Package 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.

For more information, see the Introduction to the Java 3D API.

NOTE: Applications should not extend this class directly.

  • Field Details

    • 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:

    • 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:

    • ALLOW_BOUNDS_READ

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

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

    • ALLOW_PICKABLE_READ

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

    • ALLOW_PICKABLE_WRITE

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

    • ALLOW_COLLIDABLE_READ

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

    • ALLOW_COLLIDABLE_WRITE

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

    • 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:

    • 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:

    • 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:

    • ALLOW_PARENT_READ

      public static final int ALLOW_PARENT_READ
      Specifies that this Node allows read access to its parent Group node.
      Since:
      Java 3D 1.4
      See Also:

    • ALLOW_LOCALE_READ

      public static final int ALLOW_LOCALE_READ
      Specifies that this Node allows read access to its Locale.
      Since:
      Java 3D 1.4
      See Also:

  • Constructor Details

    • Node

      public Node()
      Constructs a Node object with default parameters. The default values are as follows:
        pickable : true
        collidable : true
        bounds auto compute : true
        bounds : N/A (automatically computed)

  • Method Details

    • getParent

      public Node getParent()
      Returns:
      the parent of this node, or null if this node has no parent
      Throws:
      CapabilityNotSetException - if appropriate capability is not set and 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. If the node is not part of a live scene graph then the coordinates are calculated as if the graph was attached at the origin of a locale.
      Parameters:
      t - the object that will receive the local coordinates to Vworld coordinates transform.
      Throws:
      RestrictedAccessException - if the node is compiled but not part of a live scene graph
      CapabilityNotSetException - if appropriate capability is not set and this node is part of live or compiled 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
      IllegalArgumentException - if the specified path does not contain a valid Locale, or if the last node in the path is different from this node
      IllegalSharingException - if the node is not a descendant of a SharedGroup node.

    • getLocale

      public Locale getLocale()
      Retrieves the locale to which this node is attached. If the node is not part of a live scene graph, null is returned.
      Returns:
      the locale to which this node is attached.
      Throws:
      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.
      Since:
      Java 3D 1.4

    • 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:

    • 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:

    • cloneTree

      public Node cloneTree(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:
      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 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:

    • 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:

    • 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:

    • 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:

    • 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:

    • 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:

    • 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.