Geometric shape formed by extruding a circle along a 3D spine. More...

#include <Inventor/nodes/SoCircularExtrusion.h>

Inheritance diagram for SoCircularExtrusion:

Public Types
enum	SpineSimplificationMode { DEFAULT , RESPECT_MATERIALS }

Public Types inherited from SoBaseExtrusion
enum	ScaleMode { DEFAULT , SPINE_ONLY , SECTION_ONLY , NONE }

enum	ExtrusionMode { SMOOTH = 0 , BASIC = 1 , SMOOTH_WITHOUT_SELF_INTERSECTIONS = 2 }

Public Types inherited from SoShape
enum	ShapeType { POINTS , LINES , POLYGONS , TEXT }
	Basic type for antialiased rendering for this shape (Do not consider the SoDrawStyle property currently in the state). More...

Public Member Functions
virtual SoType	getTypeId () const
	Returns the type identifier for this specific instance.

	SoCircularExtrusion ()
	Constructor.

Public Member Functions inherited from SoShape
virtual SbBool	affectsState () const
	Overrides default method on SoNode.

ShapeType	getShapeType ()
	Gets the current shape Full Scene Antialiasing type.

Public Member Functions inherited from SoNode
virtual void	setOverride (const SbBool state)
	Turns the override flag on or off.

virtual SbBool	isOverride () const
	Returns the state of the override flag.

virtual SoNode *	copy (SbBool copyConnections=FALSE) const
	Creates and returns an exact copy of the node.

virtual void	touch ()
	Marks an instance as modified, simulating a change to it.

Public Member Functions inherited from SoFieldContainer
void	setToDefaults ()
	Sets all fields in this object to their default values.

SbBool	hasDefaultValues () const
	Returns TRUE if all of the object's fields have their default values.

SbBool	fieldsAreEqual (const SoFieldContainer *fc) const
	Returns TRUE if this object's fields are exactly equal to fc's fields.

void	copyFieldValues (const SoFieldContainer *fc, SbBool copyConnections=FALSE)
	Copies the contents of fc's fields into this object's fields.

SoNONUNICODE SbBool	set (const char *fieldDataString)
	Sets one or more fields in this object to the values specified in the given string, which should be a string in the Open Inventor file format.

SbBool	set (const SbString &fieldDataString)
	Sets one or more fields in this object to the values specified in the given string, which should be a string in the Open Inventor file format.

void	get (SbString &fieldDataString)
	Returns the values of the fields of this object in the Open Inventor ASCII file format in the given string.

virtual int	getFields (SoFieldList &list) const
	Appends references to all of this object's fields to resultList, and returns the number of fields appended.

virtual int	getAllFields (SoFieldList &list) const
	Returns a list of fields, including the eventIn's and eventOut's.

virtual SoField *	getField (const SbName &fieldName) const
	Returns a the field of this object whose name is fieldName.

virtual SoField *	getEventIn (const SbName &fieldName) const
	Returns a the eventIn with the given name.

virtual SoField *	getEventOut (const SbName &fieldName) const
	Returns the eventOut with the given name.

SbBool	getFieldName (const SoField *field, SbName &fieldName) const
	Returns the name of the given field in the fieldName argument.

SbBool	enableNotify (SbBool flag)
	Notification at this Field Container is enabled (if flag == TRUE) or disabled (if flag == FALSE).

SbBool	isNotifyEnabled () const
	Notification is the process of telling interested objects that this object has changed.

virtual void	setUserData (void *data)
	Sets application data.

void *	getUserData (void) const
	Gets user application data.

Public Member Functions inherited from SoBase
virtual SbName	getName () const
	Returns the name of an instance.

virtual void	setName (const SbName &name)
	Sets the name of an instance.

void	setSynchronizable (const bool b)
	Sets this to be a ScaleViz synchronizable object.

bool	isSynchronizable () const
	Gets the ScaleViz synchronizable state of this object.

Public Member Functions inherited from SoRefCounter
void	ref () const
	Adds a reference to an instance.

void	unref () const
	Removes a reference from an instance.

void	unrefNoDelete () const
	unrefNoDelete() should be called when it is desired to decrement the reference count, but not delete the instance if this brings the reference count to zero.

int	getRefCount () const
	Returns current reference count.

void	lock () const
	lock this instance.

void	unlock () const
	unlock this instance.

Public Member Functions inherited from SoTypedObject
SbBool	isOfType (const SoType &type) const
	Returns TRUE if this object is of the type specified in type or is derived from that type.

template<typename TypedObjectClass >
SbBool	isOfType () const
	Returns TRUE if this object is of the type of class TypedObjectClass or is derived from that class.

Static Public Member Functions
static SoType	getClassTypeId ()
	Returns the type identifier for this class.

Static Public Member Functions inherited from SoBaseExtrusion
static SoType	getClassTypeId ()
	Returns the type identifier for this class.

Static Public Member Functions inherited from SoShape
static SoType	getClassTypeId ()
	Returns the type identifier for this class.

static SbBool	isPrimitiveRestartAvailable (SoState *state=NULL)
	Returns TRUE if the primitive restart feature is available.

Static Public Member Functions inherited from SoNode
static SoType	getClassTypeId ()
	Returns the type identifier for this class.

static SoNode *	getByName (const SbName &name)
	A node's name can be set using SoBase::setName().

static int	getByName (const SbName &name, SoNodeList &list)
	A node's name can be set using SoBase::setName().

Static Public Member Functions inherited from SoFieldContainer
static SoType	getClassTypeId ()
	Returns the type of this class.

Static Public Member Functions inherited from SoBase
static SoType	getClassTypeId ()
	Returns type identifier for this class.

Static Public Member Functions inherited from SoTypedObject
static SoType	getClassTypeId ()
	Returns the type identifier for this class.

Public Attributes
SoSFFloat	radius
	Radius of the circular cross-section.

SoSFVec2f	activeSection
	Defines the visible section of the spine in normalized coordinates.

SoSFEnum	spineSimplificationMode
	Defines the spine simplification behavior of the extrusion.

Public Attributes inherited from SoBaseExtrusion
SoSFBool	beginCap
	If TRUE, begin planar cap surfaces generated.

SoSFBool	endCap
	If TRUE, end planar cap surfaces generated.

SoMFVec3f	spine
	Spine points.

SoSFEnum	scaleMode
	Scaling behavior of the extrusion.

SoSFEnum	extrusionMode
	Construction behavior of the extrusion.

Public Attributes inherited from SoShape
SoSFBool	boundingBoxIgnoring
	Whether to ignore this node during bounding box traversal.

Detailed Description

Geometric shape formed by extruding a circle along a 3D spine.

The SoCircularExtrusion node is a geometric shape based on a constant radius circle cross section extruded along a three-dimensional polyline (spine). The circle center lies on the spine and the circle lies on the plane normal to the spine at each point. This is similar to specifying an SoExtrusion with a circle cross-section, which is convenient for many applications, but this node has additional advantages because it responds to the SoComplexity value.

The application can specify which caps are created using the fields beginCap and endCap. By default both caps are visible.

The application can specify the visible portion of the shape along the spine using normalized curvilinear coordinates (activeSection). By default the entire spine is visible.

The SoCircularExtrusion representation is dependent on SoComplexity::value. The shape is always simplified when the SoComplexity value is less than 1. Both the cross section (number of segments used for the circle) and the spine (number of points used for the spine) are affected by the simplification. The simplification algorithm approximates the spine by taking into account its curvature. The cross section circle is approximated by at least 10 points. With a SoComplexity value of 0 the extruded shape has the roughest representation.

Approximately the same geometry could be defined using an SoExtrusion node, but that node does not currently respond the SoComplexity value. Likewise the clipping behavior could be obtained using two SoClipPlane nodes, but SoCircularExtrusion uses less memory when the activeSection is a subset of the full spine. These two features make SoCircularExtrusion valuable when a large number of cylindrical objects must be displayed.

The scaleMode field (inherited from SoBaseExtrusion) is used to select the points that will be scaled by the current transformation (for example SoTransform), if any. Translation and rotation are applied in all cases. The options are:

DEFAULT : Every point in the generated geometry is scaled.
SPINE_ONLY : Only the spine points are scaled. The cross section points are not scaled, so the cross section shape is undistorted even is scaling is non-uniform.
SECTION_ONLY : Only the cross section points are scaled. Not currently implemented.
NONE : SoExtrusion ignores the scaling state. Not currently implemented.

The extrusionMode field (inherited from SoBaseExtrusion) is used to select the extrusion algorithm.

Limitations:
The spine polyline segments must be C0 continous, that is, the spine must be connected at joints. The following segments may be C1 discontinous but be aware that very narrow angles between consecutive polyline semgments can produce odd results with SMOOTH extrusionMode modes. This is especially noticeable when the angles between segments are very small with respect to the radius. In the following images the consecutive points A, B, C in the spine show one of these cases. The problem is at point B whose cross sections are abnormally large.

Spine

Wireframe

Shaded

NOTE: node available since Open Inventor 8.6

FILE FORMAT/DEFAULT

beginCap	TRUE
endCap	TRUE
spine	[ 0 0 0, 0 1 0 ]
scaleMode	DEFAULT
extrusionMode	SMOOTH
radius	[ 1 ]
activeSection	[ 0, 1 ]

Member Enumeration Documentation

◆ SpineSimplificationMode

enum SoCircularExtrusion::SpineSimplificationMode

Enumerator

DEFAULT

The spine simplification is done based only on geometric data.

This is sufficient if there is a single material applied to the entire extrusion, but may produce incorrect results if multiple materials are applied.

RESPECT_MATERIALS

The spine simplification is done preserving the materials applied to the spine.

Definition at line 130 of file SoCircularExtrusion.h.

Constructor & Destructor Documentation

◆ SoCircularExtrusion()

SoCircularExtrusion::SoCircularExtrusion ( )

Constructor.

Member Function Documentation

◆ getClassTypeId()

static SoType SoCircularExtrusion::getClassTypeId ( )

static

Returns the type identifier for this class.

◆ getTypeId()

virtual SoType SoCircularExtrusion::getTypeId ( ) const

virtual

Returns the type identifier for this specific instance.

Reimplemented from SoBaseExtrusion.

Member Data Documentation

◆ activeSection

SoSFVec2f SoCircularExtrusion::activeSection

Defines the visible section of the spine in normalized coordinates.

The default is (0,1) meaning that the entire spine is rendered.

Definition at line 149 of file SoCircularExtrusion.h.

◆ radius

SoSFFloat SoCircularExtrusion::radius

Radius of the circular cross-section.

The default value is 1.

Definition at line 144 of file SoCircularExtrusion.h.

◆ spineSimplificationMode

SoSFEnum SoCircularExtrusion::spineSimplificationMode

Defines the spine simplification behavior of the extrusion.

Use enum SpineSimplificationMode. Default is DEFAULT. DEFAULT means spine simplification depends only on geometry. This is appropriate in the typical case where a single material is applied to the entire extrusion. RESPECT_MATERIALS means spine simplification preserves multiple materials (if any) applied to the extrusion. This could reduce rendering performance.

Definition at line 159 of file SoCircularExtrusion.h.

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

Inventor/nodes/SoCircularExtrusion.h

Open Inventor Release 2024.1.0

Public Types

Public Member Functions

Static Public Member Functions

Public Attributes