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javax.media.j3d
Class Node

java.lang.Object
  |
  +--javax.media.j3d.SceneGraphObject
        |
        +--javax.media.j3d.Node
Direct Known Subclasses:
Group, Leaf
public abstract class Node
extends SceneGraphObject

The Node class provides an abstract class for all Group and Leaf Nodes. It provides a common framework for constructing a Java 3D scene graph, specifically bounding volumes.

NOTE: Applications should not extend this class directly.

Field Summary
static int ALLOW_AUTO_COMPUTE_BOUNDS_READ
          Specifies that this Node allows read access to its bounds auto compute information.
static int ALLOW_AUTO_COMPUTE_BOUNDS_WRITE
          Specifies that this Node allows write access to its bounds auto compute information.
static int ALLOW_BOUNDS_READ
          Specifies that this Node allows read access to its bounds information.
static int ALLOW_BOUNDS_WRITE
          Specifies that this Node allows write access to its bounds information.
static int ALLOW_COLLIDABLE_READ
          Specifies that this Node allows reading its collidability state.
static int ALLOW_COLLIDABLE_WRITE
          Specifies that this Node allows write access its collidability state.
static int ALLOW_LOCAL_TO_VWORLD_READ
          Specifies that this Node allows read access to its local coordinates to virtual world (Vworld) coordinates transform.
static int ALLOW_PICKABLE_READ
          Specifies that this Node allows reading its pickability state.
static int ALLOW_PICKABLE_WRITE
          Specifies that this Node allows write access its pickability state.
static int ENABLE_COLLISION_REPORTING
          Specifies that this Node will be reported in the collision SceneGraphPath if a collision occurs.
static int ENABLE_PICK_REPORTING
          Specifies that this Node will be reported in the pick SceneGraphPath if a pick occurs.
 
Constructor Summary
Node()
          Constructs a Node object with default parameters.
 
Method Summary
 Node cloneNode(boolean forceDuplicate)
          Used to create a new instance of the node.
 Node cloneTree()
          Duplicates all the nodes of the specified sub-graph.
 Node cloneTree(boolean forceDuplicate)
          Duplicates all the nodes of the specified sub-graph.
 Node cloneTree(boolean forceDuplicate, boolean allowDanglingReference)
          Duplicates all the nodes of the specified sub-graph.
 Node cloneTree(NodeReferenceTable referenceTable)
          Duplicates all the nodes of the specified sub-graph.
 Node cloneTree(NodeReferenceTable referenceTable, boolean forceDuplicate)
          Duplicates all the nodes of the specified sub-graph.
 Node cloneTree(NodeReferenceTable referenceTable, boolean forceDuplicate, boolean allowDanglingReferences)
          Duplicates all the nodes of the specified sub-graph.
 void duplicateNode(Node originalNode, boolean forceDuplicate)
          Copies all node information from originalNode into the current node.
 Bounds getBounds()
          Returns the bounding object of a node.
 boolean getBoundsAutoCompute()
          Gets the value indicating if the automatic calcuation of geometric bounds of a node is on/off.
 boolean getCollidable()
          Returns the collidable value; this value determines whether this node and it's children, if a group node, can be considered for collision purposes; if it is set to false, then neither this node nor any children nodes will be traversed for collision purposes; the default value is true.
 void getLocalToVworld(SceneGraphPath path, Transform3D t)
          Retrieves the local coordinates to virtual world coordinates transform for the particular path in the scene graph ending with this node.
 void getLocalToVworld(Transform3D t)
          Retrieves the local coordinates to virtual world coordinates transform for this node in the scene graph.
 Node getParent()
          Retrieves the parent of this Node.
 boolean getPickable()
          Returns true if this Node is pickable, false if it is not pickable.
 void setBounds(Bounds bounds)
          Sets the geometric bounds of a node.
 void setBoundsAutoCompute(boolean autoCompute)
          Turns the automatic calcuation of geometric bounds of a node on/off.
 void setCollidable(boolean collidable)
          Sets the collidable value; determines whether this node and any of its children, if a group node, can be considered for collision purposes.
 void setPickable(boolean pickable)
          When set to true this Node can be Picked.
 
Methods inherited from class javax.media.j3d.SceneGraphObject
clearCapability, clearCapabilityIsFrequent, duplicateSceneGraphObject, getCapability, getCapabilityIsFrequent, getUserData, isCompiled, isLive, setCapability, setCapabilityIsFrequent, setUserData, updateNodeReferences
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Field Detail

ENABLE_PICK_REPORTING

public static final int ENABLE_PICK_REPORTING
Specifies that this Node will be reported in the pick SceneGraphPath if a pick occurs. This capability is only specifiable for Group nodes; it is ignored for leaf nodes. The default for Group nodes is false. All interior nodes not needed for uniqueness in a SceneGraphPath that don't have ENABLE_PICK_REPORTING set to true will not be reported in the SceneGraphPath.

