com.sun.j3d.utils.geometry

Class Primitive

java.lang.Object

javax.media.j3d.SceneGraphObject

javax.media.j3d.Node

javax.media.j3d.Group

com.sun.j3d.utils.geometry.Primitive

Direct Known Subclasses:

Box, Cone, Cylinder, Sphere

public abstract class Primitive
extends javax.media.j3d.Group

Base class for all Java 3D primitives. By default all primitives with the same parameters share their geometry (e.g., you can have 50 shperes in your scene, but the geometry is stored only once). A change to one primitive will effect all shared nodes. Another implication of this implementation is that the capabilities of the geometry are shared, and once one of the shared nodes is live, the capabilities cannot be set. Use the GEOMETRY_NOT_SHARED flag if you do not wish to share geometry among primitives with the same parameters.

Field Summary

Fields

Modifier and Type	Field and Description
static int	ENABLE_APPEARANCE_MODIFY Specifies that the ALLOW_APPEARANCE_READ and ALLOW_APPEARANCE_WRITE bits are to be set on the generated geometry's Shape3D nodes.
static int	ENABLE_GEOMETRY_PICKING Specifies that the ALLOW_INTERSECT capability bit should be set on the generated geometry.
static int	GENERATE_NORMALS Specifies that normals are generated along with the positions.
static int	GENERATE_NORMALS_INWARD Specifies that normals are to be flipped along the surface.
static int	GENERATE_TEXTURE_COORDS Specifies that texture coordinates are generated along with the positions.
static int	GENERATE_TEXTURE_COORDS_Y_UP Specifies that texture coordinates are to be Y up.
static int	GEOMETRY_NOT_SHARED Specifies that the geometry being created will not be shared by another scene graph node.

Fields inherited from class javax.media.j3d.Group

ALLOW_CHILDREN_EXTEND, ALLOW_CHILDREN_READ, ALLOW_CHILDREN_WRITE, ALLOW_COLLISION_BOUNDS_READ, ALLOW_COLLISION_BOUNDS_WRITE

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_LOCALE_READ, ALLOW_PARENT_READ, ALLOW_PICKABLE_READ, ALLOW_PICKABLE_WRITE, ENABLE_COLLISION_REPORTING, ENABLE_PICK_REPORTING

Constructor Summary

Constructors

Constructor and Description
Primitive() Constructs a default primitive.

Method Summary

Methods

Modifier and Type	Method and Description
protected void	cacheGeometry(int kind, float a, float b, float c, int d, int e, int flags, com.sun.j3d.utils.geometry.GeomBuffer geo)
static void	clearGeometryCache() Clear the shared geometry cache for all Primitive types.
javax.media.j3d.Appearance	getAppearance() Gets the appearance of the primitive (defaults to first subpart).
abstract javax.media.j3d.Appearance	getAppearance(int partId) Gets the appearance of the specified part of the primitive.
protected com.sun.j3d.utils.geometry.GeomBuffer	getCachedGeometry(int kind, float a, float b, float c, int d, int e, int flags)
int	getNumTriangles() Returns the total number of triangles in this primitive.
int	getNumVertices() Returns the total number of vertices in this primitive.
int	getPrimitiveFlags() Returns the flags of primitive (generate normal, textures, caching, etc).
abstract javax.media.j3d.Shape3D	getShape(int partid) Obtains a shape node of a subpart of the primitive.
void	setAppearance() Sets the main appearance of the primitive (all subparts) to a default white appearance.
abstract void	setAppearance(javax.media.j3d.Appearance ap) Sets the main appearance of the primitive (all subparts) to same appearance.
void	setAppearance(int partid, javax.media.j3d.Appearance ap) Sets the appearance of a subpart given a partid.
void	setNumTriangles(int num) Deprecated. The number of triangles is an immutable attribute.
void	setNumVertices(int num) Deprecated. The number of vertices is an immutable attribute.
void	setPrimitiveFlags(int fl) Deprecated. The primitive flags must be set at construction time via one of the subclass constructors.

Methods inherited from class javax.media.j3d.Group

addChild, cloneNode, getAllChildren, getAlternateCollisionTarget, getChild, getCollisionBounds, indexOfChild, insertChild, moveTo, numChildren, removeAllChildren, removeChild, removeChild, setAlternateCollisionTarget, setChild, setCollisionBounds

Methods inherited from class javax.media.j3d.Node

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

Methods inherited from class javax.media.j3d.SceneGraphObject

clearCapability, clearCapabilityIsFrequent, duplicateSceneGraphObject, getCapability, getCapabilityIsFrequent, getName, getUserData, isCompiled, isLive, setCapability, setCapabilityIsFrequent, setName, setUserData, toString, updateNodeReferences

Methods inherited from class java.lang.Object

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

Field Detail

GENERATE_NORMALS

public static final int GENERATE_NORMALS

Specifies that normals are generated along with the positions.

