Class for indexed texture color map More...

#include <Inventor/nodes/SoColorMap.h>

Inheritance diagram for SoColorMap:

Public Types
enum	ColorMapFormat { LUMINANCE , ALPHA , LUMINANCE_ALPHA , RGB , RGB_ALPHA }
	Color map format. More...

enum	PredefinedColorMap { NONE , GRAY , TEMPERATURE , PHYSICS , STANDARD , GLOW , BLUE_RED , SEISMIC , BLUE_WHITE_RED , INTENSITY , LABEL_256 , VOLREN_RED , VOLREN_GREEN , AIRWAY , AIRWAY_SURFACES , INTENSITY_REVERSED }
	Predefined color map. More...

enum	Interpolation { NEAREST , LINEAR }
	The colormap interpolation type. More...

Public Member Functions
virtual SoType	getTypeId () const
	Returns the type identifier for this specific instance.

	SoColorMap ()
	Constructor.

unsigned int	getNumColor () const
	This convenience method returns the number of colors in the color map (ie: colorMap.getNum()/Number of components or 256 if a predefined color map is used)

SbBool	hasTransparency () const
	Returns TRUE if the current color map contains alpha values less than 1.

Public Member Functions inherited from SoNode
virtual void	setOverride (const SbBool state)
	Turns the override flag on or off.

virtual SbBool	isOverride () const
	Returns the state of the override flag.

virtual SoNode *	copy (SbBool copyConnections=FALSE) const
	Creates and returns an exact copy of the node.

virtual SbBool	affectsState () const
	Returns TRUE if a node has an effect on the state during traversal.

virtual void	touch ()
	Marks an instance as modified, simulating a change to it.

Public Member Functions inherited from SoFieldContainer
void	setToDefaults ()
	Sets all fields in this object to their default values.

SbBool	hasDefaultValues () const
	Returns TRUE if all of the object's fields have their default values.

SbBool	fieldsAreEqual (const SoFieldContainer *fc) const
	Returns TRUE if this object's fields are exactly equal to fc's fields.

void	copyFieldValues (const SoFieldContainer *fc, SbBool copyConnections=FALSE)
	Copies the contents of fc's fields into this object's fields.

SoNONUNICODE SbBool	set (const char *fieldDataString)
	Sets one or more fields in this object to the values specified in the given string, which should be a string in the Open Inventor file format.

SbBool	set (const SbString &fieldDataString)
	Sets one or more fields in this object to the values specified in the given string, which should be a string in the Open Inventor file format.

void	get (SbString &fieldDataString)
	Returns the values of the fields of this object in the Open Inventor ASCII file format in the given string.

virtual int	getFields (SoFieldList &list) const
	Appends references to all of this object's fields to resultList, and returns the number of fields appended.

virtual int	getAllFields (SoFieldList &list) const
	Returns a list of fields, including the eventIn's and eventOut's.

virtual SoField *	getField (const SbName &fieldName) const
	Returns a the field of this object whose name is fieldName.

virtual SoField *	getEventIn (const SbName &fieldName) const
	Returns a the eventIn with the given name.

virtual SoField *	getEventOut (const SbName &fieldName) const
	Returns the eventOut with the given name.

SbBool	getFieldName (const SoField *field, SbName &fieldName) const
	Returns the name of the given field in the fieldName argument.

SbBool	enableNotify (SbBool flag)
	Notification at this Field Container is enabled (if flag == TRUE) or disabled (if flag == FALSE).

SbBool	isNotifyEnabled () const
	Notification is the process of telling interested objects that this object has changed.

virtual void	setUserData (void *data)
	Sets application data.

void *	getUserData (void) const
	Gets user application data.

Public Member Functions inherited from SoBase
virtual SbName	getName () const
	Returns the name of an instance.

virtual void	setName (const SbName &name)
	Sets the name of an instance.

void	setSynchronizable (const bool b)
	Sets this to be a ScaleViz synchronizable object.

bool	isSynchronizable () const
	Gets the ScaleViz synchronizable state of this object.

Public Member Functions inherited from SoRefCounter
void	ref () const
	Adds a reference to an instance.

void	unref () const
	Removes a reference from an instance.

void	unrefNoDelete () const
	unrefNoDelete() should be called when it is desired to decrement the reference count, but not delete the instance if this brings the reference count to zero.

int	getRefCount () const
	Returns current reference count.

void	lock () const
	lock this instance.

void	unlock () const
	unlock this instance.

