javax.media.j3d
Class BranchGroup

java.lang.Object
  javax.media.j3d.SceneGraphObject
      javax.media.j3d.Node
          javax.media.j3d.Group
              javax.media.j3d.BranchGroup

Direct Known Subclasses:

PlatformGeometry, ViewerAvatar, ViewingPlatform

public class BranchGroup
extends Group

The BranchGroup serves as a pointer to the root of a scene graph branch; BranchGroup objects are the only objects that can be inserted into a Locale's set of objects. A subgraph, rooted by a BranchGroup node can be thought of as a compile unit. The following things may be done with BranchGroup:

• A BranchGroup may be compiled by calling its compile method. This causes the entire subgraph to be compiled. If any BranchGroup nodes are contained within the subgraph, they are compiled as well (along with their descendants).
• A BranchGroup may be inserted into a virtual universe by attaching it to a Locale. The entire subgraph is then said to be live.
• A BranchGroup that is contained within another subgraph may be reparented or detached at run time if the appropriate capabilities are set.

Note that that if a BranchGroup is included in another subgraph, as a child of some other group node, it may not be attached to a Locale.

Field Summary

static int

ALLOW_DETACH For BranchGroup nodes, specifies that this BranchGroup allows detaching from its parent.

Fields inherited from class javax.media.j3d.Group

ALLOW_CHILDREN_EXTEND, ALLOW_CHILDREN_READ, ALLOW_CHILDREN_WRITE, ALLOW_COLLISION_BOUNDS_READ, ALLOW_COLLISION_BOUNDS_WRITE

Fields inherited from class javax.media.j3d.Node

ALLOW_AUTO_COMPUTE_BOUNDS_READ, ALLOW_AUTO_COMPUTE_BOUNDS_WRITE, ALLOW_BOUNDS_READ, ALLOW_BOUNDS_WRITE, ALLOW_COLLIDABLE_READ, ALLOW_COLLIDABLE_WRITE, ALLOW_LOCAL_TO_VWORLD_READ, ALLOW_LOCALE_READ, ALLOW_PARENT_READ, ALLOW_PICKABLE_READ, ALLOW_PICKABLE_WRITE, ENABLE_COLLISION_REPORTING, ENABLE_PICK_REPORTING

Constructor Summary

BranchGroup()
Constructs and initializes a new BranchGroup node object.

Method Summary

Node	cloneNode(boolean forceDuplicate) Creates a new instance of the node.
void	compile() Compiles the source BranchGroup associated with this object and creates and caches a compiled scene graph.
void	detach() Detaches this BranchGroup from its parent.
PickInfo[]	pickAll(int mode, int flags, PickShape pickShape) Returns an array unsorted references to all the PickInfo objects that are pickable below this BranchGroup that intersect with PickShape.
SceneGraphPath[]	pickAll(PickShape pickShape) Returns an array referencing all the items that are pickable below this BranchGroup that intersect with PickShape.
PickInfo[]	pickAllSorted(int mode, int flags, PickShape pickShape) Returns a sorted array of PickInfo references to all the pickable items that intersect with the pickShape.
SceneGraphPath[]	pickAllSorted(PickShape pickShape) Returns a sorted array of references to all the Pickable items that intersect with the pickShape.
PickInfo	pickAny(int mode, int flags, PickShape pickShape) Returns a PickInfo which references the pickable item below this BranchGroup that intersects with pickShape.
SceneGraphPath	pickAny(PickShape pickShape) Returns a reference to any item that is Pickable below this BranchGroup that intersects with pickShape.
PickInfo	pickClosest(int mode, int flags, PickShape pickShape) Returns a PickInfo which references the pickable item which is closest to the origin of pickShape.
SceneGraphPath	pickClosest(PickShape pickShape) Returns a SceneGraphPath that references the pickable item closest to the origin of pickShape.

Methods inherited from class javax.media.j3d.Group

addChild, getAllChildren, getAlternateCollisionTarget, getChild, getCollisionBounds, indexOfChild, insertChild, moveTo, numChildren, removeAllChildren, removeChild, removeChild, setAlternateCollisionTarget, setChild, setCollisionBounds

Methods inherited from class javax.media.j3d.Node

cloneTree, cloneTree, cloneTree, cloneTree, cloneTree, cloneTree, duplicateNode, getBounds, getBoundsAutoCompute, getCollidable, getLocale, getLocalToVworld, getLocalToVworld, getParent, getPickable, setBounds, setBoundsAutoCompute, setCollidable, setPickable

Methods inherited from class javax.media.j3d.SceneGraphObject

clearCapability, clearCapabilityIsFrequent, getCapability, getCapabilityIsFrequent, getName, getUserData, isCompiled, isLive, setCapability, setCapabilityIsFrequent, setName, setUserData, toString, updateNodeReferences

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, wait, wait, wait

Field Detail

ALLOW_DETACH

public static final int ALLOW_DETACH

For BranchGroup nodes, specifies that this BranchGroup allows detaching from its parent.

See Also:

Constant Field Values

Constructor Detail

BranchGroup

public BranchGroup()

Constructs and initializes a new BranchGroup node object.

Method Detail

compile

public void compile()

Compiles the source BranchGroup associated with this object and creates and caches a compiled scene graph.

Throws:

SceneGraphCycleException - if there is a cycle in the scene graph

RestrictedAccessException - if the method is called when this object is part of a live scene graph.

detach

public void detach()

Detaches this BranchGroup from its parent.

pickAll

public SceneGraphPath[] pickAll(PickShape pickShape)

Returns an array referencing all the items that are pickable below this BranchGroup that intersect with PickShape. The resultant array is unordered.

Parameters:

pickShape - the PickShape object

Throws:

java.lang.IllegalStateException - if BranchGroup is not live.

See Also:

SceneGraphPath, Locale.pickAll(javax.media.j3d.PickShape), PickShape

pickAll

public PickInfo[] pickAll(int mode,
                          int flags,
                          PickShape pickShape)

Returns an array unsorted references to all the PickInfo objects that are pickable below this BranchGroup that intersect with PickShape. The accuracy of the pick is set by the pick mode. The mode include : PickInfo.PICK_BOUNDS and PickInfo.PICK_GEOMETRY. The amount of information returned is specified via a masked variable, flags, indicating which components are present in each returned PickInfo object.

Parameters:

mode - picking mode, one of PickInfo.PICK_BOUNDS or PickInfo.PICK_GEOMETRY.

flags - a mask indicating which components are present in each PickInfo object. This is specified as one or more individual bits that are bitwise "OR"ed together to describe the PickInfo data. The flags include :

PickInfo.SCENEGRAPHPATH - request for computed SceneGraphPath.
PickInfo.NODE - request for computed intersected Node.
PickInfo.LOCAL_TO_VWORLD - request for computed local to virtual world transform.
PickInfo.CLOSEST_INTERSECTION_POINT - request for closest intersection point.
PickInfo.CLOSEST_DISTANCE - request for the distance of closest intersection.
PickInfo.CLOSEST_GEOM_INFO - request for only the closest intersection geometry information.
PickInfo.ALL_GEOM_INFO - request for all intersection geometry information.

pickShape - the description of this picking volume or area.

Throws:

java.lang.IllegalArgumentException - if flags contains both CLOSEST_GEOM_INFO and ALL_GEOM_INFO.

java.lang.IllegalArgumentException - if pickShape is a PickPoint and pick mode is set to PICK_GEOMETRY.

java.lang.IllegalArgumentException - if pick mode is neither PICK_BOUNDS nor PICK_GEOMETRY.

java.lang.IllegalArgumentException - if pick mode is PICK_BOUNDS and flags includes any of CLOSEST_INTERSECTION_POINT, CLOSEST_DISTANCE, CLOSEST_GEOM_INFO or ALL_GEOM_INFO.

java.lang.IllegalArgumentException - if pickShape is PickBounds and flags includes any of CLOSEST_INTERSECTION_POINT, CLOSEST_DISTANCE, CLOSEST_GEOM_INFO or ALL_GEOM_INFO.

java.lang.IllegalStateException - if BranchGroup is not live.

CapabilityNotSetException - if the mode is PICK_GEOMETRY and the Geometry.ALLOW_INTERSECT capability bit is not set in any Geometry objects referred to by any shape node whose bounds intersects the PickShape.

CapabilityNotSetException - if flags contains any of CLOSEST_INTERSECTION_POINT, CLOSEST_DISTANCE, CLOSEST_GEOM_INFO or ALL_GEOM_INFO, and the capability bits that control reading of coordinate data are not set in any GeometryArray object referred to by any shape node that intersects the PickShape. The capability bits that must be set to avoid this exception are as follows :

• By-copy geometry : GeometryArray.ALLOW_COORDINATE_READ
• By-reference geometry : GeometryArray.ALLOW_REF_DATA_READ
• Indexed geometry : IndexedGeometryArray.ALLOW_COORDINATE_INDEX_READ (in addition to one of the above)

Since:

Java 3D 1.4

See Also:

Locale.pickAll(int,int,javax.media.j3d.PickShape), PickInfo

pickAllSorted

public SceneGraphPath[] pickAllSorted(PickShape pickShape)

Returns a sorted array of references to all the Pickable items that intersect with the pickShape. Element [0] references the item closest to origin of PickShape successive array elements are further from the origin Note: If pickShape is of type PickBounds, the resulting array is unordered.

Parameters:

pickShape - the PickShape object

Throws:

java.lang.IllegalStateException - if BranchGroup is not live.

See Also:

SceneGraphPath, Locale.pickAllSorted(javax.media.j3d.PickShape), PickShape

pickAllSorted

public PickInfo[] pickAllSorted(int mode,
                                int flags,
                                PickShape pickShape)

Returns a sorted array of PickInfo references to all the pickable items that intersect with the pickShape. Element [0] references the item closest to origin of PickShape successive array elements are further from the origin The accuracy of the pick is set by the pick mode. The mode include : PickInfo.PICK_BOUNDS and PickInfo.PICK_GEOMETRY. The amount of information returned is specified via a masked variable, flags, indicating which components are present in each returned PickInfo object.

Parameters:

mode - picking mode, one of PickInfo.PICK_BOUNDS or PickInfo.PICK_GEOMETRY.

flags - a mask indicating which components are present in each PickInfo object. This is specified as one or more individual bits that are bitwise "OR"ed together to describe the PickInfo data. The flags include :

PickInfo.SCENEGRAPHPATH - request for computed SceneGraphPath.
PickInfo.NODE - request for computed intersected Node.
PickInfo.LOCAL_TO_VWORLD - request for computed local to virtual world transform.
PickInfo.CLOSEST_INTERSECTION_POINT - request for closest intersection point.
PickInfo.CLOSEST_DISTANCE - request for the distance of closest intersection.
PickInfo.CLOSEST_GEOM_INFO - request for only the closest intersection geometry information.
PickInfo.ALL_GEOM_INFO - request for all intersection geometry information.

pickShape - the description of this picking volume or area.

Throws:

java.lang.IllegalArgumentException - if flags contains both CLOSEST_GEOM_INFO and ALL_GEOM_INFO.

java.lang.IllegalArgumentException - if pickShape is a PickPoint and pick mode is set to PICK_GEOMETRY.

java.lang.IllegalArgumentException - if pick mode is neither PICK_BOUNDS nor PICK_GEOMETRY.

java.lang.IllegalArgumentException - if pick mode is PICK_BOUNDS and flags includes any of CLOSEST_INTERSECTION_POINT, CLOSEST_DISTANCE, CLOSEST_GEOM_INFO or ALL_GEOM_INFO.

java.lang.IllegalArgumentException - if pickShape is PickBounds and flags includes any of CLOSEST_INTERSECTION_POINT, CLOSEST_DISTANCE, CLOSEST_GEOM_INFO or ALL_GEOM_INFO.

java.lang.IllegalStateException - if BranchGroup is not live.

CapabilityNotSetException - if the mode is PICK_GEOMETRY and the Geometry.ALLOW_INTERSECT capability bit is not set in any Geometry objects referred to by any shape node whose bounds intersects the PickShape.

CapabilityNotSetException - if flags contains any of CLOSEST_INTERSECTION_POINT, CLOSEST_DISTANCE, CLOSEST_GEOM_INFO or ALL_GEOM_INFO, and the capability bits that control reading of coordinate data are not set in any GeometryArray object referred to by any shape node that intersects the PickShape. The capability bits that must be set to avoid this exception are as follows :

• By-copy geometry : GeometryArray.ALLOW_COORDINATE_READ
• By-reference geometry : GeometryArray.ALLOW_REF_DATA_READ
• Indexed geometry : IndexedGeometryArray.ALLOW_COORDINATE_INDEX_READ (in addition to one of the above)

Since:

Java 3D 1.4

See Also:

Locale.pickAllSorted(int,int,javax.media.j3d.PickShape), PickInfo

pickClosest

public SceneGraphPath pickClosest(PickShape pickShape)

Returns a SceneGraphPath that references the pickable item closest to the origin of pickShape. Note: If pickShape is of type PickBounds, the return is any pickable node below this BranchGroup.

Parameters:

pickShape - the PickShape object

Throws:

java.lang.IllegalStateException - if BranchGroup is not live.

See Also:

SceneGraphPath, Locale.pickClosest(javax.media.j3d.PickShape), PickShape

pickClosest

public PickInfo pickClosest(int mode,
                            int flags,
                            PickShape pickShape)

Returns a PickInfo which references the pickable item which is closest to the origin of pickShape. The accuracy of the pick is set by the pick mode. The mode include : PickInfo.PICK_BOUNDS and PickInfo.PICK_GEOMETRY. The amount of information returned is specified via a masked variable, flags, indicating which components are present in each returned PickInfo object.

Parameters:

mode - picking mode, one of PickInfo.PICK_BOUNDS or PickInfo.PICK_GEOMETRY.

flags - a mask indicating which components are present in each PickInfo object. This is specified as one or more individual bits that are bitwise "OR"ed together to describe the PickInfo data. The flags include :

PickInfo.SCENEGRAPHPATH - request for computed SceneGraphPath.
PickInfo.NODE - request for computed intersected Node.
PickInfo.LOCAL_TO_VWORLD - request for computed local to virtual world transform.
PickInfo.CLOSEST_INTERSECTION_POINT - request for closest intersection point.
PickInfo.CLOSEST_DISTANCE - request for the distance of closest intersection.
PickInfo.CLOSEST_GEOM_INFO - request for only the closest intersection geometry information.
PickInfo.ALL_GEOM_INFO - request for all intersection geometry information.

pickShape - the description of this picking volume or area.

Throws:

java.lang.IllegalArgumentException - if flags contains both CLOSEST_GEOM_INFO and ALL_GEOM_INFO.

java.lang.IllegalArgumentException - if pickShape is a PickPoint and pick mode is set to PICK_GEOMETRY.

java.lang.IllegalArgumentException - if pick mode is neither PICK_BOUNDS nor PICK_GEOMETRY.

java.lang.IllegalArgumentException - if pick mode is PICK_BOUNDS and flags includes any of CLOSEST_INTERSECTION_POINT, CLOSEST_DISTANCE, CLOSEST_GEOM_INFO or ALL_GEOM_INFO.

java.lang.IllegalArgumentException - if pickShape is PickBounds and flags includes any of CLOSEST_INTERSECTION_POINT, CLOSEST_DISTANCE, CLOSEST_GEOM_INFO or ALL_GEOM_INFO.

java.lang.IllegalStateException - if BranchGroup is not live.

CapabilityNotSetException - if the mode is PICK_GEOMETRY and the Geometry.ALLOW_INTERSECT capability bit is not set in any Geometry objects referred to by any shape node whose bounds intersects the PickShape.

CapabilityNotSetException - if flags contains any of CLOSEST_INTERSECTION_POINT, CLOSEST_DISTANCE, CLOSEST_GEOM_INFO or ALL_GEOM_INFO, and the capability bits that control reading of coordinate data are not set in any GeometryArray object referred to by any shape node that intersects the PickShape. The capability bits that must be set to avoid this exception are as follows :

• By-copy geometry : GeometryArray.ALLOW_COORDINATE_READ
• By-reference geometry : GeometryArray.ALLOW_REF_DATA_READ
• Indexed geometry : IndexedGeometryArray.ALLOW_COORDINATE_INDEX_READ (in addition to one of the above)

Since:

Java 3D 1.4

See Also:

Locale.pickClosest(int,int,javax.media.j3d.PickShape), PickInfo

pickAny

public SceneGraphPath pickAny(PickShape pickShape)

Returns a reference to any item that is Pickable below this BranchGroup that intersects with pickShape.