See Also:

Constant Field Values

GENERATE_TEXTURE_COORDS

public static final int GENERATE_TEXTURE_COORDS

Specifies that texture coordinates are generated along with the positions.

See Also:

Constant Field Values

GENERATE_NORMALS_INWARD

public static final int GENERATE_NORMALS_INWARD

Specifies that normals are to be flipped along the surface.

See Also:

Constant Field Values

GENERATE_TEXTURE_COORDS_Y_UP

public static final int GENERATE_TEXTURE_COORDS_Y_UP

Specifies that texture coordinates are to be Y up.

Since:

Java 3D 1.5.1

See Also:

Constant Field Values

GEOMETRY_NOT_SHARED

public static final int GEOMETRY_NOT_SHARED

Specifies that the geometry being created will not be shared by another scene graph node. By default all primitives created with the same parameters share their geometry (e.g., you can have 50 spheres in your scene, but the geometry is stored only once). A change to one primitive will effect all shared nodes. You specify this flag if you do not wish to share any geometry among primitives of the same parameters.

See Also:

Constant Field Values

ENABLE_GEOMETRY_PICKING

public static final int ENABLE_GEOMETRY_PICKING

Specifies that the ALLOW_INTERSECT capability bit should be set on the generated geometry. This allows the object to be picked using Geometry based picking.

See Also:

Constant Field Values

ENABLE_APPEARANCE_MODIFY

public static final int ENABLE_APPEARANCE_MODIFY

Specifies that the ALLOW_APPEARANCE_READ and ALLOW_APPEARANCE_WRITE bits are to be set on the generated geometry's Shape3D nodes.

See Also:

Constant Field Values

Constructor Detail

Primitive

public Primitive()

Constructs a default primitive.

Method Detail

getNumTriangles

public int getNumTriangles()

Returns the total number of triangles in this primitive.

Returns:

the total number of triangles in this primitive

setNumTriangles

public void setNumTriangles(int num)

Deprecated. The number of triangles is an immutable attribute.

getNumVertices

public int getNumVertices()

Returns the total number of vertices in this primitive.

Returns:

the total number of vertices in this primitive

setNumVertices

public void setNumVertices(int num)

Deprecated. The number of vertices is an immutable attribute.

getPrimitiveFlags

public int getPrimitiveFlags()

Returns the flags of primitive (generate normal, textures, caching, etc).

setPrimitiveFlags

public void setPrimitiveFlags(int fl)

Deprecated. The primitive flags must be set at construction time via one of the subclass constructors.

getShape

public abstract javax.media.j3d.Shape3D getShape(int partid)

Obtains a shape node of a subpart of the primitive.

Parameters:

partid - identifier for a given subpart of the primitive.

getAppearance

public javax.media.j3d.Appearance getAppearance()

Gets the appearance of the primitive (defaults to first subpart).

getAppearance

public abstract javax.media.j3d.Appearance getAppearance(int partId)

Gets the appearance of the specified part of the primitive.

Parameters:

partId - identifier for a given subpart of the primitive

Returns:

The appearance object associated with the partID. If an invalid partId is passed in, null is returned.

Since:

Java 3D 1.2.1

setAppearance

public void setAppearance(int partid,
                 javax.media.j3d.Appearance ap)

Sets the appearance of a subpart given a partid.

setAppearance

public abstract void setAppearance(javax.media.j3d.Appearance ap)

Sets the main appearance of the primitive (all subparts) to same appearance.

setAppearance

public void setAppearance()

Sets the main appearance of the primitive (all subparts) to a default white appearance.

cacheGeometry

protected void cacheGeometry(int kind,
                 float a,
                 float b,
                 float c,
                 int d,
                 int e,
                 int flags,
                 com.sun.j3d.utils.geometry.GeomBuffer geo)

getCachedGeometry

protected com.sun.j3d.utils.geometry.GeomBuffer getCachedGeometry(int kind,
                                                      float a,
                                                      float b,
                                                      float c,
                                                      int d,
                                                      int e,
                                                      int flags)

clearGeometryCache

public static void clearGeometryCache()

Clear the shared geometry cache for all Primitive types. Existing Shapes with shared geometry will continue to share the geometry. New Primitives will create new shared geometry.

Since:

Java 3D 1.3.2