Patch Class Reference

#include <patch.h>

Class Description

See also

Class PatchMesh, Class TVPatch, Patches and Faces.

Description:

A PatchMesh is made up of a series of Patch objects derived from this class. This is similar to the way faces relate to a mesh. All methods of this class are implemented by the system.

Data Members:

int type;

The patch type. One of the following values:

PATCH_UNDEF

Undefined.

PATCH_TRI

Triangular patch.

PATCH_QUAD

Quadrilateral patch.

int v[4];

A patch can have three or four vertices based on the type. The corner vertices on a patch are referred to as a, b, c, (and if it's a quad patch d). These are ordered a, b, c, d going counter-clockwise around the patch.

int vec[8];

A patch can have six or eight vector points. The vectors are referred to as follows: ab is the vector coming out of vertex a towards b. ba is the one coming out of b towards a. bc is the vector coming out of b towards c. cb is the one coming out of c towards b, and so on.

int interior[4];

A patch can have three or four interior vertices.

Point3 aux[9];

This is used internally for triangular patches only (degree 4 control points).

int edge[4];

Pointers into the edge list. There can be three or four depending on the patch type.

DWORD smGroup;

The smoothing group. This defaults to 1. All patches are smoothed in a PatchMesh.

DWORD flags;

Patch Flags

The following value may be set.

PATCH_AUTO

Interior vertices are computed automatically if this flag is set (and normally it is set). An example of when this flag would not be set is if you were creating a primitive using patches that needed to make special interior control points to create the shape. In this case you'd clear this flag and then put whatever values you needed into the vec array.

PATCH_HIDDEN

The patch is hidden.

PATCH_LINEARMAPPING

This option is available in release 4.0 and later only.

The patch is using the old linear mapping scheme.

PATCH_USE_CRUVED_MAPPING_ON_VERTEX_COLOR

This option is available in release 4.0 and later only.

The patch is using the new curved mapping for vertex colors also.

int aux1;

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

This is used to track topology changes during editing (Edit Patch).

int aux2;

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

This is used to track topology changes during editing (PatchMesh).

Inheritance diagram for Patch:

Public Member Functions
CoreExport	Patch ()
CoreExport	Patch (int type)
CoreExport	Patch (Patch &fromPatch)
CoreExport	~Patch ()
CoreExport void	Init ()
CoreExport void	setVerts (int *vrt)
void	setVerts (int a, int b, int c)
void	setVerts (int a, int b, int c, int d)
void	setVecs (int ab, int ba, int bc, int cb, int ca, int ac)
void	setVecs (int ab, int ba, int bc, int cb, int cd, int dc, int da, int ad)
void	setInteriors (int a, int b, int c)
void	setInteriors (int a, int b, int c, int d)
int	getVert (int index)
int *	getAllVerts (void)
MtlID	getMatID ()
void	setMatID (MtlID id)
Point3	getUVW (int index) const
Point2	getUV (int index) const
bool	getVertUVW (int vert, Point3 &uvw) const
bool	getVertUV (int vert, Point2 &uv) const
Point3	BicubicSurface (PatchMesh *pMesh, const float *uu, const float *vv)
CoreExport Point3	interp (PatchMesh *pMesh, float centerU, float centerV, float centerW)
CoreExport Point3	interp (PatchMesh *pMesh, float fU, float fV)
CoreExport Point3	WUTangent (PatchMesh *pMesh, float fU, float fV, float fW)
CoreExport Point3	UVTangent (PatchMesh *pMesh, float fU, float fV, float fW)
CoreExport Point3	VWTangent (PatchMesh *pMesh, float fU, float fV, float fW)
CoreExport Point3	UTangent (PatchMesh *pMesh, float fU, float fV)
CoreExport Point3	VTangent (PatchMesh *pMesh, float fU, float fV)
CoreExport Point3	Normal (PatchMesh *pMesh, float fU, float fV, float fW)
CoreExport Point3	Normal (PatchMesh *pMesh, float fU, float fV)
CoreExport void	ComputeAux (PatchMesh *pMesh, int index)
CoreExport void	ComputeAux (PatchMesh *pMesh)
CoreExport void	computeInteriors (PatchMesh *pMesh)
CoreExport void	SetType (int iType, BOOL init=FALSE)
CoreExport Patch &	operator= (Patch &from)
CoreExport void	SetAuto (BOOL sw=TRUE)
BOOL	IsAuto ()
CoreExport void	SetHidden (BOOL sw=TRUE)
BOOL	IsHidden ()
int	WhichEdge (int v1, int v2)
int	WhichVert (int index)
CoreExport void	Dump ()
CoreExport IOResult	Save (ISave *isave)
CoreExport IOResult	Load (ILoad *iload)
Public Member Functions inherited from BaseInterfaceServer
virtual UtilExport BaseInterface *	GetInterface (Interface_ID id)
virtual UtilExport int	NumInterfaces () const
virtual UtilExport BaseInterface *	GetInterfaceAt (int i) const
virtual UtilExport	~BaseInterfaceServer ()
Public Member Functions inherited from InterfaceServer
virtual UtilExport	~InterfaceServer ()
	Destructor. More...

