com.sun.j3d.utils.picking

Class PickResult

java.lang.Object

com.sun.j3d.utils.picking.PickResult

public class PickResult
extends Object

Stores information about a pick hit. Detailed information about the pick and each intersection of the PickShape with the picked Node can be inquired. The PickResult is constructed with basic information and more detailed information is generated as needed. The additional information is only available if capability bits on the scene graph Nodes are set properly; PickTool.setCapabilties(Node, int) can be used to ensure correct capabilites are set. Inquiring data which is not available due to capabilties not being set will generate a CapabilityNotSet exception.

A PickResult can be used to calculate intersections on Node which is not part of a live scene graph using the constructor which takes a local to VWorld transformation for the Node.

Pick hits on TriangleStrip primitives will store the triangle points in the PickIntersection with the verticies in counter-clockwise order. For triangles which start with an odd numbered vertex this will be the the opposite of the order of the points in the TriangleStrip. This way the triangle in the PickIntersection will display the same was as the triangle in the strip.

If the Shape3D being picked has multiple geometry arrays, the arrays are stored in the PickResult and referred to by a geometry index.

If the Shape3D refers to a CompressedGeometry, the geometry is decompressed into an array of Shape3D nodes which can be inquired. The geometry NodeComponents for the Shape3D nodes are stored and used as if the Shape3D had multiple geometries. If there are multiple CompressedGeometries on the Shape3D, the decompressed Shape3Ds and GeometryArrays will be stored sequentially.

The intersection point for Morph nodes cannot be calculated using the displayed geometry due to limitations in the current Java3D core API (the current geometry of the the Morph cannot be inquired). Instead the geometry at index 0 in the Morph is used. This limitation may be eliminated in a future release of Java3D.

Field Summary

Fields

Modifier and Type	Field and Description
static int	BRANCH_GROUP Flag to pass to getNode(int) to return a BranchGroup node from the SceneGraphPath.
static int	GROUP Flag to pass to getNode(int) to return a Group node from the SceneGraphPath.
static int	LINK Flag to pass to getNode(int) to return a Link node from the SceneGraphPath.
static int	MORPH Flag to pass to getNode(int) to return a Morph node from the SceneGraphPath.
static int	PRIMITIVE Flag to pass to getNode(int) to return a Primitive node from the SceneGraphPath.
static int	SHAPE3D Flag to pass to getNode(int) to return a Shape3D node from the SceneGraphPath.
static int	SWITCH Flag to pass to getNode(int) to return a Switch node from the SceneGraphPath.
static int	TRANSFORM_GROUP Flag to pass to getNode(int) to return a TransformGroup node from the SceneGraphPath.

Constructor Summary

Constructors

Constructor and Description
PickResult(javax.media.j3d.Node pn, javax.media.j3d.Transform3D l2vw, javax.media.j3d.PickShape ps) Construct a PickResult using the Node and localToVWorld transform
PickResult(javax.media.j3d.SceneGraphPath sgp, javax.media.j3d.PickShape ps) Construct a PickResult using a SceneGraphPath

Method Summary

Methods

Modifier and Type	Method and Description
PickIntersection	getClosestIntersection(javax.vecmath.Point3d pt) Gets the PickIntersection in this PickResult that is closest to a point
javax.media.j3d.Shape3D[]	getCompressedGeometryShape3Ds() Get the array of Shape3Ds that came from decompressing a CompressedGeometry on the picked node.
boolean	getFirstPickEnable() Return the "first intersection only" value.
javax.media.j3d.GeometryArray	getGeometryArray() Get the GeometryArray at index 0 for the picked node
javax.media.j3d.GeometryArray[]	getGeometryArrays() Get the array of GeometryArrays for the picked node
PickIntersection	getIntersection(int index) Returns a specific PickIntersection object
javax.media.j3d.Transform3D	getLocalToVworld() Get the localToVworld transform for the Node
javax.media.j3d.Node	getNode(int flags) Get the first node of a certain type up the SceneGraphPath
javax.media.j3d.Node	getObject() Get the picked node
javax.media.j3d.PickShape	getPickShape() Get the PickShape used for intersections
javax.media.j3d.SceneGraphPath	getSceneGraphPath() Get the SceneGraphPath.
int	numCompressedGeometryShape3Ds() Get the number of Shape3Ds that came from decompressing a CompressedGeometry on the picked node.
int	numGeometryArrays() Get the number of GeometryArrays for the picked node
int	numIntersections() Returns the number of PickIntersections in the PickResult.
void	setFirstIntersectOnly(boolean flag) Set the PickResult to find only the first intersection of the PickShape with the Node.
String	toString() Returns String representation

Methods inherited from class java.lang.Object

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

Field Detail

SHAPE3D

public static final int SHAPE3D

Flag to pass to getNode(int) to return a Shape3D node from the SceneGraphPath.

See Also:

Constant Field Values

MORPH

public static final int MORPH

Flag to pass to getNode(int) to return a Morph node from the SceneGraphPath.

See Also:

Constant Field Values

PRIMITIVE

public static final int PRIMITIVE

Flag to pass to getNode(int) to return a Primitive node from the SceneGraphPath.

See Also:

Constant Field Values

LINK

public static final int LINK

Flag to pass to getNode(int) to return a Link node from the SceneGraphPath.

See Also:

Constant Field Values

GROUP

public static final int GROUP

Flag to pass to getNode(int) to return a Group node from the SceneGraphPath.

See Also:

Constant Field Values

TRANSFORM_GROUP

public static final int TRANSFORM_GROUP

Flag to pass to getNode(int) to return a TransformGroup node from the SceneGraphPath.

See Also:

Constant Field Values

BRANCH_GROUP

public static final int BRANCH_GROUP

Flag to pass to getNode(int) to return a BranchGroup node from the SceneGraphPath.

See Also:

Constant Field Values

SWITCH

public static final int SWITCH

Flag to pass to getNode(int) to return a Switch node from the SceneGraphPath.

See Also:

Constant Field Values

Constructor Detail

PickResult

public PickResult(javax.media.j3d.SceneGraphPath sgp,
          javax.media.j3d.PickShape ps)

Construct a PickResult using a SceneGraphPath

Parameters:

sgp - SceneGraphPath associated with this PickResult

ps - The pickShape to intersect against

PickResult

public PickResult(javax.media.j3d.Node pn,
          javax.media.j3d.Transform3D l2vw,
          javax.media.j3d.PickShape ps)

Construct a PickResult using the Node and localToVWorld transform

Parameters:

pn - The picked node.

l2vw - The local to VWorld transformation for the node

ps - The PickShape to intersect against

Throws:

IllegalArgumentException - If the node is not a Morph or Shape3D.

Method Detail

getSceneGraphPath

public javax.media.j3d.SceneGraphPath getSceneGraphPath()

Get the SceneGraphPath. This will be null if the non SceneGraphPath constructor was used.

getLocalToVworld

public javax.media.j3d.Transform3D getLocalToVworld()

Get the localToVworld transform for the Node

getGeometryArray

public javax.media.j3d.GeometryArray getGeometryArray()

Get the GeometryArray at index 0 for the picked node

getGeometryArrays

public javax.media.j3d.GeometryArray[] getGeometryArrays()

Get the array of GeometryArrays for the picked node

numGeometryArrays

public int numGeometryArrays()

Get the number of GeometryArrays for the picked node

numCompressedGeometryShape3Ds

public int numCompressedGeometryShape3Ds()

Get the number of Shape3Ds that came from decompressing a CompressedGeometry on the picked node.

getCompressedGeometryShape3Ds

public javax.media.j3d.Shape3D[] getCompressedGeometryShape3Ds()

Get the array of Shape3Ds that came from decompressing a CompressedGeometry on the picked node.

getPickShape

public javax.media.j3d.PickShape getPickShape()

Get the PickShape used for intersections

setFirstIntersectOnly

public void setFirstIntersectOnly(boolean flag)

Set the PickResult to find only the first intersection of the PickShape with the Node. The default is false (all intersections are found)

getFirstPickEnable

public boolean getFirstPickEnable()

Return the "first intersection only" value.

numIntersections

public int numIntersections()

Returns the number of PickIntersections in the PickResult.

Returns:

the number of intersections

getIntersection

public PickIntersection getIntersection(int index)

Returns a specific PickIntersection object

Parameters:

index - the index number

Returns:

the PickIntersection referenced by the index number

getClosestIntersection

public PickIntersection getClosestIntersection(javax.vecmath.Point3d pt)

Gets the PickIntersection in this PickResult that is closest to a point

Parameters:

pt - the point to use for distance calculations

Returns:

the closest PickIntersection object

toString

public String toString()

Returns String representation

Overrides:

toString in class Object

Returns:

string representation of this object

getObject

public javax.media.j3d.Node getObject()

Get the picked node

getNode

public javax.media.j3d.Node getNode(int flags)

Get the first node of a certain type up the SceneGraphPath

Parameters:

flags - the type of node we are interested in

Returns:

a Node object