javax.media.j3d

Class TexCoordGeneration

java.lang.Object

javax.media.j3d.SceneGraphObject

javax.media.j3d.NodeComponent

javax.media.j3d.TexCoordGeneration

public class TexCoordGeneration
extends NodeComponent

The TexCoordGeneration object contains all parameters needed for automatic texture coordinate generation. It is included as part of an Appearance component object.

Texture coordinates determine which texel in the texture map is assigned to a given vertex. Texture coordinates are interpolated between vertices, similarly to how colors are interpolated between two vertices of lines and polygons.

Texture coordinates consist of two, three or four coordinates. These coordinates are referred to as the S, T, R, and Q coordinates. 2D textures use the S and T coordinates. 3D textures use the S, T and R coordinates. The Q coordinate, similar to the w coordinate of the (x, y, z, w) object coordinates, is used to create homogeneous coordinates.

Rather than the programmer having to explicitly assign texture coordinates, Java 3D can automatically generate the texture coordinates to achieve texture mapping onto contours. The TexCoordGeneration attributes specify the functions for automatically generating texture coordinates. The texture attributes that can be defined are:

• Texture format - defines whether the generated texture coordinates are 2D, 3D, or 4D:
  • TEXTURE_COORDINATE_2 - generates 2D texture coordinates (S and T).

  • TEXTURE_COORDINATE_3 - generates 3D texture coordinates (S, T, and R).

  • TEXTURE_COORDINATE_4 - generates 4D texture coordinates (S, T, R, and Q).

• Texture generation mode - defines how the texture coordinates are generated:
  • OBJECT_LINEAR - texture coordinates are generated as a linear function in object coordinates. The function used is:
    g = p1xo + p2yo + p3zo + p4wo

    where
    

    g is the value computed for the coordinate.
    p1, p2, p3, and p4 are the plane equation coefficients (described below).
    x_o, y_o, z_o, and w_o are the object coordinates of the vertex.

  • EYE_LINEAR - texture coordinates are generated as a linear function in eye coordinates. The function used is:
    g = p1'xe + p2'ye + p3'ze + p4'we

    where
    

    xe, ye, ze, and w_e are the eye coordinates of the vertex.
    p1', p2', p3', and p4' are the plane equation coefficients transformed into eye coordinates.

  • SPHERE_MAP - texture coordinates are generated using spherical reflection mapping in eye coordinates. Used to simulate the reflected image of a spherical environment onto a polygon.

  • NORMAL_MAP - texture coordinates are generated to match vertices' normals in eye coordinates. This is only available if TextureCubeMap is available.
  • REFLECTION_MAP - texture coordinates are generated to match vertices' reflection vectors in eye coordinates. This is only available if TextureCubeMap is available.

• Plane equation coefficients - defines the coefficients for the plane equations used to generate the coordinates in the OBJECT_LINEAR and EYE_LINEAR texture generation modes. The coefficients define a reference plane in either object coordinates or in eye coordinates, depending on the texture generation mode.

  The equation coefficients are set by the setPlaneS, setPlaneT, setPlaneR, and setPlaneQ methods for each of the S, T, R, and Q coordinate functions, respectively. By default the equation coefficients are set as follows:

  plane S = (1.0, 0.0, 0.0, 0.0)
  plane T = (0.0, 1.0, 0.0, 0.0)
  plane R = (0.0, 0.0, 0.0, 0.0)
  plane Q = (0.0, 0.0, 0.0, 0.0)

Texture coordinate generation is enabled or disabled by the setEnable method. When enabled, the specified texture coordinate is computed according to the generating function associated with the coordinate. When disabled, subsequent vertices take the specified texture coordinate from the current set of texture coordinates.

See Also:

Canvas3D.queryProperties()

Field Summary

Fields

Modifier and Type	Field and Description
static int	ALLOW_ENABLE_READ Specifies that this TexCoordGeneration object allows reading its enable flag.
static int	ALLOW_ENABLE_WRITE Specifies that this TexCoordGeneration object allows writing its enable flag.
static int	ALLOW_FORMAT_READ Specifies that this TexCoordGeneration object allows reading its format information.
static int	ALLOW_MODE_READ Specifies that this TexCoordGeneration object allows reading its mode information.
static int	ALLOW_PLANE_READ Specifies that this TexCoordGeneration object allows reading its planeS, planeR, and planeT component information.
static int	ALLOW_PLANE_WRITE Specifies that this TexCoordGeneration object allows writing its planeS, planeR, and planeT component information.
static int	EYE_LINEAR Generates texture coordinates as a linear function in eye coordinates.
static int	NORMAL_MAP Generates texture coordinates that match vertices' normals in eye coordinates.
static int	OBJECT_LINEAR Generates texture coordinates as a linear function in object coordinates.
static int	REFLECTION_MAP Generates texture coordinates that match vertices' reflection vectors in eye coordinates.
static int	SPHERE_MAP Generates texture coordinates using a spherical reflection mapping in eye coordinates.
static int	TEXTURE_COORDINATE_2 Generates 2D texture coordinates (S and T).
static int	TEXTURE_COORDINATE_3 Generates 3D texture coordinates (S, T, and R).
static int	TEXTURE_COORDINATE_4 Generates 4D texture coordinates (S, T, R, and Q).

Constructor Summary

Constructors

Constructor and Description
TexCoordGeneration() Constructs a TexCoordGeneration object with default parameters.
TexCoordGeneration(int genMode, int format) Constructs a TexCoordGeneration object with the specified genMode and format.
TexCoordGeneration(int genMode, int format, javax.vecmath.Vector4f planeS) Constructs a TexCoordGeneration object with the specified genMode, format, and the S coordinate plane equation.
TexCoordGeneration(int genMode, int format, javax.vecmath.Vector4f planeS, javax.vecmath.Vector4f planeT) Constructs a TexCoordGeneration object with the specified genMode, format, and the S and T coordinate plane equations.
TexCoordGeneration(int genMode, int format, javax.vecmath.Vector4f planeS, javax.vecmath.Vector4f planeT, javax.vecmath.Vector4f planeR) Constructs a TexCoordGeneration object with the specified genMode, format, and the S, T, and R coordinate plane equations.
TexCoordGeneration(int genMode, int format, javax.vecmath.Vector4f planeS, javax.vecmath.Vector4f planeT, javax.vecmath.Vector4f planeR, javax.vecmath.Vector4f planeQ) Constructs a TexCoordGeneration object with the specified genMode, format, and the S, T, R, and Q coordinate plane equations.

Method Summary

Methods

Modifier and Type	Method and Description
NodeComponent	cloneNodeComponent() Deprecated. replaced with cloneNodeComponent(boolean forceDuplicate)
boolean	getEnable() Retrieves the state of the texCoordGeneration enable flag.
int	getFormat() Retrieves the current TexCoordGeneration format.
int	getGenMode() Retrieves the current TexCoordGeneration generation mode.
void	getPlaneQ(javax.vecmath.Vector4f planeQ) Retrieves a copy of the plane equation used to generate the Q coordinate.
void	getPlaneR(javax.vecmath.Vector4f planeR) Retrieves a copy of the plane equation used to generate the R coordinate.
void	getPlaneS(javax.vecmath.Vector4f planeS) Retrieves a copy of the plane equation used to generate the S coordinate.
void	getPlaneT(javax.vecmath.Vector4f planeT) Retrieves a copy of the plane equation used to generate the T coordinate.
void	setEnable(boolean state) Enables or disables texture coordinate generation for this appearance component object.
void	setFormat(int format) Sets the TexCoordGeneration format to the specified value.
void	setGenMode(int genMode) Sets the TexCoordGeneration generation mode to the specified value.
void	setPlaneQ(javax.vecmath.Vector4f planeQ) Sets the Q coordinate plane equation.
void	setPlaneR(javax.vecmath.Vector4f planeR) Sets the R coordinate plane equation.
void	setPlaneS(javax.vecmath.Vector4f planeS) Sets the S coordinate plane equation.
void	setPlaneT(javax.vecmath.Vector4f planeT) Sets the T coordinate plane equation.

Methods inherited from class javax.media.j3d.NodeComponent

cloneNodeComponent, duplicateNodeComponent, duplicateNodeComponent, getDuplicateOnCloneTree, setDuplicateOnCloneTree

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

ALLOW_ENABLE_READ

public static final int ALLOW_ENABLE_READ

Specifies that this TexCoordGeneration object allows reading its enable flag.

See Also:

Constant Field Values

ALLOW_ENABLE_WRITE

public static final int ALLOW_ENABLE_WRITE

Specifies that this TexCoordGeneration object allows writing its enable flag.

See Also:

Constant Field Values

ALLOW_FORMAT_READ

public static final int ALLOW_FORMAT_READ

Specifies that this TexCoordGeneration object allows reading its format information.

See Also:

Constant Field Values

ALLOW_MODE_READ

public static final int ALLOW_MODE_READ

Specifies that this TexCoordGeneration object allows reading its mode information.

See Also:

Constant Field Values

ALLOW_PLANE_READ

public static final int ALLOW_PLANE_READ

Specifies that this TexCoordGeneration object allows reading its planeS, planeR, and planeT component information.

See Also:

Constant Field Values

ALLOW_PLANE_WRITE

public static final int ALLOW_PLANE_WRITE

Specifies that this TexCoordGeneration object allows writing its planeS, planeR, and planeT component information.

Since:

Java 3D 1.3

See Also:

Constant Field Values

OBJECT_LINEAR

public static final int OBJECT_LINEAR

Generates texture coordinates as a linear function in object coordinates.

See Also:

setGenMode(int), Constant Field Values

EYE_LINEAR

public static final int EYE_LINEAR

Generates texture coordinates as a linear function in eye coordinates.

See Also:

setGenMode(int), Constant Field Values

SPHERE_MAP

public static final int SPHERE_MAP

Generates texture coordinates using a spherical reflection mapping in eye coordinates.

See Also:

setGenMode(int), Constant Field Values

NORMAL_MAP

public static final int NORMAL_MAP

Generates texture coordinates that match vertices' normals in eye coordinates.

Since:

Java 3D 1.3

See Also:

setGenMode(int), Canvas3D.queryProperties(), Constant Field Values

REFLECTION_MAP

public static final int REFLECTION_MAP

Generates texture coordinates that match vertices' reflection vectors in eye coordinates.

Since:

Java 3D 1.3

See Also:

setGenMode(int), Canvas3D.queryProperties(), Constant Field Values

TEXTURE_COORDINATE_2

public static final int TEXTURE_COORDINATE_2

Generates 2D texture coordinates (S and T).

See Also:

setFormat(int), Constant Field Values

TEXTURE_COORDINATE_3

public static final int TEXTURE_COORDINATE_3

Generates 3D texture coordinates (S, T, and R).

See Also:

setFormat(int), Constant Field Values

TEXTURE_COORDINATE_4

public static final int TEXTURE_COORDINATE_4

Generates 4D texture coordinates (S, T, R, and Q).

Since:

Java 3D 1.3

See Also:

setFormat(int), Constant Field Values

Constructor Detail

TexCoordGeneration

public TexCoordGeneration()

Constructs a TexCoordGeneration object with default parameters. The default values are as follows:

enable flag : true
texture generation mode : OBJECT_LINEAR
format : TEXTURE_COORDINATE_2
plane S : (1,0,0,0)
plane T : (0,1,0,0)
plane R : (0,0,0,0)
plane Q : (0,0,0,0)

TexCoordGeneration

public TexCoordGeneration(int genMode,
                  int format)

Constructs a TexCoordGeneration object with the specified genMode and format. Defaults will be used for the rest of the state variables.

Parameters:

genMode - texture generation mode, one of: OBJECT_LINEAR, EYE_LINEAR, SPHERE_MAP, NORMAL_MAP, or REFLECTION_MAP

format - texture format, one of: TEXTURE_COORDINATE_2, TEXTURE_COORDINATE_3, or TEXTURE_COORDINATE_4

See Also:

Canvas3D.queryProperties()

TexCoordGeneration

public TexCoordGeneration(int genMode,
                  int format,
                  javax.vecmath.Vector4f planeS)

Constructs a TexCoordGeneration object with the specified genMode, format, and the S coordinate plane equation. Defaults will be used for the rest of the state variables.

Parameters:

genMode - texture generation mode, one of: OBJECT_LINEAR, EYE_LINEAR, SPHERE_MAP, NORMAL_MAP, or REFLECTION_MAP

format - texture format, one of: TEXTURE_COORDINATE_2, TEXTURE_COORDINATE_3 or TEXTURE_COORDINATE_4

planeS - plane equation for the S coordinate

See Also:

Canvas3D.queryProperties()

TexCoordGeneration

public TexCoordGeneration(int genMode,
                  int format,
                  javax.vecmath.Vector4f planeS,
                  javax.vecmath.Vector4f planeT)

Constructs a TexCoordGeneration object with the specified genMode, format, and the S and T coordinate plane equations. Defaults will be used for the rest of the state variables.

Parameters:

genMode - texture generation mode, one of: OBJECT_LINEAR, EYE_LINEAR, SPHERE_MAP, NORMAL_MAP, or REFLECTION_MAP

format - texture format, one of: TEXTURE_COORDINATE_2, TEXTURE_COORDINATE_3 or TEXTURE_COORDINATE_4

planeS - plane equation for the S coordinate

planeT - plane equation for the T coordinate

See Also:

Canvas3D.queryProperties()

TexCoordGeneration

public TexCoordGeneration(int genMode,
                  int format,
                  javax.vecmath.Vector4f planeS,
                  javax.vecmath.Vector4f planeT,
                  javax.vecmath.Vector4f planeR)

Constructs a TexCoordGeneration object with the specified genMode, format, and the S, T, and R coordinate plane equations.

Parameters:

genMode - texture generation mode, one of: OBJECT_LINEAR, EYE_LINEAR, SPHERE_MAP, NORMAL_MAP, or REFLECTION_MAP

format - texture format, one of: TEXTURE_COORDINATE_2, TEXTURE_COORDINATE_3 or TEXTURE_COORDINATE_4

planeS - plane equation for the S coordinate

planeT - plane equation for the T coordinate

planeR - plane equation for the R coordinate

See Also:

Canvas3D.queryProperties()

TexCoordGeneration

public TexCoordGeneration(int genMode,
                  int format,
                  javax.vecmath.Vector4f planeS,
                  javax.vecmath.Vector4f planeT,
                  javax.vecmath.Vector4f planeR,
                  javax.vecmath.Vector4f planeQ)

Constructs a TexCoordGeneration object with the specified genMode, format, and the S, T, R, and Q coordinate plane equations.

Parameters:

genMode - texture generation mode, one of: OBJECT_LINEAR, EYE_LINEAR, SPHERE_MAP, NORMAL_MAP, or REFLECTION_MAP

format - texture format, one of: TEXTURE_COORDINATE_2, TEXTURE_COORDINATE_3 or TEXTURE_COORDINATE_4

planeS - plane equation for the S coordinate

planeT - plane equation for the T coordinate

planeR - plane equation for the R coordinate

planeQ - plane equation for the Q coordinate

Since:

Java 3D 1.3

See Also:

Canvas3D.queryProperties()

Method Detail

setEnable

public void setEnable(boolean state)

Enables or disables texture coordinate generation for this appearance component object.

