureSurface (int channel, NURBSTextureSurface &texSurf)
DllExport int	NumChannels ()
DllExport int	GetChannelFromIndex (int index)
DllExport BOOL	IsClosedInU (void)
DllExport BOOL	IsClosedInV (void)
DllExport BOOL	Evaluate (TimeValue t, double u, double v, Point3 &pt, Point3 &dPdU, Point3 &dPdV)
DllExport BOOL	Evaluate (TimeValue t, double u, double v, Point3 &pt, Point3 &dPdU, Point3 &dPdV, Point3 &d2PdU2, Point3 &d2PdV2, Point3 &d2PdUdV)
DllExport void	GetParameterRange (TimeValue t, double &uMin, double &uMax, double &vMin, double &vMax)
DllExport BOOL	GetNURBSData (TimeValue t, int &degreeInU, int &degreeInV, int &numInU, int &numInV, NURBSCVTab &cvs, int &numKnotsInU, int &numKnotsInV, NURBSKnotTab &uKnots, NURBSKnotTab &vKnots)
DllExport BOOL	GetCLPTextureSurfaceData (TimeValue t, int channel, int &degreeInU, int &degreeInV, int &numInU, int &numInV, NURBSCVTab &cvs, int &numKnotsInU, int &numKnotsInV, NURBSKnotTab &uKnots, NURBSKnotTab &vKnots)
DllExport int	NumTrimLoops (TimeValue t)
DllExport int	NumCurvesInLoop (TimeValue t, int loop)
DllExport BOOL	Get2dTrimCurveData (TimeValue t, int loop, int curve, int &degree, int &numCVs, NURBSCVTab &cvs, int &numKnots, NURBSKnotTab &knots)
DllExport BOOL	Get3dTrimCurveData (TimeValue t, int loop, int curve, int &degree, int &numCVs, NURBSCVTab &cvs, int &numKnots, NURBSKnotTab &knots)
DllExport TessApprox *	GetProdTess (NURBSTessType type=kNTessSurface)
DllExport TessApprox *	GetViewTess (NURBSTessType type=kNTessSurface)
DllExport void	SetProdTess (TessApprox &tess, NURBSTessType type=kNTessSurface)
DllExport void	SetViewTess (TessApprox &tess, NURBSTessType type=kNTessSurface)
DllExport void	ClearViewTess (NURBSTessType type=kNTessSurface)
DllExport void	ClearProdTess (NURBSTessType type=kNTessSurface)
Public Member Functions inherited from NURBSObject
DllExport	NURBSObject (void)
virtual DllExport	~NURBSObject (void)
DllExport NURBSObject &	operator= (const NURBSObject &pt)
DllExport void	SetName (const MCHAR *name)
DllExport const MCHAR *	GetName (void)
DllExport NURBSType	GetType ()
DllExport NURBSKind	GetKind ()
DllExport NURBSId	GetId ()
DllExport void	SetId (NURBSId id)
DllExport void	SetNSet (NURBSSet *nset)
DllExport void	SetObject (Object *object)
DllExport Object *	GetMAXObject ()
DllExport NURBSSet *	GetNSet ()
DllExport int	GetIndex ()
DllExport BOOL	IsSelected ()
DllExport void	SetSelected (BOOL set)

Protected Attributes
NURBSTextureChannelSet	mTextureChannelSet
BOOL	mFlipNormals
BOOL	mRenderable
int	mMatID
BOOL	mClosedInU
BOOL	mClosedInV
TessApprox *	mpVTess
TessApprox *	mpRTess
TessApprox *	mpRTessDisp
TessApprox *	mpVTessCurve
TessApprox *	mpRTessCurve
void *	mpSurfCache
Protected Attributes inherited from NURBSObject
MCHAR	mName [NURBS_NAME_SIZE]
NURBSType	mType
NURBSKind	mKind
NURBSId	mId
Object *	mpObject
NURBSSet *	mpNSet
BOOL	mSelected

Friends
class	NURBSCVSurface
class	NURBSPointSurface
class	NURBSBlendSurface
class	NURBSNBlendSurface
class	NURBSOffsetSurface
class	NURBSXFormSurface
class	NURBSMirrorSurface
class	NURBSCapSurface
class	NURBSIsoCurve
class	NURBSProjectVectorCurve
class	NURBSProjectNormalCurve
class	NURBSSurfSurfIntersectionCurve
class	NURBSCurveOnSurface
class	NURBSPointCurveOnSurface
class	NURBSMultiCurveTrimSurface
class	NURBSTextureChannel
class	NURBSTextureChannelSet

Additional Inherited Members
Static Public Member Functions inherited from MaxHeapOperators
static UtilExport void *	operator new (size_t size)
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static UtilExport void	aligned_free (void *ptr)
	Frees a block of memory that was allocated with aligned_malloc/aligned_realloc. More...
Protected Member Functions inherited from NURBSObject
DllExport void	Clean (NURBSIdTab ids)

Constructor & Destructor Documentation

DllExport NURBSSurface

(

void

)

Remarks

Constructor. The surface is initialized as follows:

mKind = kNURBSSurface;

mFlipNormals = FALSE;

mRenderable = TRUE;

mMatID = 1;

mpVTess = NULL;

mpRTess = NULL;

mpRTessDisp = NULL;

mpVTessCurve = NULL;

mpRTessCurve = NULL;

virtual DllExport ~NURBSSurface ( void  )

virtual

Remarks

Destructor. Any TessApprox objects are freed.

Member Function Documentation

void* GetSurfCache ( )

inline

{ return mpSurfCache; }

void SetSurfCache ( void *  pCache )

inline

{ mpSurfCache = pCache; }

DllExport NURBSSurface& operator=

(

const NURBSSurface &

surf

)

Remarks

Assignment operator.

Parameters:

const NURBSSurface& curve

The surface to assign.

DllExport BOOL Renderable

(

)

Remarks

Returns TRUE if the surface is renderable; otherwise FALSE.

DllExport void Renderable

(

BOOL

state

)

Remarks

Sets the renderable flag to the specified state.

Parameters:

BOOL state

TRUE for renderable; FALSE for non-renderable.

DllExport BOOL FlipNormals

(

)

Remarks

Returns the state of the flip normals flag.

DllExport void FlipNormals

(

BOOL

state

)

Remarks

Set the state of the flip normals flag.

Parameters:

BOOL state

TRUE if the normals should be flipped; FALSE for not flipped.

DllExport BOOL GenerateUVs

(

int

channel = 0

)

Remarks

Returns TRUE if the generate UV mapping coordinates flag is set for the specified channel; otherwise FALSE.

Parameters:

int channel = 0

The channel. This is a number in the range 0 and 98 which correspond to 1 to 99 in the user interface.

DllExport void SetGenerateUVs	(	BOOL	state,
		int	channel = 0
	)

Remarks

Sets the state of the generate UV mapping coordinates flag.

Parameters:

BOOL state

TRUE for on; FALSE for off.

int channel = 0

The channel. This is a number in the range 0 and 98 which correspond to 1 to 99 in the user interface.

DllExport int MatID

(

)

Remarks

Returns the material ID.

DllExport void MatID

(

int

id

)

Remarks

Sets the mateials ID to the specified value.

Parameters:

int id

Specifies the material ID to set.

DllExport Point2 GetTextureUVs	(	TimeValue	t,
		int	i,
		int	channel = 0
	)

Remarks

Returns the specified texture coordinate.

Parameters:

TimeValue t

The time to get the texture UVs.

int i

The zero based index of the coordinate to return. This value must be >=0 and < 4.

int channel = 0

The channel. This is a number in the range 0 and 98 which correspond to 1 to 99 in the user interface.

DllExport void SetTextureUVs	(	TimeValue	t,
		int	i,
		Point2	pt,
		int	channel = 0
	)

Remarks

Set the specified texture coordinate to the specified value.

Parameters:

TimeValue t

The time to set the texture UVs.

int i

The zero based index of the texture coordinate to set. This value must be >= 0 and < 4.

Point2 pt

The texture coordinate value to set.

int channel = 0

The channel. This is a number in the range 0 and 98 which correspond to 1 to 99 in the user interface.