See Also:
SceneGraphPath, Constant Field Values

ENABLE_COLLISION_REPORTING

public static final int ENABLE_COLLISION_REPORTING
Specifies that this Node will be reported in the collision SceneGraphPath if a collision occurs. This capability is only specifiable for Group nodes; it is ignored for leaf nodes. The default for Group nodes is false. All interior nodes not needed for uniqueness in a SceneGraphPath that don't have ENABLE_COLLISION_REPORTING set to true will not be reported in the SceneGraphPath.

See Also:
SceneGraphPath, Constant Field Values

ALLOW_BOUNDS_READ

public static final int ALLOW_BOUNDS_READ
Specifies that this Node allows read access to its bounds information.

See Also:
Constant Field Values

ALLOW_BOUNDS_WRITE

public static final int ALLOW_BOUNDS_WRITE
Specifies that this Node allows write access to its bounds information.

See Also:
Constant Field Values

ALLOW_PICKABLE_READ

public static final int ALLOW_PICKABLE_READ
Specifies that this Node allows reading its pickability state.

See Also:
Constant Field Values

ALLOW_PICKABLE_WRITE

public static final int ALLOW_PICKABLE_WRITE
Specifies that this Node allows write access its pickability state.

See Also:
Constant Field Values

ALLOW_COLLIDABLE_READ

public static final int ALLOW_COLLIDABLE_READ
Specifies that this Node allows reading its collidability state.

See Also:
Constant Field Values

ALLOW_COLLIDABLE_WRITE

public static final int ALLOW_COLLIDABLE_WRITE
Specifies that this Node allows write access its collidability state.

See Also:
Constant Field Values

ALLOW_AUTO_COMPUTE_BOUNDS_READ

public static final int ALLOW_AUTO_COMPUTE_BOUNDS_READ
Specifies that this Node allows read access to its bounds auto compute information.

See Also:
Constant Field Values

ALLOW_AUTO_COMPUTE_BOUNDS_WRITE

public static final int ALLOW_AUTO_COMPUTE_BOUNDS_WRITE
Specifies that this Node allows write access to its bounds auto compute information.

See Also:
Constant Field Values

ALLOW_LOCAL_TO_VWORLD_READ

public static final int ALLOW_LOCAL_TO_VWORLD_READ
Specifies that this Node allows read access to its local coordinates to virtual world (Vworld) coordinates transform.

See Also:
Constant Field Values
Constructor Detail

Node

public Node()
Constructs a Node object with default parameters. The default values are as follows:

Method Detail

getParent

public Node getParent()
Retrieves the parent of this Node. This method is only valid during the construction of the scene graph.

Returns:
the parent of this node, or null if this node has no parent
Throws:
RestrictedAccessException - if this object is part of live or compiled scene graph

setBounds

public void setBounds(Bounds bounds)
Sets the geometric bounds of a node.

Parameters:
bounds - the bounding object for a node
Throws:
CapabilityNotSetException - if appropriate capability is not set and this object is part of live or compiled scene graph

getBounds

public Bounds getBounds()
Returns the bounding object of a node.

Returns:
the node's bounding object
Throws:
CapabilityNotSetException - if appropriate capability is not set and this object is part of live or compiled scene graph
SceneGraphCycleException - if there is a cycle in the scene graph

getCollidable

public boolean getCollidable()
Returns the collidable value; this value determines whether this node and it's children, if a group node, can be considered for collision purposes; if it is set to false, then neither this node nor any children nodes will be traversed for collision purposes; the default value is true. The collidable setting is the way that an application can perform collision culling.

Returns:
the present collidable value for this node

setCollidable

public void setCollidable(boolean collidable)
Sets the collidable value; determines whether this node and any of its children, if a group node, can be considered for collision purposes.

Parameters:
collidable - the new collidable value for this node

setBoundsAutoCompute

public void setBoundsAutoCompute(boolean autoCompute)
Turns the automatic calcuation of geometric bounds of a node on/off.

Parameters:
autoCompute - indicates if the node's bounding object is automatically computed.
Throws:
CapabilityNotSetException - if appropriate capability is not set and this object is part of live or compiled scene graph

getBoundsAutoCompute

public boolean getBoundsAutoCompute()
Gets the value indicating if the automatic calcuation of geometric bounds of a node is on/off.

Returns:
the node's auto compute flag for the geometric bounding object
Throws:
CapabilityNotSetException - if appropriate capability is not set and this object is part of live or compiled scene graph

getLocalToVworld

public void getLocalToVworld(Transform3D t)
Retrieves the local coordinates to virtual world coordinates transform for this node in the scene graph. This is the composite of all transforms in the scene graph from the root down to this node. It is only valid for nodes that are part of a live scene graph.

Parameters:
t - the object that will receive the local coordinates to Vworld coordinates transform.
Throws:
RestrictedAccessException - if the node is not part of a live scene graph
CapabilityNotSetException - if appropriate capability is not set and this node is part of live scene graph
IllegalSharingException - if the node is a descendant of a SharedGroup node.

getLocalToVworld

public void getLocalToVworld(SceneGraphPath path,
                             Transform3D t)
Retrieves the local coordinates to virtual world coordinates transform for the particular path in the scene graph ending with this node. This is the composite of all transforms in the scene graph from the root down to this node via the specified Link nodes. It is only valid for nodes that are part of a live scene graph.

Parameters:
path - the specific path from the node to the Locale
t - the object that will receive the local coordinates to Vworld coordinates transform.
Throws:
RestrictedAccessException - if the node is not part of a live scene graph
CapabilityNotSetException - if appropriate capability is not set and this node is part of live scene graph
java.lang.IllegalArgumentException - if the specified path does not contain a valid Locale, or if the last node in the path is different from this node

cloneTree

public Node cloneTree()
Duplicates all the nodes of the specified sub-graph. For Group Nodes the group node is duplicated via a call to cloneNode and then cloneTree is called for each child node. For Leaf Nodes, component data can either be duplicated or be made a reference to the original data. Leaf Node cloneTree behavior is determined by the duplicateOnCloneTree flag found in every Leaf Node's component data class and by the forceDuplicate paramter.

Returns:
a reference to the cloned sub-graph.
Throws:
DanglingReferenceException - When a dangling reference is discovered during the cloneTree operation.
RestrictedAccessException - if this object is part of live or compiled scene graph
SceneGraphCycleException - if there is a cycle in the scene graph
See Also:
NodeComponent.setDuplicateOnCloneTree(boolean)

cloneTree

public Node cloneTree(boolean forceDuplicate)
Duplicates all the nodes of the specified sub-graph. For Group Nodes the group node is duplicated via a call to cloneNode and then cloneTree is called for each child node. For Leaf Nodes, component data can either be duplicated or be made a reference to the original data. Leaf Node cloneTree behavior is determined by the duplicateOnCloneTree flag found in every Leaf Node's component data class and by the forceDuplicate paramter.

Parameters:
forceDuplicate - when set to true, causes the duplicateOnCloneTree flag to be ignored. When false, the value of each node's duplicateOnCloneTree determines whether data is duplicated or copied.
Returns:
a reference to the cloned scene graph.
Throws:
DanglingReferenceException - When a dangling reference is discovered during the cloneTree operation.
RestrictedAccessException - if this object is part of live or compiled scene graph
SceneGraphCycleException - if there is a cycle in the scene graph
See Also:
NodeComponent.setDuplicateOnCloneTree(boolean)

cloneTree

public Node cloneTree(boolean forceDuplicate,
                      boolean allowDanglingReference)
Duplicates all the nodes of the specified sub-graph. For Group Nodes the group node is duplicated via a call to cloneNode and then cloneTree is called for each child node. For Leaf Nodes, component data can either be duplicated or be made a reference to the original data. Leaf Node cloneTree behavior is determined by the duplicateOnCloneTree flag found in every Leaf Node's component data class and by the forceDuplicate paramter.

Parameters:
forceDuplicate - when set to true, causes the duplicateOnCloneTree flag to be ignored. When false, the value of each node's duplicateOnCloneTree determines whether data is duplicated or copied.
Returns:
a reference to the cloned scene graph.
Throws:
DanglingReferenceException - When a dangling reference is discovered during the cloneTree operation and the allowDanglingReference parameter is false.
RestrictedAccessException - if this object is part of live or compiled scene graph
SceneGraphCycleException - if there is a cycle in the scene graph
See Also:
NodeComponent.setDuplicateOnCloneTree(boolean)

cloneTree

public Node cloneTree(NodeReferenceTable referenceTable)
Duplicates all the nodes of the specified sub-graph. For Group Nodes the group node is duplicated via a call to cloneNode and then cloneTree is called for each child node. For Leaf Nodes, component data can either be duplicated or be made a reference to the original data. Leaf Node cloneTree behavior is determined by the duplicateOnCloneTree flag found in every Leaf Node's component data class and by the forceDuplicate paramter.

