javax.media.j3d
Class ModelClip

java.lang.Object
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  +--javax.media.j3d.SceneGraphObject
        |
        +--javax.media.j3d.Node
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              +--javax.media.j3d.Leaf
                    |
                    +--javax.media.j3d.ModelClip

public class ModelClip

extends Leaf

The ModelClip leaf node defines a set of 6 arbitrary clipping planes in the virtual universe. The planes are specified in the local coordinate system of this node, and may be individually enabled or disabled. This node also specifies a region of influence in which this set of planes is active.

A ModelClip node also contains a list of Group nodes that specifies the hierarchical scope of this ModelClip. If the scope list is empty, then the ModelClip node has universe scope: all nodes within the region of influence are affected by this ModelClip node. If the scope list is non-empty, then only those Leaf nodes under the Group nodes in the scope list are affected by this ModelClip node (subject to the influencing bounds).

If the regions of influence of multiple ModelClip nodes overlap, the Java 3D system will choose a single set of model clip planes for those objects that lie in the intersection. This is done in an implementation-dependent manner, but in general, the ModelClip node that is "closest" to the object is chosen.

The individual planes specify a half-space defined by the equation:

Ax + By + Cz + D <= 0

where A, B, C, D are the parameters that specify the plane. The parameters are passed in the x, y, z, and w fields, respectively, of a Vector4d object. The intersection of the set of half-spaces corresponding to the enabled planes in this ModelClip node defines a region in which points are accepted. Points in this acceptance region will be rendered (subject to view clipping and other attributes). Points that are not in the acceptance region will not be rendered.

Since:

Java 3D 1.2

Field Summary

static int	ALLOW_ENABLE_READ Specifies that the ModelClip node allows read access to its enable flags at runtime.
static int	ALLOW_ENABLE_WRITE Specifies that the ModelClip node allows write access to its enable flags at runtime.
static int	ALLOW_INFLUENCING_BOUNDS_READ Specifies that the ModelClip node allows read access to its influencing bounds and bounding leaf at runtime.
static int	ALLOW_INFLUENCING_BOUNDS_WRITE Specifies that the ModelClip node allows write access to its influencing bounds and bounding leaf at runtime.
static int	ALLOW_PLANE_READ Specifies that the ModelClip node allows read access to its planes at runtime.
static int	ALLOW_PLANE_WRITE Specifies that the ModelClip node allows write access to its planes at runtime.
static int	ALLOW_SCOPE_READ Specifies that this ModelClip node allows read access to its scope information at runtime.
static int	ALLOW_SCOPE_WRITE Specifies that this ModelClip node allows write access to its scope information at runtime.

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_PICKABLE_READ, ALLOW_PICKABLE_WRITE, ENABLE_COLLISION_REPORTING, ENABLE_PICK_REPORTING

Constructor Summary

ModelClip()
Constructs a ModelClip node with default parameters.

ModelClip(Vector4d[] planes)
Constructs a ModelClip node using the specified planes.

ModelClip(Vector4d[] planes, boolean[] enables)
Constructs a ModelClip node using the specified planes and enable flags.

Method Summary

void	addScope(Group scope) Appends the specified Group node to this ModelClip node's list of scopes.
Node	cloneNode(boolean forceDuplicate) Used to create a new instance of the node.
java.util.Enumeration	getAllScopes() Returns an enumeration of this ModelClip node's list of scopes.
boolean	getEnable(int planeNum) Retrieves the specified enable flag from this ModelClip node.
void	getEnables(boolean[] enables) Retrieves the per-plane enable flags from this ModelClip node.
BoundingLeaf	getInfluencingBoundingLeaf() Retrieves the ModelClip node's influencing bounding leaf.
Bounds	getInfluencingBounds() Retrieves the ModelClip node's influencing bounds.
void	getPlane(int planeNum, Vector4d plane) Retrieves the specified clipping plane from this ModelClip node.
void	getPlanes(Vector4d[] planes) Retrieves the clipping planes from this ModelClip node.
Group	getScope(int index) Retrieves the Group node at the specified index from this ModelClip node's list of scopes.
void	insertScope(Group scope, int index) Inserts the specified Group node into this ModelClip node's list of scopes at the specified index.
int	numScopes() Returns the number of nodes in this ModelClip node's list of scopes.
void	removeScope(int index) Removes the node at the specified index from this ModelClip node's list of scopes.
void	setEnable(int planeNum, boolean enable) Sets the specified enable flag of this ModelClip node.
void	setEnables(boolean[] enables) Sets the per-plane enable flags of this ModelClip node to the specified values.
void	setInfluencingBoundingLeaf(BoundingLeaf region) Set the ModelClip node's influencing region to the specified bounding leaf.
void	setInfluencingBounds(Bounds region) Set the ModelClip node's influencing region to the specified bounds.
void	setPlane(int planeNum, Vector4d plane) Sets the specified clipping plane of this ModelClip node.
void	setPlanes(Vector4d[] planes) Sets the clipping planes of this ModelClip node to the specified planes.
void	setScope(Group scope, int index) Replaces the node at the specified index in this ModelClip node's list of scopes with the specified Group node.
void	updateNodeReferences(NodeReferenceTable referenceTable) Callback used to allow a node to check if any scene graph objects referenced by that node have been duplicated via a call to cloneTree.

