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SoNurbsProfile Class Reference

The SoNurbsProfile class is a node for specifying smooth profile curves. More...

#include <Inventor/nodes/SoNurbsProfile.h>

Inheritance diagram for SoNurbsProfile:
SoProfile SoNode SoFieldContainer SoBase

Public Member Functions

virtual SoType getTypeId (void) const
 Returns the type identification of an object derived from a class inheriting SoBase. This is used for runtime type checking and "downward" casting. More...
 SoNurbsProfile (void)
virtual void getTrimCurve (SoState *state, int32_t &numpoints, float *&points, int &floatspervec, int32_t &numknots, float *&knotvector)
virtual void getVertices (SoState *state, int32_t &numvertices, SbVec2f *&vertices)
- Public Member Functions inherited from SoProfile
virtual void doAction (SoAction *action)
virtual void callback (SoCallbackAction *action)
virtual void GLRender (SoGLRenderAction *action)
virtual void getBoundingBox (SoGetBoundingBoxAction *action)
virtual void pick (SoPickAction *action)
virtual void getPrimitiveCount (SoGetPrimitiveCountAction *action)
- Public Member Functions inherited from SoNode
void setOverride (const SbBool state)
SbBool isOverride (void) const
void setNodeType (const NodeType type)
NodeType getNodeType (void) const
virtual SoNodecopy (SbBool copyconnections=FALSE) const
virtual SbBool affectsState (void) const
virtual void GLRenderBelowPath (SoGLRenderAction *action)
virtual void GLRenderInPath (SoGLRenderAction *action)
virtual void GLRenderOffPath (SoGLRenderAction *action)
virtual void getMatrix (SoGetMatrixAction *action)
virtual void handleEvent (SoHandleEventAction *action)
virtual void rayPick (SoRayPickAction *action)
virtual void search (SoSearchAction *action)
virtual void write (SoWriteAction *action)
virtual void audioRender (SoAudioRenderAction *action)
virtual void grabEventsSetup (void)
virtual void grabEventsCleanup (void)
virtual void startNotify (void)
virtual void notify (SoNotList *l)
SbUniqueId getNodeId (void) const
virtual SoChildListgetChildren (void) const
virtual void writeInstance (SoOutput *out)
virtual SoNodeaddToCopyDict (void) const
virtual void copyContents (const SoFieldContainer *from, SbBool copyconnections)
virtual SoFieldContainercopyThroughConnection (void) const
- Public Member Functions inherited from SoFieldContainer
void setToDefaults (void)
SbBool hasDefaultValues (void) const
SbBool fieldsAreEqual (const SoFieldContainer *container) const
void copyFieldValues (const SoFieldContainer *container, SbBool copyconnections=FALSE)
SbBool set (const char *const fielddata)
void get (SbString &fielddata)
virtual int getFields (SoFieldList &l) const
virtual int getAllFields (SoFieldList &l) const
virtual SoFieldgetField (const SbName &name) const
virtual SoFieldgetEventIn (const SbName &name) const
virtual SoFieldgetEventOut (const SbName &name) const
SbBool getFieldName (const SoField *const field, SbName &name) const
SbBool enableNotify (const SbBool flag)
SbBool isNotifyEnabled (void) const
SbBool set (const char *fielddata, SoInput *input)
void get (SbString &fielddata, SoOutput *out)
virtual SbBool validateNewFieldValue (SoField *field, void *newval)
virtual void addWriteReference (SoOutput *out, SbBool isfromfield=FALSE)
SbBool getIsBuiltIn (void) const
virtual void getFieldsMemorySize (size_t &managed, size_t &unmanaged) const
void setUserData (void *userdata) const
void * getUserData (void) const
- Public Member Functions inherited from SoBase
void ref (void) const
void unref (void) const
void unrefNoDelete (void) const
int32_t getRefCount (void) const
void touch (void)
SbBool isOfType (SoType type) const
 Returns TRUE if the type of this object is either of the same type or inherited from type. More...
virtual SbName getName (void) const
virtual void setName (const SbName &newname)
void addAuditor (void *const auditor, const SoNotRec::Type type)
void removeAuditor (void *const auditor, const SoNotRec::Type type)
const SoAuditorListgetAuditors (void) const
SbBool shouldWrite (void)
void assertAlive (void) const