Parameters:

pickShape - the PickShape object

Throws:

java.lang.IllegalStateException - if BranchGroup is not live.

See Also:

SceneGraphPath, Locale.pickAny(javax.media.j3d.PickShape), PickShape

pickAny

public PickInfo pickAny(int mode,
                        int flags,
                        PickShape pickShape)

Returns a PickInfo which references the pickable item below this BranchGroup that intersects with pickShape. The accuracy of the pick is set by the pick mode. The mode include : PickInfo.PICK_BOUNDS and PickInfo.PICK_GEOMETRY. The amount of information returned is specified via a masked variable, flags, indicating which components are present in each returned PickInfo object.

Parameters:

mode - picking mode, one of PickInfo.PICK_BOUNDS or PickInfo.PICK_GEOMETRY.

flags - a mask indicating which components are present in each PickInfo object. This is specified as one or more individual bits that are bitwise "OR"ed together to describe the PickInfo data. The flags include :

PickInfo.SCENEGRAPHPATH - request for computed SceneGraphPath.
PickInfo.NODE - request for computed intersected Node.
PickInfo.LOCAL_TO_VWORLD - request for computed local to virtual world transform.
PickInfo.CLOSEST_INTERSECTION_POINT - request for closest intersection point.
PickInfo.CLOSEST_DISTANCE - request for the distance of closest intersection.
PickInfo.CLOSEST_GEOM_INFO - request for only the closest intersection geometry information.
PickInfo.ALL_GEOM_INFO - request for all intersection geometry information.

pickShape - the description of this picking volume or area.

Throws:

java.lang.IllegalArgumentException - if flags contains both CLOSEST_GEOM_INFO and ALL_GEOM_INFO.

java.lang.IllegalArgumentException - if pickShape is a PickPoint and pick mode is set to PICK_GEOMETRY.

java.lang.IllegalArgumentException - if pick mode is neither PICK_BOUNDS nor PICK_GEOMETRY.

java.lang.IllegalArgumentException - if pick mode is PICK_BOUNDS and flags includes any of CLOSEST_INTERSECTION_POINT, CLOSEST_DISTANCE, CLOSEST_GEOM_INFO or ALL_GEOM_INFO.

java.lang.IllegalArgumentException - if pickShape is PickBounds and flags includes any of CLOSEST_INTERSECTION_POINT, CLOSEST_DISTANCE, CLOSEST_GEOM_INFO or ALL_GEOM_INFO.

java.lang.IllegalStateException - if BranchGroup is not live.

CapabilityNotSetException - if the mode is PICK_GEOMETRY and the Geometry.ALLOW_INTERSECT capability bit is not set in any Geometry objects referred to by any shape node whose bounds intersects the PickShape.

CapabilityNotSetException - if flags contains any of CLOSEST_INTERSECTION_POINT, CLOSEST_DISTANCE, CLOSEST_GEOM_INFO or ALL_GEOM_INFO, and the capability bits that control reading of coordinate data are not set in any GeometryArray object referred to by any shape node that intersects the PickShape. The capability bits that must be set to avoid this exception are as follows :

• By-copy geometry : GeometryArray.ALLOW_COORDINATE_READ
• By-reference geometry : GeometryArray.ALLOW_REF_DATA_READ
• Indexed geometry : IndexedGeometryArray.ALLOW_COORDINATE_INDEX_READ (in addition to one of the above)

Since:

Java 3D 1.4

See Also:

Locale.pickAny(int,int,javax.media.j3d.PickShape), PickInfo

cloneNode

public Node cloneNode(boolean forceDuplicate)

Creates a new instance of the node. This routine is called by cloneTree to duplicate the current node.

Overrides:

cloneNode in class Group

Parameters:

forceDuplicate - when set to true, causes the duplicateOnCloneTree flag to be ignored. When false, the value of each node's duplicateOnCloneTree variable determines whether NodeComponent data is duplicated or copied.

See Also:

Node.cloneTree(), Node.cloneNode(boolean), Node.duplicateNode(javax.media.j3d.Node, boolean), NodeComponent.setDuplicateOnCloneTree(boolean)