Level-of-detail management for multi-resolution terrains. More...
#include <Inventor/geo/SoGeoLOD.h>
Public Member Functions | |
virtual SoType | getTypeId () const |
Returns the type identifier for this specific instance. | |
SoGeoLOD () | |
Constructor. | |
SoGeoLOD (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 SoNode * | getChild (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 SoNode * | copy (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 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 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 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 | |
SoMFString | geoSystem |
Defines the spatial reference frame. | |
SoSFString | child1Url |
First child url : bottom-left quadtree child. | |
SoSFString | child2Url |
Second child url : up-left quadtree child. | |
SoSFString | child3Url |
Third child url : up-right quadtree child. | |
SoSFString | child4Url |
Fourth child url : bottom-right quadtree child. | |
SoSFString | rootUrl |
Url of the file that contains the root tile geometry. | |
SoSFFloat | range |
World-space distance to use as switching criteria. | |
SoSFVec3d | center |
Object-space center of the model. | |
Public Attributes inherited from SoGroup | |
SoSFBool | boundingBoxIgnoring |
Whether to ignore this node during bounding box traversal. | |
Level-of-detail management for multi-resolution terrains.
The SoGeoLOD node allows applications to build massive tiled, multi-resolution terrain models where the viewer progressively loads higher resolution detail as you fly into the terrain.
The SoGeoLOD node provides a terrain-specialized form of the LOD node. It is a grouping node that specifies two different levels of detail for an object using a tree structure, where 0 to 4 children can be specified, and also efficiently manages the loading and unloading of these levels of detail. The level of detail is switched depending upon whether the user is closer or further than range meters from the geospatial coordinate center. The center field should be specified as described in 25.2.4 Specifying geospatial coordinates. The geoSystem field is used to define the spatial reference frame and is described in 25.2.3 Specifying a spatial reference frame. When the user is outside the specified range, only the geometry for rootUrl or rootNode are displayed. When the viewer enters the specified range, this geometry is replaced with the contents of the four children files defined by child1Url through child4Url. The four children files are loaded into memory only when the user is within the specified range. Similarly, these are unloaded from memory when the user leaves this range. Figure below illustrates this process. The child URLs shall be arranged in the same order as in the figure; i.e., child1Url represents the bottom-left quadtree child. It is valid to specify less than four child URLs; in which case, the SoGeoLOD should switch to the children nodes when all of the specified URLs have been loaded. This latter feature can support tree structures other than quadtrees, such as binary trees.
The rootUrl and rootNode fields provide two different ways to specify the geometry of the root tile. You may use one or the other. The rootNode field lets you include the geometry for the root tile directly within the file; whereas the rootUrl field lets you specify a URL for a file that contains the geometry. The result of specifying a value for both of these fields is undefined.
center | 0 0 0 |
child1Url | [] |
child2Url | [] |
child3Url | [] |
child4Url | [] |
geoSystem | ["GD","WE"] |
range | 10 |
rootUrl | [] |
Definition at line 94 of file SoGeoLOD.h.
SoGeoLOD::SoGeoLOD | ( | ) |
Constructor.
SoGeoLOD::SoGeoLOD | ( | int | nChildren | ) |
Constructor that takes approximate number of children.
|
static |
Returns the type identifier for this class.
|
virtual |
Returns the type identifier for this specific instance.
Reimplemented from SoGroup.
SoSFVec3d SoGeoLOD::center |
Object-space center of the model.
Definition at line 151 of file SoGeoLOD.h.
SoSFString SoGeoLOD::child1Url |
First child url : bottom-left quadtree child.
Definition at line 121 of file SoGeoLOD.h.
SoSFString SoGeoLOD::child2Url |
Second child url : up-left quadtree child.
Definition at line 126 of file SoGeoLOD.h.
SoSFString SoGeoLOD::child3Url |
Third child url : up-right quadtree child.
Definition at line 131 of file SoGeoLOD.h.
SoSFString SoGeoLOD::child4Url |
Fourth child url : bottom-right quadtree child.
Definition at line 136 of file SoGeoLOD.h.
SoMFString SoGeoLOD::geoSystem |
Defines the spatial reference frame.
Valid values are:
Definition at line 116 of file SoGeoLOD.h.
SoSFFloat SoGeoLOD::range |
World-space distance to use as switching criteria.
Definition at line 146 of file SoGeoLOD.h.
SoSFString SoGeoLOD::rootUrl |
Url of the file that contains the root tile geometry.
Definition at line 141 of file SoGeoLOD.h.