Methods inherited from class javax.media.j3d.Node

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

Methods inherited from class javax.media.j3d.SceneGraphObject

clearCapability, duplicateSceneGraphObject, getCapability, getUserData, isCompiled, isLive, setCapability, setUserData

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

ALLOW_INFLUENCING_BOUNDS_READ

public static final int ALLOW_INFLUENCING_BOUNDS_READ

Specifies that the ModelClip node allows read access to its influencing bounds and bounding leaf at runtime.

ALLOW_INFLUENCING_BOUNDS_WRITE

public static final int ALLOW_INFLUENCING_BOUNDS_WRITE

Specifies that the ModelClip node allows write access to its influencing bounds and bounding leaf at runtime.

ALLOW_PLANE_READ

public static final int ALLOW_PLANE_READ

Specifies that the ModelClip node allows read access to its planes at runtime.

ALLOW_PLANE_WRITE

public static final int ALLOW_PLANE_WRITE

Specifies that the ModelClip node allows write access to its planes at runtime.

ALLOW_ENABLE_READ

public static final int ALLOW_ENABLE_READ

Specifies that the ModelClip node allows read access to its enable flags at runtime.

ALLOW_ENABLE_WRITE

public static final int ALLOW_ENABLE_WRITE

Specifies that the ModelClip node allows write access to its enable flags at runtime.

ALLOW_SCOPE_READ

public static final int ALLOW_SCOPE_READ

Specifies that this ModelClip node allows read access to its scope information at runtime.

ALLOW_SCOPE_WRITE

public static final int ALLOW_SCOPE_WRITE

Specifies that this ModelClip node allows write access to its scope information at runtime.

Constructor Detail

ModelClip

public ModelClip()

Constructs a ModelClip node with default parameters. The default values are as follows:

planes[0] : x <= 1 (1,0,0,-1)
planes[1] : -x <= 1 (-1,0,0,-1)
planes[2] : y <= 1 (0,1,0,-1)
planes[3] : -y <= 1 (0,-1,0,-1)
planes[4] : z <= 1 (0,0,1,-1)
planes[5] : -z <= 1 (0,0,-1,-1)
enables : all planes enabled
scope : empty (universe scope)
influencing bounds : null
influencing bounding leaf : null

ModelClip

public ModelClip(Vector4d[] planes)

Constructs a ModelClip node using the specified planes. The individual planes are copied into this node. All planes are enabled.

Parameters:

planes - an array of 6 model clipping planes

ModelClip

public ModelClip(Vector4d[] planes,
                 boolean[] enables)

Constructs a ModelClip node using the specified planes and enable flags. The individual planes and enable flags are copied into this node.

Parameters:

planes - an array of 6 model clipping planes

enables - an array of 6 enable flags

Method Detail

setInfluencingBounds

public void setInfluencingBounds(Bounds region)

Set the ModelClip node's influencing region to the specified bounds. This is used when the influencing bounding leaf is set to null.

Parameters:

region - the bounds that contains the new influencing region.

Throws:

CapabilityNotSetException - if appropriate capability is not set and this object is part of live or compiled scene graph

getInfluencingBounds

public Bounds getInfluencingBounds()

Retrieves the ModelClip node's influencing bounds.

Returns:

this node's influencing bounds information

Throws:

CapabilityNotSetException - if appropriate capability is not set and this object is part of live or compiled scene graph

setInfluencingBoundingLeaf

public void setInfluencingBoundingLeaf(BoundingLeaf region)

Set the ModelClip node's influencing region to the specified bounding leaf. When set to a value other than null, this overrides the influencing bounds object.

Parameters:

region - the bounding leaf node used to specify the new influencing region.

Throws:

CapabilityNotSetException - if appropriate capability is not set and this object is part of live or compiled scene graph

getInfluencingBoundingLeaf

public BoundingLeaf getInfluencingBoundingLeaf()

Retrieves the ModelClip node's influencing bounding leaf.

Returns:

this node's influencing bounding leaf information

Throws:

CapabilityNotSetException - if appropriate capability is not set and this object is part of live or compiled scene graph

setScope

public void setScope(Group scope,
                     int index)

Replaces the node at the specified index in this ModelClip node's list of scopes with the specified Group node. By default, ModelClip nodes are scoped only by their influencing bounds. This allows them to be further scoped by a list of nodes in the hierarchy.

Parameters:

scope - the Group node to be stored at the specified index.

index - the index of the Group node to be replaced.

Throws:

CapabilityNotSetException - if appropriate capability is not set and this object is part of live or compiled scene graph

getScope

public Group getScope(int index)

Retrieves the Group node at the specified index from this ModelClip node's list of scopes.

Parameters:

index - the index of the Group node to be returned.

Returns:

the Group node at the specified index.