Parameters:
referenceTable - table that stores the mapping between original and cloned nodes. All previous values in the referenceTable will be cleared before the clone is made.
Returns:
a reference to the cloned sub-graph.
Throws:
DanglingReferenceException - When a dangling reference is discovered during the cloneTree operation.
RestrictedAccessException - if this object is part of live or compiled scene graph
SceneGraphCycleException - if there is a cycle in the scene graph
Since:
Java 3D 1.2
See Also:
NodeComponent.setDuplicateOnCloneTree(boolean)

cloneTree

public Node cloneTree(NodeReferenceTable referenceTable,
                      boolean forceDuplicate)
Duplicates all the nodes of the specified sub-graph. For Group Nodes the group node is duplicated via a call to cloneNode and then cloneTree is called for each child node. For Leaf Nodes, component data can either be duplicated or be made a reference to the original data. Leaf Node cloneTree behavior is determined by the duplicateOnCloneTree flag found in every Leaf Node's component data class and by the forceDuplicate paramter.

Parameters:
referenceTable - table that stores the mapping between original and cloned nodes. All previous values in the referenceTable will be cleared before the clone is made.
forceDuplicate - when set to true, causes the duplicateOnCloneTree flag to be ignored. When false, the value of each node's duplicateOnCloneTree determines whether data is duplicated or copied.
Returns:
a reference to the cloned scene graph.
Throws:
DanglingReferenceException - When a dangling reference is discovered during the cloneTree operation.
RestrictedAccessException - if this object is part of live or compiled scene graph
SceneGraphCycleException - if there is a cycle in the scene graph
Since:
Java 3D 1.2
See Also:
NodeComponent.setDuplicateOnCloneTree(boolean)

cloneTree

public Node cloneTree(NodeReferenceTable referenceTable,
                      boolean forceDuplicate,
                      boolean allowDanglingReferences)
Duplicates all the nodes of the specified sub-graph. For Group Nodes the group node is duplicated via a call to cloneNode and then cloneTree is called for each child node. For Leaf Nodes, component data can either be duplicated or be made a reference to the original data. Leaf Node cloneTree behavior is determined by the duplicateOnCloneTree flag found in every Leaf Node's component data class and by the forceDuplicate paramter.

Parameters:
referenceTable - table that stores the mapping between original and cloned nodes. All previous values in the referenceTable will be cleared before the clone is made.
forceDuplicate - when set to true, causes the duplicateOnCloneTree flag to be ignored. When false, the value of each node's duplicateOnCloneTree determines whether data is duplicated or copied.
allowDanglingReferences - when set to true allows the cloneTree method to complete even whan a dangling reference is discovered. When this parameter is false a DanglingReferenceException is generated as soon as cloneTree detects this situation.
Returns:
a reference to the cloned scene graph.
Throws:
DanglingReferenceException - When a dangling reference is discovered during the cloneTree operation.
RestrictedAccessException - if this object is part of live or compiled scene graph
SceneGraphCycleException - if there is a cycle in the scene graph
Since:
Java 3D 1.2
See Also:
NodeComponent.setDuplicateOnCloneTree(boolean)

cloneNode

public Node cloneNode(boolean forceDuplicate)
Used to create a new instance of the node. This routine is called by cloneTree to duplicate the current node. cloneNode should be overridden by any user subclassed objects. All subclasses must have their cloneNode method consist of the following lines: 

     public Node cloneNode(boolean forceDuplicate) {
         UserSubClass usc = new UserSubClass();
         usc.duplicateNode(this, forceDuplicate);
         return usc;
     }
NOTE: Applications should not call this method directly. It should only be called by the cloneTree method.

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.
Throws:
RestrictedAccessException - if this object is part of live or compiled scene graph
See Also:
cloneTree(), duplicateNode(javax.media.j3d.Node, boolean), NodeComponent.setDuplicateOnCloneTree(boolean)

duplicateNode

public void duplicateNode(Node originalNode,
                          boolean forceDuplicate)
Copies all node information from originalNode into the current node. This method is called from the cloneNode method which is, in turn, called by the cloneTree method.

For any NodeComponent objects contained by the object being duplicated, each NodeComponent object's duplicateOnCloneTree value is used to determine whether the NodeComponent should be duplicated in the new node or if just a reference to the current node should be placed in the new node. This flag can be overridden by setting the forceDuplicate parameter in the cloneTree method to true.
NOTE: Applications should not call this method directly. It should only be called by the cloneNode method.

Parameters:
originalNode - the original node to duplicate.
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:
Group.cloneNode(boolean), duplicateNode(javax.media.j3d.Node, boolean), cloneTree(), NodeComponent.setDuplicateOnCloneTree(boolean)

setPickable

public void setPickable(boolean pickable)
When set to true this Node can be Picked. Setting to false indicates that this node and it's children are ALL unpickable.

Parameters:
pickable - Indicates if this node should be pickable or not

getPickable

public boolean getPickable()
Returns true if this Node is pickable, false if it is not pickable.

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