SoVRMLCollision Class Reference

The SoVRMLCollision class is used for collision detection with the avatar.The detailed class documentation is taken verbatim from the VRML97 standard (ISO/IEC 14772-1:1997). It is copyright The Web3D Consortium, and is used by permission of the Consortium: More...

#include <Inventor/VRMLnodes/SoVRMLCollision.h>

Inheritance diagram for SoVRMLCollision:

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 run-time type checking and "downward" casting. More...
	SoVRMLCollision (void)
	SoVRMLCollision (int numchildren)
virtual void	GLRender (SoGLRenderAction *action)
virtual void	notify (SoNotList *list)
Public Member Functions inherited from SoVRMLGroup
	SoVRMLGroup (void)
	SoVRMLGroup (int numChildren)
virtual void	doAction (SoAction *action)
virtual void	callback (SoCallbackAction *action)
virtual void	getBoundingBox (SoGetBoundingBoxAction *action)
virtual void	getMatrix (SoGetMatrixAction *action)
virtual void	rayPick (SoRayPickAction *action)
virtual void	search (SoSearchAction *action)
virtual void	write (SoWriteAction *action)
virtual void	getPrimitiveCount (SoGetPrimitiveCountAction *action)
virtual void	audioRender (SoAudioRenderAction *action)
virtual void	GLRenderBelowPath (SoGLRenderAction *action)
virtual void	GLRenderInPath (SoGLRenderAction *action)
virtual void	GLRenderOffPath (SoGLRenderAction *action)
Public Member Functions inherited from SoVRMLParent
virtual SbBool	affectsState (void) const
virtual void	addChild (SoNode *child)
virtual void	insertChild (SoNode *child, int idx)
virtual SoNode *	getChild (int idx) const
virtual int	findChild (const SoNode *child) const
virtual int	getNumChildren (void) const
virtual void	removeChild (int idx)
virtual void	removeChild (SoNode *child)
virtual void	removeAllChildren (void)
virtual void	replaceChild (int idx, SoNode *child)
virtual void	replaceChild (SoNode *old, SoNode *child)
virtual SoChildList *	getChildren (void) const
Public Member Functions inherited from SoGroup
	SoGroup (void)
	SoGroup (int nchildren)
virtual void	handleEvent (SoHandleEventAction *action)
virtual void	pick (SoPickAction *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 SoNode *	copy (SbBool copyconnections=FALSE) const
virtual void	grabEventsSetup (void)
virtual void	grabEventsCleanup (void)
virtual void	startNotify (void)
uint32_t	getNodeId (void) const
virtual void	writeInstance (SoOutput *out)
virtual SoNode *	addToCopyDict (void) const
virtual SoFieldContainer *	copyThroughConnection (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 SoField *	getField (const SbName &name) const
virtual SoField *	getEventIn (const SbName &name) const
virtual SoField *	getEventOut (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 SoAuditorList &	getAuditors (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 SoVRMLGroup
static SoType	getClassTypeId (void)
static void	initClass (void)
static void	setNumRenderCaches (int num)
static int	getNumRenderCaches (void)
Static Public Member Functions inherited from SoVRMLParent
static SoType	getClassTypeId (void)
static void	initClass (void)
static void	updateChildList (const SoNode *const *nodes, const int numnodes, SoChildList &cl)
static void	updateChildList (SoNode *nodewithsfnode, SoChildList &cl)
Static Public Member Functions inherited from SoGroup
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 SoNode *	getByName (const SbName &name)
static int	getByName (const SbName &name, SoNodeList &l)
static void	initClass (void)
static void	initClasses (void)
static uint32_t	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 SoFieldContainer *	checkCopy (const SoFieldContainer *orig)
static SoFieldContainer *	findCopy (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 SoBase *	getNamedBase (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
SoSFBool	collide
SoSFNode	proxy
SoSFTime	collideTime
Public Attributes inherited from SoVRMLGroup
SoSFEnum	renderCaching
SoSFEnum	boundingBoxCaching
SoSFEnum	renderCulling
SoSFEnum	pickCulling
SoSFVec3f	bboxCenter
SoSFVec3f	bboxSize
Public Attributes inherited from SoVRMLParent
SoMFNode	children