Public Member Functions inherited from SoTypedObject
SbBool	isOfType (const SoType &type) const
	Returns TRUE if this object is of the type specified in type or is derived from that type.

template<typename TypedObjectClass >
SbBool	isOfType () const
	Returns TRUE if this object is of the type of class TypedObjectClass or is derived from that class.

Static Public Member Functions
static SoType	getClassTypeId ()
	Returns the type identifier for this class.

Static Public Member Functions inherited from SoNode
static SoType	getClassTypeId ()
	Returns the type identifier for this class.

static SoNode *	getByName (const SbName &name)
	A node's name can be set using SoBase::setName().

static int	getByName (const SbName &name, SoNodeList &list)
	A node's name can be set using SoBase::setName().

Static Public Member Functions inherited from SoFieldContainer
static SoType	getClassTypeId ()
	Returns the type of this class.

Static Public Member Functions inherited from SoBase
static SoType	getClassTypeId ()
	Returns type identifier for this class.

Static Public Member Functions inherited from SoTypedObject
static SoType	getClassTypeId ()
	Returns the type identifier for this class.

Public Attributes
SoSFFloat	min
	This field allow to remap the color map such that only data values ranging from min to max will be mapped to the color map.

SoSFFloat	max
	See min.

SoSFEnum	predefinedColorMap
	Use this field to load predefined color maps.

SoSFEnum	colorMapFormat
	Indicates the format of the color map (number of color components).

SoMFFloat	colorMap
	Array of floats in range [0,1].

SoSFEnum	interpolation
	The colormap interpolation type.

Detailed Description

Class for indexed texture color map

This class describes the association between values of the SoIndexedTexture2 node and colors.

The data value coming from the SoIndexedTexture2 node is used as an index into the color map defined by the colorMap field or the predefinedColorMap field.

The predefinedColorMap field allows you to specify a predefined color map or using value NONE, that the color map is contained in the colorMap field.

The min and max fields define the range of the data values that will actually be used. The color map is modified such that only data values ranging from min to max will be mapped to the color map. The figure below illustrates the effects of these fields:

br

The SoColorMap node acts like an SoShaderProgram with an SoFragmentShader. Standard Open Inventor operations on textures will be disabled on all subsequent nodes, thus using an SoTexture2 node or multitexturing after this node will not give the expected result.

NOTE:

The SoColorMap node must be inserted before the SoIndexedTexture2.
This node puts the color map in the next available texture unit, so this unit must not be used for any other purpose in your application. On hardware which doesn't support ARB_fragment_program but supports EXT_paletted_texture , the next available texture unit is not used and thus remains available for use by the application.
If your graphics hardware does not support the ARB_fragment_program or the EXT_paletted_texture OpenGL extension, this node has no effect.
SoColorMap is intended to be used with a SoIndexedTexture2 node. However, without an SoIndexedTexture2 node, the color map will still be applied on the geometry, but without indexation. To specify a color map for volume rendering, see SoTransferFunction.

EXAMPLE

SoColorMap *colorMap = new SoColorMap();
  colorMap->predefinedColorMap = SoColorMap::TEMPERATURE;  
  colorMap->min.setValue( -1000 );        
  colorMap->max.setValue( 20000 );        
SoIndexedTexture2 *indexedTexture = new SoIndexedTexture2();
  indexedTexture->imageIndex.setValue(size, SoSFArray2D::SIGNED_SHORT, data); 
root->addChild( colorMap );
root->addChild( indexedTexture );
root->addChild( geometry );

FILE FORMAT/DEFAULT

min	0
max	0
predefinedColorMap	TEMPERATURE
colorMapFormat	RGB_ALPHA
colorMap	0

ACTION BEHAVIOR

SoGLRenderAction

SoCallbackAction

SoColorMapElement

Member Enumeration Documentation

◆ ColorMapFormat

enum SoColorMap::ColorMapFormat

Color map format.

Enumerator
LUMINANCE	(1 float)
ALPHA	(1 float)
LUMINANCE_ALPHA	(2 floats)
RGB	(3 floats)
RGB_ALPHA	(4 floats)

Definition at line 148 of file SoColorMap.h.

◆ Interpolation

enum SoColorMap::Interpolation

The colormap interpolation type.

These types determine the method used for color map texture filtering.

Enumerator
NEAREST	Nearest-neighbor interpolation.
LINEAR	Linear interpolation.

Definition at line 289 of file SoColorMap.h.

◆ PredefinedColorMap

enum SoColorMap::PredefinedColorMap

Predefined color map.

Enumerator
NONE	None.
GRAY	Gray (Default)
TEMPERATURE	Temperature.
PHYSICS	Physics.
STANDARD	Standard.
GLOW	Glow.
BLUE_RED	Blue red.
SEISMIC	Seismic.
BLUE_WHITE_RED	Blue white red.
INTENSITY	Intensity.
LABEL_256	256 labels
VOLREN_RED	VolRenRed.
VOLREN_GREEN	VolRenGreen.
AIRWAY	Airway.
AIRWAY_SURFACES	Airway surfaces.
INTENSITY_REVERSED	Intensity reversed.

Definition at line 165 of file SoColorMap.h.

Constructor & Destructor Documentation

◆ SoColorMap()

SoColorMap::SoColorMap ( )

Constructor.

Member Function Documentation

◆ getClassTypeId()

static SoType SoColorMap::getClassTypeId ( )

static

Returns the type identifier for this class.

◆ getNumColor()

unsigned int SoColorMap::getNumColor ( ) const

This convenience method returns the number of colors in the color map (ie: colorMap.getNum()/Number of components or 256 if a predefined color map is used)

◆ getTypeId()

virtual SoType SoColorMap::getTypeId ( ) const

virtual

Returns the type identifier for this specific instance.

Reimplemented from SoNode.

◆ hasTransparency()

SbBool SoColorMap::hasTransparency ( ) const

Returns TRUE if the current color map contains alpha values less than 1.

FALSE means the color map is completely opaque.

Member Data Documentation

◆ colorMap

SoMFFloat SoColorMap::colorMap

Array of floats in range [0,1].

The number of floats depends on colorMapFormat. It is equal to the number of colors defined multiplied by the number of components per color. For example, for an RGBA color map of length n, there should be 4*n float values in the field. If a predefined color map is specified, the values of this field are not used.

Definition at line 283 of file SoColorMap.h.

◆ colorMapFormat

SoSFEnum SoColorMap::colorMapFormat

Indicates the format of the color map (number of color components).

Use enum ColorMapFormat. Default is RGB_ALPHA.

LUMINANCE means one component per color for a grayscale color map.

ALPHA means one alpha component per color.

LUMINANCE_ALPHA means two components per color, luminance and alpha. In such a case the colorMap float array contains a list of two floats. Index 0 is luminance, index 1 is alpha, index 2 is luminance, index 3 is alpha and so on.

RGB means three components per color, ordered red first, then green and blue.

RGB_ALPHA means four components per color, ordered red first, then green, blue, and alpha.

An alpha value equal to zero means "fully transparent", an alpha value equal to one means "opaque".

Definition at line 274 of file SoColorMap.h.

◆ interpolation

SoSFEnum SoColorMap::interpolation

The colormap interpolation type.

These types determine the method used for color map texture filtering. Use enum Interpolation. Default is NEAREST.

NOTE: field available since Open Inventor 9.4.2

Definition at line 305 of file SoColorMap.h.

◆ max

SoSFFloat SoColorMap::max

See min.

Definition at line 223 of file SoColorMap.h.

◆ min

SoSFFloat SoColorMap::min

This field allow to remap the color map such that only data values ranging from min to max will be mapped to the color map.

min and max must be between minValue and maxValue of the corresponding SoIndexedTexture2 node.

Values less than min and greater than max will be set to colorMap[0] and colorMap[colorMap.getNum()-1] respectively. If min is less than the minimum of the indexed texture minValue , it will be clamped to this minimum. If max is greater than the maximum of the indexed texture maxValue , it will be clamped to this maximum. When min and max are equal to 0 (the default), the entire range of data values is used.

Setting (min,max) to (64,192) while the predefined STANDARD color map is selected and in the case of a UNSIGNED_BYTE indexed texture will make the color map as shown: