return group; } Note that the propagation of (Web site construction)
return group; } Note that the propagation of Boundsup the scenegraph hierarchy (from child to parent) does not occur with CollisionBounds. Cube4 has CollisionBoundsof ( 10, 10, 10) > (10,10,10) but these do not influence the Boundsof the parent Group1. Surprisingly, the CollisionBoundsof Cube4 do not influence the CollisionBoundsof the parent Group1 either. It appears that the application programmer is responsible for manually propagating CollisionBoundsfrom child to parent Nodes. 5.4 Group java.lang.Object | +–javax.media.j3d.SceneGraphObject | +–javax.media.j3d.Node | +–javax.media.j3d.Group Groupdefines a scenegraph Nodethat contains a collection of child Nodes. It defines the following child Nodemanagement methods: void addChild(Node child) java.util.Enumeration getAllChildren() Node getChild(int index) void insertChild(Node child, int index) void moveTo(BranchGroup branchGroup) int numChildren() void removeChild(int index) void setChild(Node child, int index) These methods essentially delegate, in obvious ways, to the internal collection that manages the child Nodes within the Group. Table 5.2 shows the capabilities defined by Group. Table 5.2 Capabilities defined by Group Capability bit Description ALLOW_CHILDREN_EXTEND Allows child Nodes to be added to the Group ALLOW_CHILDREN_READ Allows reading of child Nodes (e.g., getChild method) ALLOW_CHILDREN_WRITE Allows writing of child Nodes (e.g., setChild method) ALLOW_COLLISION_BOUNDS_READ Allows reading of collision Bounds ALLOW_COLLISION_BOUNDS_WRITE Allows writing of collision Bounds Groupis an important base class for the Java 3D Nodemanagement classes, and it can also be instantiated in its own right. For increased flexibility, however, I recommend BranchGroup Nodesbecause they can be dynamically added or removed from the scenegraph. The classes derived from Groupare shown in table 5.3. Table 5.3 Classes derived from Group Class Description BranchGroup A dynamically insertable and removable Group 73
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