The LOD node specifies various levels of detail or complexity for a given object, and provides hints allowing browsers to automatically choose the appropriate version of the object based on the distance from the user. More...

#include <H3D/LOD.h>

Inheritance diagram for H3D::LOD:

Public Member Functions
	LOD (Inst< AddChildren > _addChildren=0, Inst< RemoveChildren > _removeChildren=0, Inst< MFChild > _children=0, Inst< SFNode > _metadata=0, Inst< SFBound > _bound=0, Inst< SFInt32 > _level_changed=0, Inst< SFVec3f > _bboxCenter=0, Inst< SFVec3f > _bboxSize=0, Inst< SFVec3f > _center=0, Inst< SFBool > _forceTransitions=0, Inst< MFFloat > _range=0)
	Constructor.

virtual void	render ()
	Render the children.

virtual void	traverseSG (TraverseInfo &ti)
	Traverse the scenegraph. More...

virtual bool	lineIntersect (const Vec3f &from, const Vec3f &to, LineIntersectResult &result)
	Detect intersection between a line segment and a Node. More...

virtual void	closestPoint (const Vec3f &p, NodeIntersectResult &result)
	Find closest point on Node to p. More...

virtual bool	movingSphereIntersect (H3DFloat radius, const Vec3f &from, const Vec3f &to, NodeIntersectResult &result)
	Detect collision between a moving sphere and the Node. More...

Public Member Functions inherited from H3D::MatrixTransform
	MatrixTransform (Inst< AddChildren > _addChildren=0, Inst< RemoveChildren > _removeChildren=0, Inst< MFChild > _children=0, Inst< SFNode > _metadata=0, Inst< SFBound > _bound=0, Inst< SFVec3f > _bboxCenter=0, Inst< SFVec3f > _bboxSize=0, Inst< SFTransformedBound > _transformedBound=0, Inst< SFMatrix4f > _matrix=0, Inst< SFMatrix4f > _accumulatedForward=0, Inst< SFMatrix4f > _accumulatedInverse=0)
	Constructor.

void	multiplyGLMatrix ()
	Multiply the currently active OpenGL matrix with the matrix of this node.

Public Member Functions inherited from H3D::X3DGroupingNode
	X3DGroupingNode (Inst< AddChildren > _addChildren=0, Inst< RemoveChildren > _removeChildren=0, Inst< MFChild > _children=0, Inst< SFNode > _metadata=0, Inst< SFBound > _bound=0, Inst< SFVec3f > _bboxCenter=0, Inst< SFVec3f > _bboxSize=0)
	Constructor.

virtual	~X3DGroupingNode ()
	Destructor.

virtual void	initialize ()
	Sets up the bound field using the bboxCenter and bboxSize fields. More...

Public Member Functions inherited from H3D::X3DChildNode
	X3DChildNode (Inst< SFNode > _metadata=0)
	Constructor.

Public Member Functions inherited from H3D::X3DNode
	X3DNode (Inst< SFNode > _metadata=0)
	Constructor.

X3DMetadataObject *	getMetadataByName (const string &_name)
	Given a name, the first X3DMetadataObject in the metadata field that matches that name is returned. More...

Public Member Functions inherited from H3D::Node
	Node ()
	Constructor.

virtual Node *	clone (bool deepCopy=true, DeepCopyMap *deepCopyMap=NULL)
	Returns a new instance of this node type with the same state as this one. More...

virtual	~Node ()
	Destructor.

X3DPrototypeInstance *	getProtoInstanceParent ()
	If this node is the root node in the proto body of a X3DPrototypeInstance then this will return that node. More...

void	setProtoInstanceParent (X3DPrototypeInstance *p)
	Set the X3DPrototypeInstance this node is the the root node if applicaple.

virtual string	defaultXMLContainerField ()
	Returns the default xml containerField attribute value. More...

virtual Field *	getField (const string &_name) const
	return a pointer to the field specified by name within this instance

int	addDestructCallback (void(func)(Node , void ), void args)
	Add a callback function to be run on destruction of node. More...

int	removeDestructCallback (void(func)(Node , void ), void args)
	Add a callback function to be run on destruction of node. More...

Public Member Functions inherited from H3D::H3DBoundedObject
	H3DBoundedObject (Inst< SFBound > _bound=0)
	Constructor.

Public Member Functions inherited from H3D::H3DDisplayListObject
	H3DDisplayListObject (Inst< DisplayList > _displayList=0)
	Constructor.

Public Attributes
H3DUniquePtr< SFInt32 >	level_changed
	The LOD node generates a level_changed event with value i where the value of i identifies which level was activated for display. More...

