Java 3D API Specification in Java

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Java 3D API Specification
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GROUP NODE OBJECTS public final void setChildMask(BitSet childMask) public final BitSet getChildMask()
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SharedGroup Node
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These methods access or modify the mask used to select the children that the Switch object will draw when the whichChild parameter is CHILD_MASK This parameter is ignored during rendering if the whichChild parameter is a value other than CHILD_MASK
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public final Node currentChild()
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This method returns the currently selected child If whichChild is out of range, or is set to CHILD_MASK, CHILD_ALL, or CHILD_NONE, then null is returned
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public Node cloneNode(boolean forceDuplicate) Tree
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This method creates a new instance of the node This routine is called by cloneto duplicate the current node
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public void duplicateNode(Node originalNode, boolean forceDuplicate)
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This method copies all the node information from the originalNode into the current node This method is called from the cloneNode method, which is in turn called by the cloneTree method For each NodeComponent object contained by the object being duplicated, the NodeComponent 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 ag can be overridden by setting the forceDuplicate parameter in the cloneTree method to true
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SharedGroup Node
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A SharedGroup node provides a mechanism for sharing the same subgraph in different parts of the tree via a Link node See Section 611, SharedGroup Node, for a description of this node
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Version 11 Alpha 01, February 27, 1998
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C H A P T E R
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Leaf Node Objects
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EAF nodes de ne atomic entities such as geometry, lights, and sounds The leaf nodes and their associated meanings follow
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Leaf Node
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The Leaf node is an abstract class for all scene graph nodes that have no children Leaf nodes specify lights, geometry, and sounds; provide special linking and instancing capabilities for sharing scene graphs; and provide a view platform for positioning and orienting a view in the virtual world Figure 5-1 shows the Leaf node object hierarchy Constructors
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public Leaf()
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Constructs and initializes a new Leaf object Methods The Leaf node object de nes the following methods
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public void updateNodeReferences(NodeReferenceTable referenceTable)
This method is called by the cloneTree method (see Section 62, Cloning Subgraphs ) after all nodes in the subgraph have been cloned The user can query the NodeReferenceTable object to determine if any nodes that the Leaf node references have been duplicated by the cloneTree call and, if so, what the corresponding Node is in the new subgraph If a user extends a prede ned Java 3D object and adds a reference to another node, this method must be de ned in order to ensure proper operation of the cloneTree method The rst statement in the
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Leaf Node
LEAF NODE OBJECTS
user s updateNodeReferences method ences(referenceTable) For prede ned implemented automatically
must be superupdateNodeReferJava 3D nodes, this method will be
The NodeReferenceTable object is passed to the updateNodeReferences method and allows references from the old subgraph to be translated into references in the cloned subgraph See Section 625, NodeReferenceTable Object, for more details
public Node cloneTree(boolean forceDuplicate)
This method duplicates all nodes of the speci ed subgraph For group nodes, the node is rst 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 ag found in every leaf node s component data class and by the forceDuplicate parameter
SceneGraphObject Node Leaf Background Behavior Prede ned behaviors BoundingLeaf Clip Fog ExponentialFog LinearFog Light AmbientLight DirectionalLight PointLight SpotLight Link Morph Shape3D Sound BackgroundSound PointSound ConeSound Soundscape ViewPlatform Figure 5-1 Leaf Node Hierarchy
Java 3D API Specification
LEAF NODE OBJECTS
Shape3D Node
Shape3D Node
The Shape3D leaf node object speci es all geometric objects It contains two components: a reference to the shape s geometry and its appearance component The Geometry object de nes the shape s geometric data The Appearance object speci es that object s appearance attributes, including color, material, texture, and so on See 7, Node Component Objects for details of the Geometry and Appearance objects Constants The Shape3D node object de nes the following ags
public public public public public public static static static static static static final final final final final final int int int int int int ALLOW_GEOMETRY_READ ALLOW_GEOMETRY_WRITE ALLOW_APPEARANCE_READ ALLOW_APPEARANCE_WRITE ALLOW_COLLISION_BOUNDS_WRITE ALLOW_COLLISION_BOUNDS_READ
These ags, when enabled using the setCapability method, allow reading and writing of the Geometry and Appearance component objects and the collision bounds, respectively These capability ags are enforced only when the node is part of a live or compiled scene graph Constructors The Shape3D node object de nes the following constructors
public Shape3D(Geometry geometry, Appearance appearance) public Shape3D(Geometry geometry) public Shape3D()
The rst form constructs and initializes a new Shape3D object with the speci ed geometry and appearance components The second form uses the speci ed geometry and a null appearance component The third form uses both a null geometry component and a null appearance component If the geometry component is null, then no geometry is drawn If the appearance component is null, then default values are used for all appearance attributes Methods The Shape3D node object de nes the following methods
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Shape3D Node public final void setGeometry(Geometry geometry) public final Geometry getGeometry()