Package 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 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 Details

    • GENERATE_NORMALS

      public static final int GENERATE_NORMALS
      Specifies that normals are generated along with the positions.
      See Also:

    • GENERATE_TEXTURE_COORDS

      public static final int GENERATE_TEXTURE_COORDS
      Specifies that texture coordinates are generated along with the positions.
      See Also:

    • GENERATE_NORMALS_INWARD

      public static final int GENERATE_NORMALS_INWARD
      Specifies that normals are to be flipped along the surface.
      See Also:

    • 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:

    • 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:

    • 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:

    • 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:

  • Constructor Details

    • Primitive

      public Primitive()
      Constructs a default primitive.

  • Method Details

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

    • getAppearance

      public abstract 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, Appearance ap)
      Sets the appearance of a subpart given a partid.

    • setAppearance

      public abstract void setAppearance(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