Protected Member Functions
virtual const SoFieldData *	getFieldData (void) const
virtual	~SoVRMLCollision ()
Protected Member Functions inherited from SoVRMLGroup
virtual	~SoVRMLGroup ()
virtual SbBool	cullTest (SoState *state)
Protected Member Functions inherited from SoVRMLParent
	SoVRMLParent (void)
	SoVRMLParent (int approxchildren)
virtual	~SoVRMLParent ()
virtual SbBool	readInstance (SoInput *in, unsigned short flags)
virtual void	copyContents (const SoFieldContainer *from, SbBool copyConn)
Protected Member Functions inherited from SoGroup
virtual	~SoGroup ()
virtual SbBool	readChildren (SoInput *in)
virtual SoNotRec	createNotRec (void)
void	setOperation (const SoNotRec::OperationType opType=SoNotRec::UNSPECIFIED, const SoNode *cc=NULL, const SoNode *pc=NULL, const int ci=-1)
Protected Member Functions inherited from SoNode
	SoNode (void)
virtual	~SoNode ()
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

Static Protected Member Functions
static const SoFieldData **	getFieldDataPtr (void)
Static Protected Member Functions inherited from SoVRMLGroup
static const SoFieldData **	getFieldDataPtr (void)
Static Protected Member Functions inherited from SoVRMLParent
static const SoFieldData **	getFieldDataPtr (void)
Static Protected Member Functions inherited from SoGroup
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 SoVRMLGroup
enum	CacheEnabled { OFF, ON, AUTO }
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 SoVRMLParent
SoMFNode	addChildren
SoMFNode	removeChildren
Protected Attributes inherited from SoGroup
SoChildList *	children
Protected Attributes inherited from SoNode
uint32_t	uniqueId
Protected Attributes inherited from SoFieldContainer
SbBool	isBuiltIn
Static Protected Attributes inherited from SoVRMLGroup
static int	numRenderCaches = 2
Static Protected Attributes inherited from SoNode
static uint32_t	nextUniqueId = 1
static int	nextActionMethodIndex = 0

Detailed Description

The SoVRMLCollision class is used for collision detection with the avatar.

The detailed class documentation is taken verbatim from the VRML97 standard (ISO/IEC 14772-1:1997). It is copyright The Web3D Consortium, and is used by permission of the Consortium:

Collision {
  eventIn      MFNode   addChildren
  eventIn      MFNode   removeChildren
  exposedField MFNode   children        []
  exposedField SFBool   collide         TRUE
  field        SFVec3f  bboxCenter      0 0 0      # (-,)
  field        SFVec3f  bboxSize        -1 -1 -1   # (0,) or -1,-1,-1
  field        SFNode   proxy           NULL
  eventOut     SFTime   collideTime
}

The Collision node is a grouping node that specifies the collision detection properties for its children (and their descendants), specifies surrogate objects that replace its children during collision detection, and sends events signalling that a collision has occurred between the avatar and the Collision node's geometry or surrogate. By default, all geometric nodes in the scene are collidable with the viewer except IndexedLineSet, PointSet, and Text. Browsers shall detect geometric collisions between the avatar (see SoVRMLNavigationInfo) and the scene's geometry and prevent the avatar from 'entering' the geometry. See 4.13.4, Collision detection and terrain following (http://www.web3d.org/x3d/specifications/vrml/ISO-IEC-14772-VRML97/part1/concepts.html#4.13.4), for general information on collision detection.

If there are no Collision nodes specified in a VRML file, browsers shall detect collisions between the avatar and all objects during navigation.

Subclause 4.6.5, Grouping and children nodes (http://www.web3d.org/x3d/specifications/vrml/ISO-IEC-14772-VRML97/part1/concepts.html#4.6.5), contains a description of the children, addChildren, and removeChildren fields and eventIns.