Throws:

CapabilityNotSetException - if appropriate capability is not set and this object is part of live or compiled scene graph

insertScope

public void insertScope(Group scope,
                        int index)

Inserts the specified Group node into this ModelClip node's list of scopes at the specified index. By default, ModelClip nodes are scoped only by their influencing bounds. This allows them to be further scoped by a list of nodes in the hierarchy.

Parameters:

scope - the Group node to be inserted at the specified index.

index - the index at which the Group node is inserted.

Throws:

CapabilityNotSetException - if appropriate capability is not set and this object is part of live or compiled scene graph

removeScope

public void removeScope(int index)

Removes the node at the specified index from this ModelClip node's list of scopes. If this operation causes the list of scopes to become empty, then this ModelClip will have universe scope: all nodes within the region of influence will be affected by this ModelClip node.

Parameters:

index - the index of the Group node to be removed.

Throws:

CapabilityNotSetException - if appropriate capability is not set and this object is part of live or compiled scene graph

getAllScopes

public java.util.Enumeration getAllScopes()

Returns an enumeration of this ModelClip node's list of scopes.

Returns:

an Enumeration object containing all nodes in this ModelClip node's list of scopes.

Throws:

CapabilityNotSetException - if appropriate capability is not set and this object is part of live or compiled scene graph

addScope

public void addScope(Group scope)

Appends the specified Group node to this ModelClip node's list of scopes. By default, ModelClip nodes are scoped only by their influencing bounds. This allows them to be further scoped by a list of nodes in the hierarchy.

Parameters:

scope - the Group node to be appended.

Throws:

CapabilityNotSetException - if appropriate capability is not set and this object is part of live or compiled scene graph

numScopes

public int numScopes()

Returns the number of nodes in this ModelClip node's list of scopes. If this number is 0, then the list of scopes is empty and this ModelClip node has universe scope: all nodes within the region of influence are affected by this ModelClip node.

Returns:

the number of nodes in this ModelClip node's list of scopes.

Throws:

CapabilityNotSetException - if appropriate capability is not set and this object is part of live or compiled scene graph

setPlanes

public void setPlanes(Vector4d[] planes)

Sets the clipping planes of this ModelClip node to the specified planes. The individual planes are copied into this node.

Parameters:

planes - an array of 6 model clipping planes

getPlanes

public void getPlanes(Vector4d[] planes)

Retrieves the clipping planes from this ModelClip node. The individual planes are copied into the specified planes, which must be allocated by the caller. The array must be large enough to hold all of the vectors.

Parameters:

planes - an array of 6 vectors that will receive the model clipping planes from this node

setPlane

public void setPlane(int planeNum,
                     Vector4d plane)

Sets the specified clipping plane of this ModelClip node. The specified plane is copied into this node.

Parameters:

planeNum - specifies which model clipping plane (0-5) is replaced

plane - new model clipping plane

getPlane

public void getPlane(int planeNum,
                     Vector4d plane)

Retrieves the specified clipping plane from this ModelClip node. The plane is copied into the specified plane, which must be allocated by the caller.

Parameters:

planeNum - specifies which model clipping plane (0-5) is retrieved

plane - a vector that will receive the specified model clipping plane from this node

setEnables

public void setEnables(boolean[] enables)

Sets the per-plane enable flags of this ModelClip node to the specified values.

Parameters:

enables - an array of 6 enable flags

getEnables

public void getEnables(boolean[] enables)

Retrieves the per-plane enable flags from this ModelClip node. The enable flags are copied into the specified array. The array must be large enough to hold all of the enables.

Parameters:

enables - an array of 6 booleans that will receive the enable flags from this node

setEnable

public void setEnable(int planeNum,
                      boolean enable)

Sets the specified enable flag of this ModelClip node.

Parameters:

planeNum - specifies which enable flag (0-5) is set

enable - new enable flag

getEnable

public boolean getEnable(int planeNum)

Retrieves the specified enable flag from this ModelClip node.

Parameters:

planeNum - specifies which enable flag (0-5) is retrieved

Returns:

the specified enable flag

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.

Overrides:

cloneNode in class Node

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)

updateNodeReferences

public void updateNodeReferences(NodeReferenceTable referenceTable)

Callback used to allow a node to check if any scene graph objects referenced by that node have been duplicated via a call to cloneTree. This method is called by cloneTree after all nodes in the sub-graph have been duplicated. The cloned Leaf node's method will be called and the Leaf node can then look up any object references by using the getNewObjectReference method found in the NodeReferenceTable object. If a match is found, a reference to the corresponding object in the newly cloned sub-graph is returned. If no corresponding reference is found, either a DanglingReferenceException is thrown or a reference to the original object is returned depending on the value of the allowDanglingReferences parameter passed in the cloneTree call.

NOTE: Applications should not call this method directly. It should only be called by the cloneTree method.

Overrides:

updateNodeReferences in class SceneGraphObject

Parameters:

referenceTable - a NodeReferenceTableObject that contains the getNewObjectReference method needed to search for new object instances.

See Also:

NodeReferenceTable, Node.cloneTree(), DanglingReferenceException