DllExport void GetTileOffset	(	TimeValue	t,
		float &	ut,
		float &	vt,
		float &	uo,
		float &	vo,
		float &	a,
		int	channel = 0
	)

Remarks

Retrieves the texture tiling and offset values for the surface.

Parameters:

TimeValue t

The time to get the tile offset.

float &ut

The tiling value in the U direction.

float &vt

The tiling value in the V direction.

float &uo

The offset value in the U direction.

float &vo

The offset value in the V direction.

int channel = 0

The channel. This is a number in the range 0 and 98 which correspond to 1 to 99 in the user interface.

DllExport void SetTileOffset	(	TimeValue	t,
		float	ut,
		float	vt,
		float	uo,
		float	vo,
		float	a,
		int	channel = 0
	)

Remarks

Sets the texture tiling and offset values for the surface.

Parameters:

TimeValue t

The time to set the tile offset.

float ut

The tiling value in the U direction.

float vt

The tiling value in the V direction.

float uo

The offset value in the U direction.

float vo

The offset value in the V direction.

int channel = 0

The channel. This is a number in the range 0 and 98 which correspond to 1 to 99 in the user interface.

DllExport NURBSTextureSurface& GetTextureSurface

(

int

channel

)

Remarks

Returns a reference to the texture surface used by this surface for the specified channel.

Parameters:

int channel

The channel. This is a number in the range 0 and 98 which correspond to 1 to 99 in the user interface.

DllExport void SetTextureSurface	(	int	channel,
		NURBSTextureSurface &	texSurf
	)

Remarks

Sets the texture surface used by this surface for the specified channel.

Parameters:

int channel

The channel. This is a number in the range 0 and 98 which correspond to 1 to 99 in the user interface.

NURBSTextureSurface& texSurf

The texture surface to set.

DllExport int NumChannels

(

)

Remarks

Returns the number of channels used by the surface.

DllExport int GetChannelFromIndex

(

int

index

)

Remarks

Returns a channel number corresponding to the specified index into the NURBSTextureChannelSet.

Parameters:

int index

The zero based index into the NURBSTextureChannelSet.

DllExport BOOL IsClosedInU

(

void

)

Remarks

Returns TRUE if the surface is closed in the U direction; otherwise FALSE.

DllExport BOOL IsClosedInV

(

void

)

Remarks

Returns TRUE if the surface is closed in the V direction; otherwise FALSE.

DllExport BOOL Evaluate	(	TimeValue	t,
		double	u,
		double	v,
		Point3 &	pt,
		Point3 &	dPdU,
		Point3 &	dPdV
	)

Remarks

Retrieves the point on the surface, and the u and v derivatives based on the parameters u and v.

Parameters:

TimeValue t

The time at which to evaluate the surface.

double u

The value at which to evaluate the surface in u. This value must be between the uMin and uMax as returned from GetParameterRange().

double v

The value at which to evaluate the surface in v. This value must be between the vMin and vMax as returned from GetParameterRange().

Point3& pt

The point on the surface.

Point3& dPdU

The derivative along u.

Point3& dPdV

The derivative along v.

Returns

TRUE if the method was able to evaluate the surface; otherwise FALSE.

DllExport BOOL Evaluate	(	TimeValue	t,
		double	u,
		double	v,
		Point3 &	pt,
		Point3 &	dPdU,
		Point3 &	dPdV,
		Point3 &	d2PdU2,
		Point3 &	d2PdV2,
		Point3 &	d2PdUdV
	)

Remarks

Retrieves the point on the surface, and the u and v derivatives and second derivatives based on the parameters u and v.

Parameters:

TimeValue t

The time at which to evaluate the surface.

double u

The value at which to evaluate the surface in u. This value must be between the uMin and uMax as returned from GetParameterRange().

double v

The value at which to evaluate the surface in v. This value must be between the vMin and vMax as returned from GetParameterRange().

Point3& pt

The point on the surface.

Point3& dPdU

The derivative along u.

Point3& dPdV

The derivative along v.

Point3& d2PdU2

The second derivative along u.

Point3& d2PdV2

The second derivative along v.

Point3& d2PdUdV

Returns

TRUE if the method was able to evaluate the surface; otherwise FALSE.