The Collision node's collide field enables and disables collision detection. If collide is set to FALSE, the children and all descendants of the Collision node shall not be checked for collision, even though they are drawn. This includes any descendent Collision nodes that have collide set to TRUE (i.e., setting collide to FALSE turns collision off for every node below it).

Collision nodes with the collide field set to TRUE detect the nearest collision with their descendent geometry (or proxies). When the nearest collision is detected, the collided Collision node sends the time of the collision through its collideTime eventOut. If a Collision node contains a child, descendant, or proxy (see below) that is a Collision node, and both Collision nodes detect that a collision has occurred, both send a collideTime event at the same time. A collideTime event shall be generated if the avatar is colliding with collidable geometry when the Collision node is read from a VRML file or inserted into the transformation hierarchy.

The bboxCenter and bboxSize fields specify a bounding box that encloses the Collision node's children. This is a hint that may be used for optimization purposes. The results are undefined if the specified bounding box is smaller than the actual bounding box of the children at any time. A default bboxSize value, (-1, -1, -1), implies that the bounding box is not specified and if needed shall be calculated by the browser. More details on the bboxCenter and bboxSize fields can be found in 4.6.4, Bounding boxes. (http://www.web3d.org/x3d/specifications/vrml/ISO-IEC-14772-VRML97/part1/concepts.html#4.6.4),

The collision proxy, defined in the proxy field, is any legal children node as described in 4.6.5, Grouping and children nodes, (http://www.web3d.org/x3d/specifications/vrml/ISO-IEC-14772-VRML97/part1/concepts.html#4.6.5), that is used as a substitute for the Collision node's children during collision detection. The proxy is used strictly for collision detection; it is not drawn. If the value of the collide field is TRUE and the proxy field is non-NULL, the proxy field defines the scene on which collision detection is performed. If the proxy value is NULL, collision detection is performed against the children of the Collision node. If proxy is specified, any descendent children of the Collision node are ignored during collision detection. If children is empty, collide is TRUE, and proxy is specified, collision detection is performed against the proxy but nothing is displayed. In this manner, invisible collision objects may be supported.

The collideTime eventOut generates an event specifying the time when the avatar (see SoVRMLNavigationInfo) makes contact with the collidable children or proxy of the Collision node. An ideal implementation computes the exact time of collision. Implementations may approximate the ideal by sampling the positions of collidable objects and the user. The SoVRMLNavigationInfo node contains additional information for parameters that control the avatar size.

Constructor & Destructor Documentation

SoVRMLCollision::SoVRMLCollision

(

void

)

Constructor.

SoVRMLCollision::SoVRMLCollision

(

int

numchildren

)

Constructor. numchildren is the expected number of children.

SoVRMLCollision::~SoVRMLCollision ( )

protectedvirtual

Destructor.

Member Function Documentation

SoType SoVRMLCollision::getTypeId ( void  ) const

virtual

Returns the type identification of an object derived from a class inheriting SoBase. This is used for run-time 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 pre-defined 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 toplevel superclasses for the various class groups.

Reimplemented from SoVRMLGroup.

const SoFieldData * SoVRMLCollision::getFieldData ( void  ) const

protectedvirtual

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

Reimplemented from SoVRMLGroup.

void SoVRMLCollision::GLRender ( SoGLRenderAction *  action )

virtual

Action method for the SoGLRenderAction.

This is called during rendering traversals. Nodes influencing the rendering state in any way or who wants to throw geometry primitives at OpenGL overrides this method.

Reimplemented from SoVRMLGroup.

void SoVRMLCollision::notify ( SoNotList *  l )

virtual

Notifies all auditors for this instance when changes are made.

Reimplemented from SoVRMLGroup.

Member Data Documentation

SoSFBool SoVRMLCollision::collide

Enable/disable collision.

SoSFNode SoVRMLCollision::proxy

Proxy node(s) used for collision testing.

SoSFTime SoVRMLCollision::collideTime

An eventOut sent for each collision that occurs.

---

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

• SoVRMLCollision.h
• Collision.cpp