## com.sun.j3d.utils.picking
Class PickTool

    java.lang.Object
      com.sun.j3d.utils.picking.PickTool

Direct Known Subclasses:
  PickCanvas

    public class PickTool

extends java.lang.Object

The base class for picking operations. The picking methods will return a PickResult object for each object picked, which can then be queried to obtain more detailed information about the specific objects that were picked.

The pick mode specifies the detail level of picking before the PickResult is returned:

- PickTool.BOUNDS - Pick using the bounds of the pickable nodes. The PickResult returned will contain the SceneGraphPath to the picked Node.
- PickTool.GEOMETRY will pick using the geometry of the pickable nodes. The PickResult returned will contain the SceneGraphPath to the picked Node. Geometry nodes in the scene must have the ALLOW_INTERSECT capability set for this mode.
- PickTool.GEOMETRY_INTERSECT_INFO -is the same as GEOMETRY, but the the PickResult will also include information on each intersection of the pick shape with the geometry. The intersection information includes the sub-primitive picked (that is, the point, line, triangle or quad), the closest vertex to the center of the pick shape, and the intersection's coordinate, normal, color and texture coordinates. To allow this information to be generated, Shape3D and Morph nodes must have the ALLOW_GEOMETRY_READ capability set and GeometryArrays must have the ALLOW_FORMAT_READ, ALLOW_COUNT_READ, and ALLOW_COORDINATE_READ capabilities set, plus the ALLOW_COORDINATE_INDEX_READ capability for indexed geometry. To inquire the intersection color, normal or texture coordinates the corresponding READ capability bits must be set on the GeometryArray.

The utility method `PickTool.setCapabilities(Node, int)` can be used before the scene graph is made live to set the capabilities of Shape3D, Morph or Geometry nodes to allow picking.

A PickResult from a lower level of detail pick can be used to inquire more detailed information if the capibility bits are set. This can be used to filter the PickResults before the more computationally intensive intersection processing. For example, the application can do a BOUNDS pick and then selectively inquire intersections on some of the PickResults. This will save the effort of doing intersection computation on the other PickResults. However, inquiring the intersections from a GEOMETRY pick will make the intersection computation happen twice, use GEOMETRY_INTERSECT_INFO if you want to inquire the intersection information on all the PickResults.

When using pickAllSorted or pickClosest methods, the picks will be sorted by the distance from the start point of the pick shape to the intersection point.

Morph nodes cannot be picked using the displayed geometry in GEOMETRY_INTERSECT_INFO mode due to limitations in the current Java3D core API (the current geometry of the the Morph cannot be inquired). Instead they are picked using the geometry at index 0 in the Morph, this limitation may be eliminated in a future release of Java3D.

If the pick shape is a PickBounds, the pick result will contain only the scene graph path, even if the mode is GEOMETRY_INTERSECT_INFO.

Field Summary
`static int` `BOUNDS` Use this mode to pick by bounds and get basic information on the pick.
`static int` `GEOMETRY` Use this mode to pick by geometry and get basic information on the pick.
`static int` `GEOMETRY_INTERSECT_INFO` Use this mode to pick by geometry and save information about the intersections (intersected primitive, intersection point and closest vertex).
`static int` `INTERSECT_COORD` Flag to pass to `setCapabilities(Node, int)`to set the Node's capabilities to allow inquiry of the intersection coordinate information.``
`static int` `INTERSECT_FULL` Flag to pass to `setCapabilities(Node, int)`to set the Node's capabilities to allow inquiry of all intersection information.``
`static int` `INTERSECT_TEST` Flag to pass to `setCapabilities(Node, int)`to set the Node's capabilities to allow intersection tests, but not inquire information about the intersections (use for GEOMETRY mode).``
`protected boolean` `userDefineShape`

Constructor Summary
`PickTool(BranchGroup b)` Constructor with BranchGroup to be picked.
`PickTool(Locale l)` Constructor with the Locale to be picked.

Method Summary
`BranchGroup` `getBranchGroup()` Returns the BranchGroup to be picked if the tool was initialized with a BranchGroup, null otherwise.
`Locale` `getLocale()` Returns the Locale to be picked if the tool was initialized with a Locale, null otherwise.
`int` `getMode()` Gets the picking detail mode.
`PickShape` `getPickShape()` Returns the PickShape for this object.
`Point3d` `getStartPosition()` Returns the start postion used for distance measurement.
`PickResult[]` `pickAll()` Selects all the nodes that intersect the PickShape.
`PickResult[]` `pickAllSorted()` Select all the nodes that intersect the PickShape, returned sorted.
`PickResult` `pickAny()` Select one of the nodes that intersect the PickShape
`PickResult` `pickClosest()` Select the closest node that intersects the PickShape.
`Locale` `setBranchGroup(Locale l)` Deprecated. This method does nothing other than return its input parameter.
`static void` `setCapabilities(Node node, int level)` Sets the capabilities on the Node and it's components to allow picking at the specified detail level.
`void` `setMode(int mode)` Sets the picking detail mode.
`void` `setShape(PickShape ps, Point3d startPt)` Sets the pick shape to a user-provided PickShape object
`void` `setShapeBounds(Bounds bounds, Point3d startPt)` Sets the pick shape to use a user-provided Bounds object
`void` `setShapeConeRay(Point3d start, Vector3d dir, double angle)` Sets the pick shape to an infinite PickCone.
`void` `setShapeConeSegment(Point3d start, Point3d end, double angle)` Sets the pick shape to a capped PickCone
`void` `setShapeCylinderRay(Point3d start, Vector3d dir, double radius)` Sets the pick shape to an infinite PickCylinder.
`void` `setShapeCylinderSegment(Point3d start, Point3d end, double radius)` Sets the pick shape to a capped PickCylinder
`void` `setShapeRay(Point3d start, Vector3d dir)` Sets the pick shape to a PickRay.
`void` `setShapeSegment(Point3d start, Point3d end)` Sets the pick shape to a PickSegment.

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Field Detail

### userDefineShape

    protected boolean userDefineShape

### BOUNDS

    public static final int BOUNDS

  Use this mode to pick by bounds and get basic information on the pick.

  See Also:
    Constant Field Values

### GEOMETRY

    public static final int GEOMETRY

  Use this mode to pick by geometry and get basic information on the pick.

  See Also:
    Constant Field Values

### GEOMETRY_INTERSECT_INFO

    public static final int GEOMETRY_INTERSECT_INFO

  Use this mode to pick by geometry and save information about the intersections (intersected primitive, intersection point and closest vertex).

  See Also:
    Constant Field Values

### INTERSECT_TEST

    public static final int INTERSECT_TEST

  Flag to pass to `setCapabilities(Node, int)`to set the Node's capabilities to allow intersection tests, but not inquire information about the intersections (use for GEOMETRY mode).

  See Also:
    `setCapabilities(javax.media.j3d.Node, int)`, Constant Field Values
  ``

### INTERSECT_COORD

    public static final int INTERSECT_COORD

  Flag to pass to `setCapabilities(Node, int)`to set the Node's capabilities to allow inquiry of the intersection coordinate information.

  See Also:
    `setCapabilities(javax.media.j3d.Node, int)`, Constant Field Values
  ``

### INTERSECT_FULL

    public static final int INTERSECT_FULL

  Flag to pass to `setCapabilities(Node, int)`to set the Node's capabilities to allow inquiry of all intersection information.

  See Also:
    `setCapabilities(javax.media.j3d.Node, int)`, Constant Field Values
  ``

Constructor Detail

### PickTool

    public PickTool(BranchGroup b)

  Constructor with BranchGroup to be picked.

### PickTool

    public PickTool(Locale l)

  Constructor with the Locale to be picked.

Method Detail

### getBranchGroup

    public BranchGroup getBranchGroup()

  Returns the BranchGroup to be picked if the tool was initialized with a BranchGroup, null otherwise.

### getLocale

    public Locale getLocale()

  Returns the Locale to be picked if the tool was initialized with a Locale, null otherwise.

### setBranchGroup

    public Locale setBranchGroup(Locale l)

  Deprecated. This method does nothing other than return its input parameter.

### setCapabilities

    public static void setCapabilities(Node node,
                                       int level)

  Sets the capabilities on the Node and it's components to allow picking at the specified detail level.

  Note that by default all com.sun.j3d.utils.geometry.Primitive objects with the same parameters share their geometry (e.g., you can have 50 spheres in your scene, but the geometry is stored only once). Therefore the capabilities of the geometry are also shared, and once a shared node is live, the capabilities cannot be changed. To assign capabilities to Primitives with the same parameters, either set the capabilities before the primitive is set live, or specify the Primitive.GEOMETRY_NOT_SHARED constructor parameter when creating the primitive.