H3DUniquePtr< SFInt32 >	display_index
	This field is only accessible in C++.

H3DUniquePtr< SFVec3f >	center
	The center field is a translation offset in the local coordinate system that specifies the centre of the LOD node for distance calculations. More...

H3DUniquePtr< SFBool >	forceTransitions
	The forceTransitions field specifies whether browsers are allowed to disregard level distances in order to provide better performance. More...

H3DUniquePtr< MFFloat >	range
	The range field specifies the ideal distances at which to switch between the levels. More...

Public Attributes inherited from H3D::MatrixTransform
H3DUniquePtr< SFMatrix4f >	matrix
	The transformation matrix. More...

H3DUniquePtr< SFMatrix4f >	accumulatedForward
	The accumulated forward transform matrix, i.e. More...

H3DUniquePtr< SFMatrix4f >	accumulatedInverse
	The accumulated inverse transform matrix, i.e. More...

H3DUniquePtr< SFTransformedBound >	transformedBound
	This is the same as the bound field, but with the transformation applied to the bound. More...

Public Attributes inherited from H3D::X3DGroupingNode
bool	use_union_bound
	if true a route will be set up between the bound field of the nodes in children and the bound field of the grouping node. More...

H3DUniquePtr< AddChildren >	addChildren
	The addChildren event appends nodes to the children field of a grouping node. More...

H3DUniquePtr< RemoveChildren >	removeChildren
	The removeChildren event removes nodes from the children field of the grouping node . More...

H3DUniquePtr< MFChild >	children
	The nodes that are grouped together by this node. More...

Public Attributes inherited from H3D::X3DNode
H3DUniquePtr< SFNode >	metadata
	Meta data about the node. More...

Public Attributes inherited from H3D::X3DBoundedObject
H3DUniquePtr< SFVec3f >	bboxCenter
	Specifies a the center of an axis-aligned bounding box enclosing the node. More...

H3DUniquePtr< SFVec3f >	bboxSize
	Specifies a the size of an axis-aligned bounding box enclosing the node. More...

Public Attributes inherited from H3D::H3DBoundedObject
H3DUniquePtr< SFBound >	bound
	The field containing the bound object. More...

Public Attributes inherited from H3D::H3DDisplayListObject
H3DUniquePtr< DisplayList >	displayList
	The DisplayList instance handling the OpenGL caching of this object.

Static Public Attributes
static H3DNodeDatabase	database
	The H3DNodeDatabase for this node.

Static Public Attributes inherited from H3D::MatrixTransform
static H3DNodeDatabase	database
	The H3DNodeDatabase for this node.

Static Public Attributes inherited from H3D::X3DGroupingNode
static H3DNodeDatabase	database
	The H3DNodeDatabase for this node.

Static Public Attributes inherited from H3D::X3DNode
static H3DNodeDatabase	database
	The H3DNodeDatabase for this node.

Additional Inherited Members
Public Types inherited from H3D::Node
typedef std::map< Node , Node >	DeepCopyMap
	A map type used during a deep copy clone() to map from original nodes to cloned nodes.

Static Public Member Functions inherited from H3D::Node
static unsigned int	nrNodesAlive ()
	Returns the nr of nodes currently alive, i.e. nodes created but not destructed.

static int	nrNodesCreated ()
	Returns the number of nodes created in total since the start of the program.

Protected Member Functions inherited from H3D::Node
void	cloneFieldValue (Field &_from, Field &_to, bool deepCopy, DeepCopyMap &deepCopyMap)
	A helper function for the clone() method. More...

Static Protected Member Functions inherited from H3D::Node
static Node *	getClonedInstance (Node *original, bool deepCopy, DeepCopyMap &deepCopyMap)
	A helper function for nodes that implement clone() More...

Protected Attributes inherited from H3D::X3DGroupingNode
bool	children_multi_pass_transparency
	Will be set in traverseSG to indicate if any of the children enables multi-pass transparency. More...

vector< H3DRenderStateObject * >	render_states
	A vector of all the H3DRenderStatesObject within this X3DGroupingNode.

vector< ClipPlane * >	clip_planes
	A vector of only ClipPlane children of this X3DGroupingNode.

Detailed Description

The LOD node specifies various levels of detail or complexity for a given object, and provides hints allowing browsers to automatically choose the appropriate version of the object based on the distance from the user.

The children field contains a list of nodes that represent the same object or objects at varying levels of detail, ordered from highest level of detail to the lowest level of detail.

The range field specifies the ideal distances at which to switch between the levels. The forceTransitions field specifies whether browsers are allowed to disregard level distances in order to provide better performance. A forceTransitions value of TRUE specifies that every transition should be performed regardless of any internal optimizations that might be available. A forceTransitions value of FALSE specifies that browsers are allowed to disregard level distances in order to provide better performance.

The center field is a translation offset in the local coordinate system that specifies the centre of the LOD node for distance calculations.

The number of nodes in the children field shall exceed the number of values in the range field by one (i.e., N+1 children nodes for N range values). The range field contains monotonic increasing values that shall be greater than zero. In order to calculate which level to display, first the distance is calculated from the viewer's location, transformed into the local coordinate system of the LOD node (including any scaling transformations), to the center point of the LOD node. Then, the LOD node evaluates the step function L(d) to choose a level for a given value of d (where d is the distance from the viewer position to the centre of the LOD node).

Examples:

LOD.x3d ( Source )

Member Function Documentation

◆ closestPoint()

void LOD::closestPoint	(	const Vec3f &	p,
		NodeIntersectResult &	result
	)

virtual

Find closest point on Node to p.

Calls closestPoint for the same child as the one that should be rendered.

Parameters

p	The point to find the closest point to.
result	A struct containing various results of closest points such as which geometries the closest points where detected on.

Reimplemented from H3D::MatrixTransform.

References H3D::X3DGroupingNode::children, H3D::Node::closestPoint(), and display_index.

◆ lineIntersect()

bool LOD::lineIntersect	(	const Vec3f &	from,
		const Vec3f &	to,
		LineIntersectResult &	result
	)

virtual

Detect intersection between a line segment and a Node.

Calls lineIntersect for the same child as the one that should be rendered.

Parameters

from	The start of the line segment.
to	The end of the line segment.
result	Contains info about the closest intersection for every object that intersects the line.

Returns: true if intersected, false otherwise.

Reimplemented from H3D::MatrixTransform.

References H3D::X3DGroupingNode::children, display_index, and H3D::Node::lineIntersect().

◆ movingSphereIntersect()

bool LOD::movingSphereIntersect	(	H3DFloat	radius,
		const Vec3f &	from,
		const Vec3f &	to,
		NodeIntersectResult &	result
	)

virtual

Detect collision between a moving sphere and the Node.

Calls movingSphereIntersect for the same child as the one that should be rendered.

Parameters

radius	The radius of the sphere
from	The start position of the sphere
to	The end position of the sphere.
result	A struct containing various results of intersections such as which geometries intersected the moving sphere.

Returns: true if intersected, false otherwise.

Reimplemented from H3D::MatrixTransform.

References H3D::X3DGroupingNode::children, display_index, and H3D::Node::movingSphereIntersect().

◆ traverseSG()

void LOD::traverseSG ( TraverseInfo & ti )

virtual

Traverse the scenegraph.

Calculates distance to viewer and decides which level in the LOD should be used for rendering.

Parameters

ti	The TraverseInfo object containing information about the traversal.

Reimplemented from H3D::MatrixTransform.

References H3D::X3DViewpointNode::accForwardMatrix, center, H3D::X3DGroupingNode::children, display_index, forceTransitions, H3D::TraverseInfo::getAccInverseMatrix(), H3D::X3DViewpointNode::getActive(), length(), range, and H3D::X3DViewpointNode::totalPosition.

Member Data Documentation

◆ center

H3DUniquePtr< SFVec3f > H3D::LOD::center

The center field is a translation offset in the local coordinate system that specifies the centre of the LOD node for distance calculations.

Default value: 0 0 0
Access type: inputOutput

Referenced by traverseSG().

◆ forceTransitions

H3DUniquePtr< SFBool > H3D::LOD::forceTransitions

The forceTransitions field specifies whether browsers are allowed to disregard level distances in order to provide better performance.

Default value: false
Access type: inputOutput

Referenced by LOD(), and traverseSG().

◆ level_changed

H3DUniquePtr< SFInt32 > H3D::LOD::level_changed

The LOD node generates a level_changed event with value i where the value of i identifies which level was activated for display.

Access type: outputOnly
Default value: SFInt32 = 0

◆ range

H3DUniquePtr< MFFloat > H3D::LOD::range

The range field specifies the ideal distances at which to switch between the levels.

Each value in the range field shall be greater than the previous value.

Access type: inputOutput

Referenced by traverseSG().

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

Public Member Functions

Public Attributes

Static Public Attributes

Additional Inherited Members

Detailed Description

Member Function Documentation

◆ closestPoint()

◆ lineIntersect()

◆ movingSphereIntersect()

◆ traverseSG()

Member Data Documentation

◆ center

◆ forceTransitions

◆ level_changed

◆ range