class SG_EXPORT osg::LOD

LOD - Level Of Detail group node which allows switching between children depending on distance from eye point.

Inheritance:

Public Methods

LOD()

LOD(const LOD&, const CopyOp& copyop=CopyOp::SHALLOW_COPY)

Copy constructor using CopyOp to manage deep vs shallow copy

META_Node(LOD)

virtual void traverse(NodeVisitor& nv)

void setRange(const unsigned int index, const float range)

Sets the value of range list element index to range which is a floating point distance specified in world coordinates.

inline const float getRange(const unsigned int index) const

returns the range for specified index

inline const unsigned int getNumRanges() const

returns the number of ranges currently set

inline void setCenter(const Vec3 &center)

Sets the object-space point which defines the center of the osg::LOD.

inline const Vec3& getCenter() const

return the LOD center point.

void setEvaluateLODCallback(EvaluateLODCallback* cbc)

Set the EvaluateLODCallback which allows users to attach customize computation of the the selection of LOD children

EvaluateLODCallback* getEvaluateLODCallback()

Get the non const ComputeBillboardCallback

const EvaluateLODCallback* getEvaluateLODCallback() const

Get the const ComputeBillboardCallback

inline const int evaluate(const Vec3& eye_local, const float bias=1.0f) const

return the child to traverse.

virtual const int evaluateLODChild(const Vec3& eye_local, const float bias) const

Public Members

struct EvaluateLODCallback: public osg::Referenced

Callback attached to an LOD which allows the users to customize the selection of LOD children

Protected Fields

RangeList _rangeList2

ref_ptr<EvaluateLODCallback> _evaluateLODCallback

Vec3 _center

Protected Methods

virtual ~LOD()

Protected Members

typedef std::vector<float> RangeList RangeList _rangeList

Inherited from Group:

Public Methods

virtual bool addChild( Node* child )

virtual bool removeChild( Node* child )

virtual bool replaceChild( Node* origChild, Node* newChild )

inline const unsigned int getNumChildren() const

inline Node* getChild( const unsigned int i )

inline const Node* getChild( const unsigned int i ) const

inline bool containsNode( const Node* node ) const

inline ChildList::iterator findNode( const Node* node )

inline ChildList::const_iterator findNode( const Node* node ) const

Protected Fields

ChildList _children

Protected Methods

virtual const bool computeBound() const

Documentation

LOD - Level Of Detail group node which allows switching between children depending on distance from eye point. Typical uses are for load balancing - objects further away from the eye point are rendered at a lower level of detail, and at times of high stress on the graphics pipeline lower levels of detail can also be chosen. The children are ordered from most detailed (for close up views) to the least (see from a distance), and a set of ranges are used to decide which LOD is used at different view distances, the criteria used is child 'i' is used when range[i]

LOD()

LOD(const LOD&, const CopyOp& copyop=CopyOp::SHALLOW_COPY)

Copy constructor using CopyOp to manage deep vs shallow copy

META_Node(LOD)

virtual void traverse(NodeVisitor& nv)

void setRange(const unsigned int index, const float range)

Sets the value of range list element index to range which is a floating point distance specified in world coordinates. Range list automatically expands to accommodate values beyond the current getNumRanges().

inline const float getRange(const unsigned int index) const

returns the range for specified index

inline const unsigned int getNumRanges() const

returns the number of ranges currently set

inline void setCenter(const Vec3 &center)

Sets the object-space point which defines the center of the osg::LOD. center is affected by any transforms in the hierarchy above the osg::LOD.

inline const Vec3& getCenter() const

return the LOD center point.

struct EvaluateLODCallback: public osg::Referenced

Callback attached to an LOD which allows the users to customize the selection of LOD children

virtual const int evaluateLODChild(const osg::LOD* lod, const Vec3& eye_local, const float bias) const = 0

Compute the child to select

void setEvaluateLODCallback(EvaluateLODCallback* cbc)

Set the EvaluateLODCallback which allows users to attach customize computation of the the selection of LOD children

EvaluateLODCallback* getEvaluateLODCallback()

Get the non const ComputeBillboardCallback

const EvaluateLODCallback* getEvaluateLODCallback() const

Get the const ComputeBillboardCallback

inline const int evaluate(const Vec3& eye_local, const float bias=1.0f) const

return the child to traverse. Selected by the distance between the eye point in local coordinates and the LOD center, multiplied by the bias.

virtual const int evaluateLODChild(const Vec3& eye_local, const float bias) const

virtual ~LOD()

typedef std::vector<float> RangeList RangeList _rangeList

RangeList _rangeList2

ref_ptr<EvaluateLODCallback> _evaluateLODCallback

Vec3 _center

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