Public Attributes
int	type
int	v [4]
int	vec [8]
int	interior [4]
Point3	aux [9]
int	edge [4]
DWORD	smGroup
DWORD	flags
int	aux1
int	aux2

Additional Inherited Members
Static Public Member Functions inherited from MaxHeapOperators
static UtilExport void *	operator new (size_t size)
	Standard new operator used to allocate objects If there is insufficient memory, an exception will be thrown. More...
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	Standard new operator used to allocate objects if there is insufficient memory, NULL will be returned. More...
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	New operator used to allocate objects that takes the filename and line number where the new was called If there is insufficient memory, an exception will be thrown. More...
static UtilExport void *	operator new (size_t size, int block_type, const char *filename, int line)
	New operator used to allocate objects that takes the type of memory, filename and line number where the new was called If there is insufficient memory, an exception will be thrown. More...
static UtilExport void *	operator new (size_t size, const std::nothrow_t &e, const char *filename, int line)
	New operator used to allocate objects that takes the filename and line number where the new was called If there is insufficient memory, NULL will be returned. More...
static UtilExport void *	operator new (size_t size, unsigned long flags)
	New operator used to allocate objects that takes extra flags to specify special operations If there is insufficient memory, an exception will be thrown. More...
static UtilExport void *	operator new (size_t size, const std::nothrow_t &e, unsigned long flags)
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static UtilExport void *	operator new[] (size_t size)
	New operator used to allocate arrays of objects If there is insufficient memory, an exception will be thrown. More...
static UtilExport void *	operator new[] (size_t size, const std::nothrow_t &e)
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static UtilExport void *	operator new[] (size_t size, const char *filename, int line)
	New operator used to allocate arrays of objects If there is insufficient memory, an exception will be thrown. More...
static UtilExport void *	operator new[] (size_t size, int block_type, const char *filename, int line)
	New operator used to allocate arrays of objects. More...
static UtilExport void *	operator new[] (size_t size, const std::nothrow_t &e, const char *filename, int line)
	New operator used to allocate arrays of objects If there is insufficient memory, NULL will be returned. More...
static UtilExport void *	operator new[] (size_t size, unsigned long flags)
	New operator used to allocate arrays of objects If there is insufficient memory, an exception will be thrown. More...
static UtilExport void *	operator new[] (size_t size, const std::nothrow_t &e, unsigned long flags)
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static UtilExport void	operator delete (void *ptr)
	Standard delete operator used to deallocate an object If the pointer is invalid, an exception will be thrown. More...
static UtilExport void	operator delete (void *ptr, const std::nothrow_t &e)
	Standard delete operator used to deallocate an object If the pointer is invalid, nothing will happen. More...
static UtilExport void	operator delete (void *ptr, const char *filename, int line)
	Delete operator used to deallocate an object that takes the filename and line number where the delete was called If the pointer is invalid, an exception will be thrown. More...
static UtilExport void	operator delete (void *ptr, int block_type, const char *filename, int line)
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static UtilExport void	operator delete (void *ptr, unsigned long flags)
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static UtilExport void	operator delete (void *ptr, const std::nothrow_t &e, unsigned long flags)
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static UtilExport void	operator delete[] (void *ptr)
	Standard delete operator used to deallocate an array of objects If the pointer is invalid, an exception will be thrown. More...
static UtilExport void	operator delete[] (void *ptr, const std::nothrow_t &e)
	Standard delete operator used to deallocate an array of objects If the pointer is invalid, nothing will happen. More...
static UtilExport void	operator delete[] (void *ptr, const char *filename, int line)
	Delete operator used to deallocate an array of objects that takes the filename and line number where the delete was called If the pointer is invalid, an exception will be thrown. More...
static UtilExport void	operator delete[] (void *ptr, int block_type, const char *filename, int line)
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static UtilExport void	operator delete[] (void *ptr, const std::nothrow_t &e, const char *filename, int line)
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static UtilExport void	operator delete[] (void *ptr, unsigned long flags)
	Delete operator used to deallocate an array of objects that takes extra flags to specify special operations If the pointer is invalid, an exception will be thrown. More...
static UtilExport void	operator delete[] (void *ptr, const std::nothrow_t &e, unsigned long flags)
	Delete operator used to deallocate an array of objects that takes extra flags to specify special operations If the pointer is invalid, an exception will be thrown. More...
static UtilExport void *	operator new (size_t size, void *placement_ptr)
	Placement new operator. More...
static UtilExport void	operator delete (void *ptr, void *placement_ptr)
	Placement delete operator. More...
Protected Attributes inherited from BaseInterfaceServer
Tab< BaseInterface * >	interfaces