  Parameters:
    `node` - The node to modify
    `level` - The capability level, must be one of INTERSECT_TEST, INTERSECT_COORD or INTERSECT_FULL
  Throws:
    `java.lang.IllegalArgumentException` - if Node is not a Shape3D or Morph or if the flag value is not valid.
    `RestrictedAccessException` - if the node is part of a live or compiled scene graph.

### setShape

    public void setShape(PickShape ps,
                         Point3d startPt)

  Sets the pick shape to a user-provided PickShape object

  Parameters:
    `ps` - The pick shape to pick against.
    `startPt` - The start point to use for distance calculations

### setShapeBounds

    public void setShapeBounds(Bounds bounds,
                               Point3d startPt)

  Sets the pick shape to use a user-provided Bounds object

  Parameters:
    `bounds` - The bounds to pick against.
    `startPt` - The start point to use for distance calculations

### setMode

    public void setMode(int mode)

  Sets the picking detail mode. The default is BOUNDS.

  Parameters:
    `mode` - One of BOUNDS, GEOMETRY, GEOMETRY_INTERSECT_INFO, or
  Throws:
    `java.lang.IllegalArgumentException` - if mode is not a legal value

### getMode

    public int getMode()

  Gets the picking detail mode.

### setShapeRay

    public void setShapeRay(Point3d start,
                            Vector3d dir)

  Sets the pick shape to a PickRay.

  Parameters:
    `start` - The start of the ray
    `dir` - The direction of the ray

### setShapeSegment

    public void setShapeSegment(Point3d start,
                                Point3d end)

  Sets the pick shape to a PickSegment.

  Parameters:
    `start` - The start of the segment p @param end The end of the segment

### setShapeCylinderSegment

    public void setShapeCylinderSegment(Point3d start,
                                        Point3d end,
                                        double radius)

  Sets the pick shape to a capped PickCylinder

  Parameters:
    `start` - The start of axis of the cylinder
    `end` - The end of the axis of the cylinder
    `radius` - The radius of the cylinder

### setShapeCylinderRay

    public void setShapeCylinderRay(Point3d start,
                                    Vector3d dir,
                                    double radius)

  Sets the pick shape to an infinite PickCylinder.

  Parameters:
    `start` - The start of axis of the cylinder
    `dir` - The direction of the axis of the cylinder
    `radius` - The radius of the cylinder

### setShapeConeSegment

    public void setShapeConeSegment(Point3d start,
                                    Point3d end,
                                    double angle)

  Sets the pick shape to a capped PickCone

  Parameters:
    `start` - The start of axis of the cone
    `end` - The end of the axis of the cone
    `angle` - The angle of the cone

### setShapeConeRay

    public void setShapeConeRay(Point3d start,
                                Vector3d dir,
                                double angle)

  Sets the pick shape to an infinite PickCone.

  Parameters:
    `start` - The start of axis of the cone
    `dir` - The direction of the axis of the cone
    `angle` - The angle of the cone

### getPickShape

    public PickShape getPickShape()

  Returns the PickShape for this object.

### getStartPosition

    public Point3d getStartPosition()

  Returns the start postion used for distance measurement.

### pickAll

    public PickResult[] pickAll()

  Selects all the nodes that intersect the PickShape.

  Returns:
    An array of `PickResult` objects which will contain information about the picked instances. `null` if nothing was picked.

### pickAny

    public PickResult pickAny()

  Select one of the nodes that intersect the PickShape

  Returns:
    A `PickResult` object which will contain information about the picked instance. `null` if nothing was picked.

### pickAllSorted

    public PickResult[] pickAllSorted()

  Select all the nodes that intersect the PickShape, returned sorted. The "closest" object will be returned first. See note above to see how "closest" is determined.

  Returns:
    An array of `PickResult` objects which will contain information about the picked instances. `null` if nothing was picked.

### pickClosest

    public PickResult pickClosest()

  Select the closest node that intersects the PickShape. See note above to see how "closest" is determined.

  Returns:
    A `PickResult` object which will contain information about the picked instance. `null` if nothing was picked.

Copyright 1996-2008 Sun Microsystems, Inc. All Rights Reserved. Use is subject to license terms.