Parameters:

state - true or false to enable or disable texture coordinate generation

Throws:

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

getEnable

public boolean getEnable()

Retrieves the state of the texCoordGeneration enable flag.

Returns:

true if texture coordinate generation is enabled, false if texture coordinate generation is disabled

Throws:

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

setFormat

public void setFormat(int format)

Sets the TexCoordGeneration format to the specified value.

Parameters:

format - texture format, one of: TEXTURE_COORDINATE_2, TEXTURE_COORDINATE_3 or TEXTURE_COORDINATE_4

Throws:

RestrictedAccessException - if the method is called when this object is part of live or compiled scene graph.

getFormat

public int getFormat()

Retrieves the current TexCoordGeneration format.

Returns:

the texture format

Throws:

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

setGenMode

public void setGenMode(int genMode)

Sets the TexCoordGeneration generation mode to the specified value.

Parameters:

genMode - texture generation mode, one of: OBJECT_LINEAR, EYE_LINEAR, SPHERE_MAP, NORMAL_MAP, or REFLECTION_MAP.

Throws:

RestrictedAccessException - if the method is called when this object is part of live or compiled scene graph.

IllegalArgumentException - if genMode is a value other than OBJECT_LINEAR, EYE_LINEAR, SPHERE_MAP, NORMAL_MAP, or REFLECTION_MAP.

See Also:

Canvas3D.queryProperties()

getGenMode

public int getGenMode()

Retrieves the current TexCoordGeneration generation mode.

Returns:

the texture generation mode

Throws:

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

setPlaneS

public void setPlaneS(javax.vecmath.Vector4f planeS)

Sets the S coordinate plane equation. This plane equation is used to generate the S coordinate in OBJECT_LINEAR and EYE_LINEAR texture generation modes.

Parameters:

planeS - plane equation for the S coordinate

Throws:

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

getPlaneS

public void getPlaneS(javax.vecmath.Vector4f planeS)

Retrieves a copy of the plane equation used to generate the S coordinate.

Parameters:

planeS - the S coordinate plane equation

Throws:

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

setPlaneT

public void setPlaneT(javax.vecmath.Vector4f planeT)

Sets the T coordinate plane equation. This plane equation is used to generate the T coordinate in OBJECT_LINEAR and EYE_LINEAR texture generation modes.

Parameters:

planeT - plane equation for the T coordinate

Throws:

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

getPlaneT

public void getPlaneT(javax.vecmath.Vector4f planeT)

Retrieves a copy of the plane equation used to generate the T coordinate.

Parameters:

planeT - the T coordinate plane equation

Throws:

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

setPlaneR

public void setPlaneR(javax.vecmath.Vector4f planeR)

Sets the R coordinate plane equation. This plane equation is used to generate the R coordinate in OBJECT_LINEAR and EYE_LINEAR texture generation modes.

Parameters:

planeR - plane equation for the R coordinate

Throws:

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

getPlaneR

public void getPlaneR(javax.vecmath.Vector4f planeR)

Retrieves a copy of the plane equation used to generate the R coordinate.

Parameters:

planeR - the R coordinate plane equation

Throws:

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

setPlaneQ

public void setPlaneQ(javax.vecmath.Vector4f planeQ)

Sets the Q coordinate plane equation. This plane equation is used to generate the Q coordinate in OBJECT_LINEAR and EYE_LINEAR texture generation modes.

Parameters:

planeQ - plane equation for the Q coordinate

Throws:

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

Since:

Java 3D 1.3

getPlaneQ

public void getPlaneQ(javax.vecmath.Vector4f planeQ)

Retrieves a copy of the plane equation used to generate the Q coordinate.

Parameters:

planeQ - the Q coordinate plane equation

Throws:

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

Since:

Java 3D 1.3

cloneNodeComponent

public NodeComponent cloneNodeComponent()

Deprecated. replaced with cloneNodeComponent(boolean forceDuplicate)

Overrides:

cloneNodeComponent in class NodeComponent