Constructor & Destructor Documentation

CoreExport Patch

(

)

Remarks

Constructor. The type is set to undefined, the smooth group is set to 1, and the flags indicate automatic interior points. Note: This constructor does not allocate arrays. Use SetType(type).

CoreExport Patch

(

int

type

)

CoreExport Patch

(

Patch &

fromPatch

)

Remarks

Constructor. The this pointer is set to the fromPatch.

CoreExport ~Patch

(

)

Remarks

Destructor.

Member Function Documentation

CoreExport void Init

(

)

Remarks

This method is used by the constructors internally. Developers should not call this method.

CoreExport void setVerts

(

int *

vrt

)

Remarks

The vertices are copied from the array passed. Based on the patch type either three or four vertices are copied.

Parameters:

int *vrt

The vertices are set to these values. These values are indices into the v array.

void setVerts ( int  a, int  b, int  c  )

inline

Remarks

Sets the vertices for Tri Patch to those passed.

Parameters:

int a, int b, int c

The vertices to set. v[0]=a; v[1]=b; v[2]=c;These values are indices into the v array.

{ assert(type == PATCH_TRI); v[0]=a; v[1]=b; v[2]=c; }

void setVerts ( int  a, int  b, int  c, int  d  )

inline

Remarks

Sets the vertices for a Quad Patch to those passed.

Parameters:

int a, int b, int c, int d

The vertices to set. v[0]=a; v[1]=b; v[2]=c; v[3] = d; These values are indices into the v array.

{ assert(type == PATCH_QUAD); v[0]=a; v[1]=b; v[2]=c; v[3]=d; }

void setVecs ( int  ab, int  ba, int  bc, int  cb, int  ca, int  ac  )

inline

Remarks

Sets the vectors for a Tri Patch to those passed.

Parameters:

int ab, int ba, int bc, int cb, int ca, int ac;

The vectors to set. vec[0]=ab; vec[1]=ba; vec[2]=bc;

vec[3]=cb; vec[4]=ca; vec[5]=ac;These values are indices into the vec array.

                                                                        {
            assert(type == PATCH_TRI);
            vec[0]=ab; vec[1]=ba; vec[2]=bc; vec[3]=cb; vec[4]=ca; vec[5]=ac;
            }

void setVecs ( int  ab, int  ba, int  bc, int  cb, int  cd, int  dc, int  da, int  ad  )

inline

Remarks

Sets the vectors for a Quad patch to those passed.

