Open Inventor Release 2024.1.3
 
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SoLevelOfSimplification Class Reference

VSG extension Level-of-detail switching node designed for grouping simplified versions of the same shape. More...

#include <Inventor/nodes/SoLevelOfSimplification.h>

+ Inheritance diagram for SoLevelOfSimplification:

Public Member Functions

virtual SoType getTypeId () const
 Returns the type identifier for this specific instance.
 
 SoLevelOfSimplification ()
 Creates level-of-simplification node with default settings.
 
 SoLevelOfSimplification (int nChildren)
 Constructor that takes approximate number of children.
 
- Public Member Functions inherited from SoLOD
 SoLOD ()
 Creates a distance-based level-of-detail node with default settings.
 
 SoLOD (int nChildren)
 Constructor that takes approximate number of children.
 
- Public Member Functions inherited from SoGroup
 SoGroup ()
 Creates an empty group node.
 
 SoGroup (int nChildren)
 Constructor that takes approximate number of children.
 
virtual void addChild (SoNode *child)
 Adds a child as last one in group.
 
virtual void insertChild (SoNode *child, int newChildIndex)
 Adds a child so that it becomes the one with the given index.
 
virtual SoNodegetChild (int index) const
 Returns pointer the child node with the given index.
 
virtual int findChild (const SoNode *child) const
 Finds index of given child within group.
 
virtual int getNumChildren () const
 Returns number of children.
 
virtual void removeChild (int index)
 Removes child with given index from group.
 
virtual void removeChild (SoNode *child)
 Removes first instance of given child from group.
 
virtual void removeAllChildren ()
 Removes all children from group.
 
virtual void replaceChild (int index, SoNode *newChild)
 Replaces child with given index with new child.
 
virtual void replaceChild (SoNode *oldChild, SoNode *newChild)
 Replaces first instance of given child with new child.
 
- 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 SoNodecopy (SbBool copyConnections=FALSE) const
 Creates and returns an exact copy of the node.
 
virtual SbBool affectsState () const
 Returns TRUE if a node has an effect on the state during traversal.
 
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 SoFieldgetField (const SbName &fieldName) const
 Returns a the field of this object whose name is fieldName.
 
virtual SoFieldgetEventIn (const SbName &fieldName) const
 Returns a the eventIn with the given name.
 
virtual SoFieldgetEventOut (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 SoLOD
static SoType getClassTypeId ()
 Returns the type identifier for this class.
 
- Static Public Member Functions inherited from SoGroup
static SoType getClassTypeId ()
 Returns the type identifier for this class.
 
- Static Public Member Functions inherited from SoNode
static SoType getClassTypeId ()
 Returns the type identifier for this class.
 
static SoNodegetByName (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

SoMFFloat percentages
 Percentage decimation for each child.
 
SoSFInt32 numTriangles
 Number of triangles in highest (1.0) case.
 
- Public Attributes inherited from SoLOD
SoMFFloat range
 World-space distances to use as switching criteria.
 
SoSFVec3f center
 Object-space center of the model.
 
- Public Attributes inherited from SoGroup
SoSFBool boundingBoxIgnoring
 Whether to ignore this node during bounding box traversal.
 

Detailed Description

VSG extension Level-of-detail switching node designed for grouping simplified versions of the same shape.

This group node is used to group the results of simplifying a shape, such that every child represents the same model but with a different number of primitives. Since it is derived from SoLOD, it can behave as a distance-based level-of-detail node; however, it also responds to the decimation percentage element. It records what percentage decimation each child is, and then chooses the appropriate child based on the DecimationPercentage and DecimationType elements.

You should specify N percentages for N+1 children. If the DecimationType is HIGHEST or LOWEST, then the LevelOfSimplification node will automatically choose the first or last child, respectively. If the DecimationType is PERCENTAGE, then the node will choose child "i" based on the decimation percentage element value such that:

   percentages[i-1] <= DecimationPercentage < percentages[i]

If the DecimationType is AUTOMATIC, then the child is chosen based on the range value in the usual SoLOD manner, but no child greater than the value of the DecimationPercentage element will be chosen.

This node also has a field for recording how many triangles the full detail child contains. This allows this node to answer an SoGetPrimitiveCountAction without traversing its children. This is a benefit when some children contain WWWInline , a common occurrence. If the children contain some non-triangle primitives, then the field should be -1 which will force the node to traverse its children during SoGetPrimitiveCountAction.

FILE FORMAT/DEFAULT

    LevelOfSimplification {
    percentages []
    numTriangles -1
    center 0 0 0
    range [ ]
    }

ACTION BEHAVIOR

SEE ALSO

SoGetPrimitiveCountAction, SoLOD, SoOctreeOrdering, SoRenderList, SoValueOrdering SoLevelOfDetail

Definition at line 140 of file SoLevelOfSimplification.h.

Constructor & Destructor Documentation

◆ SoLevelOfSimplification() [1/2]

SoLevelOfSimplification::SoLevelOfSimplification ( )

Creates level-of-simplification node with default settings.

◆ SoLevelOfSimplification() [2/2]

SoLevelOfSimplification::SoLevelOfSimplification ( int  nChildren)

Constructor that takes approximate number of children.

Member Function Documentation

◆ getClassTypeId()

static SoType SoLevelOfSimplification::getClassTypeId ( )
static

Returns the type identifier for this class.


◆ getTypeId()

virtual SoType SoLevelOfSimplification::getTypeId ( ) const
virtual

Returns the type identifier for this specific instance.

Reimplemented from SoLOD.

Member Data Documentation

◆ numTriangles

SoSFInt32 SoLevelOfSimplification::numTriangles

Number of triangles in highest (1.0) case.

Can be -1 if unknown or if children contain primitives other than triangles.

Definition at line 157 of file SoLevelOfSimplification.h.

◆ percentages

SoMFFloat SoLevelOfSimplification::percentages

Percentage decimation for each child.

Should be numbers between 0.0 and 1.0, with 1.0 representing full detail and 0.0 representing bounding box detail.

Definition at line 151 of file SoLevelOfSimplification.h.


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