Static Public Member Functions

static SoType getClassTypeId (void)
static void initClass (void)
- Static Public Member Functions inherited from SoProfile
static SoType getClassTypeId (void)
static void initClass (void)
- Static Public Member Functions inherited from SoNode
static uint32_t getCompatibilityTypes (const SoType &nodetype)
static SoType getClassTypeId (void)
static SoNodegetByName (const SbName &name)
static int getByName (const SbName &name, SoNodeList &l)
static void initClass (void)
static void initClasses (void)
static SbUniqueId getNextNodeId (void)
static int getActionMethodIndex (const SoType type)
static void getBoundingBoxS (SoAction *action, SoNode *node)
static void GLRenderS (SoAction *action, SoNode *node)
static void callbackS (SoAction *action, SoNode *node)
static void getMatrixS (SoAction *action, SoNode *node)
static void handleEventS (SoAction *action, SoNode *node)
static void pickS (SoAction *action, SoNode *node)
static void rayPickS (SoAction *action, SoNode *node)
static void searchS (SoAction *action, SoNode *node)
static void writeS (SoAction *action, SoNode *node)
static void audioRenderS (SoAction *action, SoNode *node)
static void getPrimitiveCountS (SoAction *action, SoNode *node)
- Static Public Member Functions inherited from SoFieldContainer
static void initClass (void)
static SoType getClassTypeId (void)
static void cleanupClass (void)
static void initCopyDict (void)
static void addCopy (const SoFieldContainer *orig, const SoFieldContainer *copy)
static SoFieldContainercheckCopy (const SoFieldContainer *orig)
static SoFieldContainerfindCopy (const SoFieldContainer *orig, const SbBool copyconnections)
static void copyDone (void)
- Static Public Member Functions inherited from SoBase
static void initClass (void)
 Sets up initialization for data common to all instances of this class, like submitting necessary information to the Coin type system.
static SoType getClassTypeId (void)
 This static method returns the SoType object associated with objects of this class.
static void addName (SoBase *const base, const char *const name)
static void removeName (SoBase *const base, const char *const name)
static void incrementCurrentWriteCounter (void)
static void decrementCurrentWriteCounter (void)
static SoBasegetNamedBase (const SbName &name, SoType type)
static int getNamedBases (const SbName &name, SoBaseList &baselist, SoType type)
static SbBool read (SoInput *input, SoBase *&base, SoType expectedtype)
static void setInstancePrefix (const SbString &c)
static void setTraceRefs (SbBool trace)
static SbBool getTraceRefs (void)
static SbBool connectRoute (SoInput *input, const SbName &fromnodename, const SbName &fromfieldname, const SbName &tonodename, const SbName &tofieldname)
static SbBool readRoute (SoInput *input)

Public Attributes

SoMFFloat knotVector
- Public Attributes inherited from SoProfile
SoMFInt32 index
SoSFEnum linkage

Protected Member Functions

virtual const SoFieldDatagetFieldData (void) const
virtual ~SoNurbsProfile ()
- Protected Member Functions inherited from SoProfile
 SoProfile (void)
virtual ~SoProfile ()
- Protected Member Functions inherited from SoNode
 SoNode (void)
virtual ~SoNode ()
virtual SbBool readInstance (SoInput *in, unsigned short flags)
- Protected Member Functions inherited from SoFieldContainer
 SoFieldContainer (void)
virtual ~SoFieldContainer ()
- Protected Member Functions inherited from SoBase
 SoBase (void)
virtual ~SoBase ()
virtual void destroy (void)
SbBool hasMultipleWriteRefs (void) const
SbBool writeHeader (SoOutput *out, SbBool isgroup, SbBool isengine) const
void writeFooter (SoOutput *out) const
virtual const char * getFileFormatName (void) const
virtual SoNotRec createNotRec (void)