Parameters:

int ab, int ba, int bc, int cb,

int cd, int dc, int da, int ad;

The vectors to set. vec[0]=ab; vec[1]=ba; vec[2]=bc; vec[3]=cb;

vec[4]=cd; vec[5]=dc; vec[6]=da, vec[7]=ad; These values are indices into the vec array.

                                                                                        {
            assert(type == PATCH_QUAD);
            vec[0]=ab; vec[1]=ba; vec[2]=bc; vec[3]=cb; vec[4]=cd; vec[5]=dc; vec[6]=da, vec[7]=ad;
            }

void setInteriors ( int  a, int  b, int  c  )

inline

Remarks

Sets the interior vertex values for a Tri Patch.

Parameters:

The interior values to set: interior[0]=a; interior[1]=b; interior[2]=c; These values are indices into the interior array.

                                                  {
            assert(type == PATCH_TRI);
            interior[0]=a; interior[1]=b; interior[2]=c;
            }

void setInteriors ( int  a, int  b, int  c, int  d  )

inline

Remarks

Sets the interior vertex values for a Tri Patch.

Parameters:

int a, int b, int c, int d

The interior values to set: interior[0]=a; interior[1]=b; interior[2]=c; interior[3]=d; These values are indices into the interior array.

                                                         {
            assert(type == PATCH_QUAD);
            interior[0]=a; interior[1]=b; interior[2]=c; interior[3]=d;
            }

int getVert ( int  index )

inline

Remarks

Returns the vertex specified by the index.

Parameters:

int index

The vertex to retrieve. This value may be 0, 1, 2 (or 3 if it's a quad patch).

{ return v[index]; }

int* getAllVerts ( void  )

inline

Remarks

Returns a pointer to the vertex array.

{ return v; }

MtlID getMatID ( )

inline

{return (int)((flags>>FACE_MATID_SHIFT)&FACE_MATID_MASK);}

void setMatID ( MtlID  id )

inline

{flags &= 0xFFFF; flags |= (DWORD)(id<<FACE_MATID_SHIFT);}

Point3 getUVW

(

int

index

)

const

Point2 getUV

(

int

index

)

const

bool getVertUVW	(	int	vert,
		Point3 &	uvw
	)		const

bool getVertUV	(	int	vert,
		Point2 &	uv
	)		const

Point3 BicubicSurface	(	PatchMesh *	pMesh,
		const float *	uu,
		const float *	vv
	)

CoreExport Point3 interp	(	PatchMesh *	pMesh,
		float	centerU,
		float	centerV,
		float	centerW
	)

Remarks

Triangle patch interpolator. This method returns a point on the surface of the patch based on the specified u, v and w values. The u, v, w values are barycentric coordinates. u+v+w = 1.0. If u is 1, and v and w are 0, the point is at the first vertex. If u is 0, v is 1, and w is 0, then the point is at the second vertex. If u and v are 0 and w is 1 then the point is at the third vertex. Varying positions between these values represent different positions on the patch.

Parameters:

PatchMesh *pMesh

Points to the PatchMesh to interpolate.

float centerU, float centerV, float centerW

The barycentric coordinates.

Returns

A point on the surface of the patch.

CoreExport Point3 interp	(	PatchMesh *	pMesh,
		float	fU,
		float	fV
	)

Remarks

Quadrilateral patch interpolator. This method returns a point on the surface of the patch based on the specified u and v values.

Parameters:

PatchMesh *pMesh

Points to the PatchMesh to interpolate.

float fU

The fU value in the range 0.0 to 1.0. This defines the distance along one axis of the patch.

float fV

The fV value in the range 0.0 to 1.0. This defines the distance along the other axis of the patch.

Returns

A point on the surface of the patch.

CoreExport Point3 WUTangent	(	PatchMesh *	pMesh,
		float	fU,
		float	fV,
		float	fW
	)

CoreExport Point3 UVTangent	(	PatchMesh *	pMesh,
		float	fU,
		float	fV,
		float	fW
	)

CoreExport Point3 VWTangent	(	PatchMesh *	pMesh,
		float	fU,
		float	fV,
		float	fW
	)

CoreExport Point3 UTangent	(	PatchMesh *	pMesh,
		float	fU,
		float	fV
	)

CoreExport Point3 VTangent	(	PatchMesh *	pMesh,
		float	fU,
		float	fV
	)

CoreExport Point3 Normal	(	PatchMesh *	pMesh,
		float	fU,
		float	fV,
		float	fW
	)

CoreExport Point3 Normal	(	PatchMesh *	pMesh,
		float	fU,
		float	fV
	)

CoreExport void ComputeAux	(	PatchMesh *	pMesh,
		int	index
	)

Remarks

This method is used internally. It compute the degree-4 alias control points.

CoreExport void ComputeAux

(

PatchMesh *

pMesh

)

CoreExport void computeInteriors

(

PatchMesh *

pMesh

)

Remarks

Whenever you are done working on a PatchMesh, this method should be called. If the interior vertices of the patch are automatic it will update them to correctly match the changes to the other vectors. This computes interior vertices considering this patch only.

Parameters:

PatchMesh* pMesh

Points to the PatchMesh to compute the interior vertices of.

CoreExport void SetType	(	int	iType,
		BOOL	init = FALSE
	)

Remarks

Sets the type of the patch to either Tri or Quad and optionally resets the arrays.

Parameters:

int iType

The patch type. One of the following values:

PATCH_TRI - Triangular Patch

PATCH_QUAD - Quadrilateral Patch

BOOL init = FALSE

If TRUE the arrays are reset to undefined; otherwise they are left unchanged. Normally this is set to FALSE.

CoreExport Patch& operator=

(

Patch &

from

)

Remarks

Assignment operator.

Parameters:

Patch& from

The patch to copy from.

CoreExport void SetAuto

(

BOOL

sw = TRUE

)

Remarks

Sets the flag controlling if interior vertices are computed automatically.

Parameters:

BOOL sw = TRUE

TRUE to set; FALSE to clear.

BOOL IsAuto ( )

inline

Remarks

Returns TRUE if the PATCH_AUTO flag is set; otherwise FALSE.

{ return (flags & PATCH_AUTO) ? TRUE : FALSE; }

CoreExport void SetHidden

(

BOOL

sw = TRUE

)

Remarks

This method is available in release 3.0 and later only.

Sets the hidden state of the patch.

Parameters:

BOOL sw = TRUE

TRUE to hide; FALSE to unhide.

BOOL IsHidden ( )

inline

Remarks

This method is available in release 3.0 and later only.

Returns TRUE if the patch is hidden; otherwise FALSE.

{ return (flags & PATCH_HIDDEN) ? TRUE : FALSE; }

int WhichEdge	(	int	v1,
		int	v2
	)

Remarks

This method is available in release 4.0 and later only.

This method provides an easy way to find out which edge of a patch uses two vertices. Simply supply the two vertices of the desired edge and call this method.

Parameters:

int v1, int v2

The index of the two vertices.

Returns

The index of the edge within the patch (0 - 2 for triangular patches, 0 - 3 for quad patches).

CAUTION: Be sure to check the return value before using it for an index

• If the two vertices supplied are not used as an edge on this patch, -1 is returned.

int WhichVert

(

int

index

)

Remarks

This method is available in release 4.0 and later only.

This method provides an easy way to find out which corner of a patch uses a given vertex. Simply supply the vertex index and call this method.

Parameters:

int index

The index of the vertex.

Returns

The corner index of the given vertex within the patch (0 - 2 for triangular patches, 0 - 3 for quad patches).

CAUTION: Be sure to check the return value before using it for an index

• If the vertex supplied is not used as a corner on this patch, -1 is returned.

CoreExport void Dump

(

)

Remarks

This may be called to dump the patch mesh structure via DebugPrint(). See Troubleshooting.

Operators:

CoreExport IOResult Save

(

ISave *

isave

)

CoreExport IOResult Load

(

ILoad *

iload

)

Member Data Documentation

int type

int v[4]

int vec[8]

int interior[4]

Point3 aux[9]

int edge[4]

DWORD smGroup

DWORD flags

int aux1

int aux2