DllExport void GetParameterRange	(	TimeValue	t,
		double &	uMin,
		double &	uMax,
		double &	vMin,
		double &	vMax
	)

Remarks

Retrieves the minimum and maximum valid values for u and v as passed to Evaluate().

Parameters:

TimeValue t

The time at which to get the parameter range.

double& uMin

The minimum value in u is returned here.

double& uMax

The maximum value in v is returned here.

double& vMin

The minimum value in u is returned here.

double& vMax

The maximum value in v is returned here.

DllExport BOOL GetNURBSData	(	TimeValue	t,
		int &	degreeInU,
		int &	degreeInV,
		int &	numInU,
		int &	numInV,
		NURBSCVTab &	cvs,
		int &	numKnotsInU,
		int &	numKnotsInV,
		NURBSKnotTab &	uKnots,
		NURBSKnotTab &	vKnots
	)

Remarks

Retrieves data about the NURBSSurface at the specified time.

Parameters:

TimeValue t

The time at which to get the NURBS information.

int& degreeInU

The degree of the surface in U.

int& degreeInV

The degree of the surface in V.

int& numInU

The number of CVs in U.

int& numInV

The number of CVs in V.

NURBSCVTab& cvs

The table of CVs. Note: typedef Tab<NURBSControlVertex> NURBSCVTab;

int& numKnotsInU

The number of knots in U.

int& numKnotsInV

The number of knots in V.

NURBSKnotTab uKnots

A table of knots in U. Note: typedef Tab<double> NURBSKnotTab;

NURBSKnotTab vKnots

A table of knots in V.

Returns

TRUE if the data was retrieved; otherwise FALSE.

DllExport BOOL GetCLPTextureSurfaceData	(	TimeValue	t,
		int	channel,
		int &	degreeInU,
		int &	degreeInV,
		int &	numInU,
		int &	numInV,
		NURBSCVTab &	cvs,
		int &	numKnotsInU,
		int &	numKnotsInV,
		NURBSKnotTab &	uKnots,
		NURBSKnotTab &	vKnots
	)

Remarks

This method retrieves the Chord Length Parameterization Texture Surface data.

Parameters:

TimeValue t

The time at which to retrieve the data.

int channel

The texture channel. This is a number in the range 0 and 98 which correspond to 1 to 99 in the user interface.

int& degreeInU

The degree of the surface in U.

int& degreeInV

The degree in V.

int& numInU

The number of CVs in U.

int& numInV

The number of CVs in V.

NURBSCVTab& cvs

The table of CVs. Note: typedef Tab<NURBSControlVertex> NURBSCVTab;

int& numKnotsInU

The number of knots in U.

int& numKnotsInV

The number of knots in V.

NURBSKnotTab uKnots

A table of knots in U. Note: typedef Tab<double> NURBSKnotTab;

NURBSKnotTab vKnots

A table of knots in V.

Returns

TRUE if the data was retrieved; otherwise FALSE.

DllExport int NumTrimLoops

(

TimeValue

t

)

Remarks

Returns the number of trim loops at the specified time. Each loop may be made up of several curves.

Parameters:

TimeValue t

The time at which to return the number.

DllExport int NumCurvesInLoop	(	TimeValue	t,
		int	loop
	)

Remarks

Returns the number of curves in the specified trim loop.

Parameters:

TimeValue t

The time at which to return the number.

int loop

The zero based index of the trim loop.

DllExport BOOL Get2dTrimCurveData	(	TimeValue	t,
		int	loop,
		int	curve,
		int &	degree,
		int &	numCVs,
		NURBSCVTab &	cvs,
		int &	numKnots,
		NURBSKnotTab &	knots
	)

Remarks

Retrieves data about the specified 2D trim curve in use by the surface.

Parameters:

TimeValue t

The time at which to retrieve the data.

int loop

The zero based index of the trim loop.

int curve

The zero based index of the trim curve within the loop.

int& degree

The degree of the curve is returned here.

int& numCVs

The number of CVs.

NURBSCVTab& cvs

The table of CVs. Note: typedef Tab<NURBSControlVertex> NURBSCVTab;

int& numKnots

The number of knots.

NURBSKnotTab knots

A table of knots. Note: typedef Tab<double> NURBSKnotTab;

Returns

TRUE if the data was retrieved; otherwise FALSE.

DllExport BOOL Get3dTrimCurveData	(	TimeValue	t,
		int	loop,
		int	curve,
		int &	degree,
		int &	numCVs,
		NURBSCVTab &	cvs,
		int &	numKnots,
		NURBSKnotTab &	knots
	)

Remarks

Retrieves data about the specified 2D trim curve in use by the surface.

Parameters:

TimeValue t

The time at which to retrieve the data.

int loop

The zero based index of the trim loop.

int curve

The zero based index of the trim curve within the loop.

int& degree

The degree of the curve is returned here.

int& numCVs

The number of CVs.

NURBSCVTab& cvs

The table of CVs. Note: typedef Tab<NURBSControlVertex> NURBSCVTab;

int& numKnots

The number of knots.

NURBSKnotTab knots

A table of knots. Note: typedef Tab<double> NURBSKnotTab;

Returns

TRUE if the data was retrieved; otherwise FALSE.

DllExport TessApprox* GetProdTess

(

NURBSTessType

type = kNTessSurface

)

Remarks

Returns a pointer to the TessApprox object used for production rendering of the specified type.

Parameters:

NURBSTessType type=kNTessSurface

The tesselation type. See NURBSTess Types.

DllExport TessApprox* GetViewTess

(

NURBSTessType

type = kNTessSurface

)

Remarks

Returns a pointer to the TessApprox object used for viewport rendering of the specified type.

Parameters:

NURBSTessType type=kNTessSurface

The tesselation type. See NURBSTess Types.

DllExport void SetProdTess	(	TessApprox &	tess,
		NURBSTessType	type = kNTessSurface
	)

Remarks

Sets the TessApprox object used for production rendering of the specified type.

Parameters:

TessApprox& tess

The object to set.

NURBSTessType type=kNTessSurface

The tesselation type. See NURBSTess Types.

DllExport void SetViewTess	(	TessApprox &	tess,
		NURBSTessType	type = kNTessSurface
	)

Remarks

Sets the TessApprox object used for viewport rendering of the specified type.

Parameters:

TessApprox& tess

The object to set.

NURBSTessType type=kNTessSurface

The tesselation type. See NURBSTess Types.

DllExport void ClearViewTess

(

NURBSTessType

type = kNTessSurface

)

Remarks

Clears (deletes) the TessApprox object used for viewport rendering of the specified type.

Parameters:

NURBSTessType type=kNTessSurface

The tesselation type. See NURBSTess Types.

DllExport void ClearProdTess

(

NURBSTessType

type = kNTessSurface

)

Remarks

Clears (deletes) the TessApprox object used for production rendering of the specified type.

Parameters:

NURBSTessType type=kNTessSurface

The tesselation type. See NURBSTess Types.

Operators:

Friends And Related Function Documentation

friend class NURBSCVSurface

friend

friend class NURBSPointSurface

friend

friend class NURBSBlendSurface

friend

friend class NURBSNBlendSurface

friend

friend class NURBSOffsetSurface

friend

friend class NURBSXFormSurface

friend

friend class NURBSMirrorSurface

friend

friend class NURBSCapSurface

friend

friend class NURBSIsoCurve

friend

friend class NURBSProjectVectorCurve

friend

friend class NURBSProjectNormalCurve

friend

friend class NURBSSurfSurfIntersectionCurve

friend

friend class NURBSCurveOnSurface

friend

friend class NURBSPointCurveOnSurface

friend

friend class NURBSMultiCurveTrimSurface

friend

friend class NURBSTextureChannel

friend

friend class NURBSTextureChannelSet

friend

Member Data Documentation

NURBSTextureChannelSet mTextureChannelSet

protected

BOOL mFlipNormals

protected

BOOL mRenderable

protected

int mMatID

protected

BOOL mClosedInU

protected

BOOL mClosedInV

protected

TessApprox* mpVTess

protected

TessApprox* mpRTess

protected

TessApprox* mpRTessDisp

protected

TessApprox* mpVTessCurve

protected

TessApprox* mpRTessCurve

protected

void* mpSurfCache

protected