Static Protected Member Functions

static const SoFieldData ** getFieldDataPtr (void)
- Static Protected Member Functions inherited from SoProfile
static const SoFieldData ** getFieldDataPtr (void)
- Static Protected Member Functions inherited from SoNode
static const SoFieldData ** getFieldDataPtr (void)
static void setNextActionMethodIndex (int index)
static int getNextActionMethodIndex (void)
static void incNextActionMethodIndex (void)
static void setCompatibilityTypes (const SoType &nodetype, const uint32_t bitmask)
- Static Protected Member Functions inherited from SoBase
static uint32_t getCurrentWriteCounter (void)
static void staticDataLock (void)
static void staticDataUnlock (void)

Additional Inherited Members

- Public Types inherited from SoProfile
enum  Profile { START_FIRST = SoProfileElement::START_FIRST, START_NEW = SoProfileElement::START_NEW, ADD_TO_CURRENT = SoProfileElement::ADD_TO_CURRENT }
- Public Types inherited from SoNode
enum  NodeType {
  INVENTOR = 0x0000, VRML1 = 0x0001, VRML2 = 0x0002, INVENTOR_1 = 0x0004,
  INVENTOR_2_0 = 0x0008, INVENTOR_2_1 = 0x0010, INVENTOR_2_5 = 0x0020, INVENTOR_2_6 = 0x0040,
  COIN_1_0 = 0x0080, COIN_2_0 = 0x0100, EXTENSION = 0x0200, COIN_2_2 = 0x0400,
  COIN_2_3 = 0x0800, COIN_2_4 = 0x1000, INVENTOR_5_0 = 0x2000, COIN_2_5 = 0x4000,
  COIN_3_0 = 0x8000, INVENTOR_6_0 = 0x10000, COIN_4_0 = 0x20000
- Protected Types inherited from SoBase
enum  BaseFlags { IS_ENGINE = 0x01, IS_GROUP = 0x02 }
- Protected Attributes inherited from SoNode
SbUniqueId uniqueId
- Protected Attributes inherited from SoFieldContainer
SbBool isBuiltIn
- Static Protected Attributes inherited from SoNode
static SbUniqueId nextUniqueId = 1
static int nextActionMethodIndex = 0

Detailed Description

The SoNurbsProfile class is a node for specifying smooth profile curves.

Use nodes of this type if you want to set up profiles that are smooth curves.

Use ProfileCoordinate2 for nonrational profile curves where weight is 1.0 (default), and ProfileCoordinate3 for rational profile curves to specify the weight. Weight is analogous to having magnets pulling on the curve.

A typical usage case for SoNurbsProfile is to specify NURBS trimming curves. For example:

#Inventor V2.1 ascii
ShapeHints {
Coordinate3 {
point [
-3 -3 -3, -3 -1 -3, -3 1 -3, -3 3 -3,
-1 -3 -3, -1 -1 3, -1 1 3, -1 3 -3,
1 -3 -3, 1 -1 3, 1 1 3, 1 3 -3,
3 -3 -3, 3 -1 -3, 3 1 -3, 3 3 -3
ProfileCoordinate2 {
point [ 0.0 0.0 ,
0.75 0.0,
0.75 0.75 ,
0.25 0.75 ,
0.0 0.0 ]
NurbsProfile {
index [ 0 , 1 , 2 , 3, 4 ]
knotVector [ 0, 0, 0, 0, 0.5, 1, 1, 1, 1 ]
NurbsSurface {
numUControlPoints 4
numVControlPoints 4
uKnotVector [ 0.0, 0.0, 0.0, 0.0, 1.0, 1.0, 1.0, 1.0 ]
vKnotVector [ 0.0, 0.0, 0.0, 0.0, 1.0, 1.0, 1.0, 1.0 ]
Rendering of Example Scenegraph

Note that the coordinates of the NurbsProfile live in the parametric space of the trimmed SoNurbsSurface, and that the same complexity setting (which is calculated based on the dimensions of the bounding box of the NurbsSurface) is used to determine the sampling tolerance both for the SoNurbsSurface and the SoNurbsProfile.

This means that if you want to change the tessellation of the trimming curve itself (i.e. increase or decrease the resolution of the boundaries of the "cut-out"), you should not change the SoComplexity setting but rather adapt the parametric scale in relation to the trimmed surface.

As an example, to increase the resolution of the curve in the above example, replace...

ProfileCoordinate2 {
point [ 0.0 0.0, 0.75 0.0, 0.75 0.75, 0.25 0.75, 0.0 0.0 ]

.. with...

ProfileCoordinate2 {
point [ 0.0 0.0, 7.5 0.0, 7.5 7.5, 2.5 7.5, 0.0 0.0 ]

and change the uKnotVector and vKnotVector of the NurbsSurface to be

uKnotVector [ 0.0, 0.0, 0.0, 0.0, 10, 10, 10, 10 ]
vKnotVector [ 0.0, 0.0, 0.0, 0.0, 10, 10, 10, 10 ]

However, keep in mind that increasing the accuracy of the trimming curve results in a much more complex tessellation of the trimmed surface. As a general rule of thumb, the extent of the trimming curve coordinates should never be greater than its "real" extents in relation to the trimmed surface, and often can be much lower.

If you find the above confusing, you probably do not want to use NURBS without reading up on the general concepts first. An explanation of NURBS is beyond the scope of the Coin documentation; for detailed information, refer to the specialized literature on the topic (for example "An Introduction to NURBS: With Historical Perspective" by David F. Rogers). A basic overview of curve and surface rendering using NURBS can also be found in chapter 8 of "The Inventor Mentor".


NurbsProfile {

Constructor & Destructor Documentation

◆ SoNurbsProfile()

SoNurbsProfile::SoNurbsProfile ( void  )


◆ ~SoNurbsProfile()

SoNurbsProfile::~SoNurbsProfile ( )


Member Function Documentation

◆ getTypeId()

SoType SoNurbsProfile::getTypeId ( void  ) const

Returns the type identification of an object derived from a class inheriting SoBase. This is used for runtime type checking and "downward" casting.

Usage example:

void foo(SoNode * node)
if (node->getTypeId() == SoFile::getClassTypeId()) {
SoFile * filenode = (SoFile *)node; // safe downward cast, knows the type

For application programmers wanting to extend the library with new nodes, engines, nodekits, draggers or others: this method needs to be overridden in all subclasses. This is typically done as part of setting up the full type system for extension classes, which is usually accomplished by using the predefined macros available through for instance Inventor/nodes/SoSubNode.h (SO_NODE_INIT_CLASS and SO_NODE_CONSTRUCTOR for node classes), Inventor/engines/SoSubEngine.h (for engine classes) and so on.

For more information on writing Coin extensions, see the class documentation of the top level superclasses for the various class groups.

Reimplemented from SoProfile.

◆ getFieldData()

const SoFieldData * SoNurbsProfile::getFieldData ( void  ) const

Returns a pointer to the class-wide field data storage object for this instance. If no fields are present, returns NULL.

Reimplemented from SoProfile.

◆ getTrimCurve()

void SoNurbsProfile::getTrimCurve ( SoState state,
int32_t &  numpoints,
float *&  points,
int floatspervec,
int32_t &  numknots,
float *&  knotvector 

Return points and knotvector of the state.

Implements SoProfile.

◆ getVertices()

void SoNurbsProfile::getVertices ( SoState state,
int32_t &  numvertices,
SbVec2f *&  vertices 

Return vertex set of state.

Implements SoProfile.

Member Data Documentation

◆ knotVector

SoMFFloat SoNurbsProfile::knotVector

Knot values for the NURBS curve.

The documentation for this class was generated from the following files: