Per-instance parameter node storing a buffer object. More...

#include <Inventor/nodes/SoInstanceParameter.h>

Inheritance diagram for SoInstanceParameter:

Public Types
enum	PredefinedParameters { TRANSLATION = 0 , ROTATION , SCALE , VISIBILITY , COLOR , TRANSPARENCY , NUM_PREDEFINED_PARAMETERS }
	List of predefined per-instance attribute names. More...

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

	SoInstanceParameter ()
	Constructor.

void	setPredefinedParameterName (SoInstanceParameter::PredefinedParameters paramKey)
	Sets the name field to the string corresponding to the given paramKey.

Public Member Functions inherited from SoVertexShaderParameterBufferObject
	SoVertexShaderParameterBufferObject ()
	Constructor.

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 SoInstanceParameter *	createPredefinedParameter (SoInstanceParameter::PredefinedParameters paramKey, const SoBufferObject *values, uint32_t divisor=1)
	Creates an instance parameter object for one of the predefined attribute names.

static SbString	getPredefinedParameterName (SoInstanceParameter::PredefinedParameters paramKey)
	Returns the predefined instance parameter name for the specified paramKey.

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

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

Static Public Member Functions inherited from SoShaderParameter
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
SoSFUInt32	divisor
	This field modifies the rate at which values advance during multiple instance rendering.

Public Attributes inherited from SoVertexShaderParameterBufferObject
SoSFBufferObject	value
	Specifies the parameter's values.

SoSFInt32	components
	Specifies the number of components per generic vertex parameter.

SoSFEnum	type
	Specifies the data type from the class SbDataType of each generic vertex parameter component.

SoSFInt32	offset
	Offset in bytes to the first parameter within the buffer.

SoSFInt32	stride
	Specifies the byte offset between consecutive generic vertex parameter.

SoSFBool	shouldBeNormalized
	Specifies if the fixed-point data in the buffer object should be normalized when they are accessed.

Public Attributes inherited from SoShaderParameter
SoSFString	name
	Specifies the parameter's string name which is declared and used within high-level shading programs.

SoSFInt32	identifier
	Specifies the parameter's integer name which is declared and used within low-level shading programs.

Detailed Description

Per-instance parameter node storing a buffer object.

This node allows the application to provide a per-instance parameter of any type, using an SoBufferObject. It is used with the SoMultipleInstance node.

Some predefined parameter names can be used for common instance parameters like position, rotation and scale factor. Parameter objects with these names are automatically managed and are recognized and used by the default shaders. Applications can define additional parameter objects to be used by custom shaders.

See the base classes SoShaderParameter, SoVertexShaderParameter and SoVertexShaderParameterBufferObject for more details.

Note: Unlike SoVertexShaderParameter, instances of this node must be added to the parameters field of an SoMultipleInstance node, not directly in the scene graph.

FILE FORMAT/DEFAULT

name	""
identifier	0
value	NULL
components	4
type	SbDataType::FLOAT
stride	0
shouldBeNormalized	FALSE
divisor	1

Member Enumeration Documentation

◆ PredefinedParameters

enum SoInstanceParameter::PredefinedParameters

List of predefined per-instance attribute names.

The names corresponding to the following enum symbols can be queried by mean of the getPredefinedParameterName() method. They correspond to a set of predefined parameter names that are automatically managed/interpreted:

OivShapeInstanceTranslation: Handles an array of vec3f translation to apply to vertices of each instance.
OivShapeInstanceScale: Handles an array of vec3f scale factor applied to vertices of each instance.
OivShapeInstanceRotation: Handles an array of vec4f quaternion applied to vertices of each instance.
OivShapeInstanceColor: Handles an array of vec3f color applied to vertices of each instance.
OivShapeInstanceTransparency: Handles an array of float transparency applied to vertices of each instance.
OivShapeInstanceVisibility: Handles an array of int32 visibility flag to apply to each instance.

OivShapeInstanceTranslation, OivShapeInstanceScale and OivShapeInstanceRotation are combined together to create an equivalent matrix available in GLSL shaders with the function

mat4 OivInstanceMatrix()

OivInstanceMatrix

mat4 OivInstanceMatrix()

Get the transformation matrix to apply to the current geometry instance, i.e., the combination of ins...

If no parameters are present then an identity matrix is returned.

OivShapeInstanceColor and OivShapeInstanceTransparency affect, respectively, the diffuse color and the transparency of each instance. Note that when one of these parameters is defined, it overrides the diffuse color or the transparency value of a SoMaterial node.

OivShapeInstanceVisibility affects the visibility of each instance (i.e. 0 means hidden and a value greater than zero means visible). This attribute is available in GLSL shaders with the function

int OivInstanceVisibility()

.

Enumerator
TRANSLATION
ROTATION
SCALE
VISIBILITY
COLOR
TRANSPARENCY
NUM_PREDEFINED_PARAMETERS

Definition at line 136 of file SoInstanceParameter.h.

Constructor & Destructor Documentation

◆ SoInstanceParameter()

SoInstanceParameter::SoInstanceParameter ( )

Constructor.

Member Function Documentation

◆ createPredefinedParameter()

static SoInstanceParameter * SoInstanceParameter::createPredefinedParameter	(	SoInstanceParameter::PredefinedParameters	paramKey,
		const SoBufferObject *	values,
		uint32_t	divisor = `1`
	)

static

Creates an instance parameter object for one of the predefined attribute names.

paramKey = TRANSLATION:
Sets the translation per instance parameter values using the specified SoBufferObject. The SoBufferObject is expected to contain translations encoded as 3 float values, e.g. array of SbVec3f. The buffer size must be at least (numInstances/divisor) * 3 * sizeof(float). The divisor parameter indicates by how many instances a translation value is shared.

Example :

numInstance = 4
translationValues = {(1, 0, 0), (0, 1, 0)}
divisor = 2 => The first 2 instances will be translated by using (1, 0, 0) and the next two using (0, 1, 0).

paramKey = ROTATION:
Sets the rotation per instance parameter values using the specified SoBufferObject. The SoBufferObject is expected to contain rotations encoded as 4 float values, e.g. array of SbRotation. The buffer size must be at least (numInstances/divisor) * 4 * sizeof(float). The divisor parameter indicates by how many instances a rotation value is shared.

paramKey = SCALE:
Sets the scaling per instance parameter values using the specified SoBufferObject. The SoBufferObject is expected to contain scaling factor encoded as 3 float values, e.g. array of SbVec3f. The buffer size must be at least (numInstances/divisor) * 3 * sizeof(float). The divisor parameter indicates by how many instances a scale value is shared.

paramKey = COLOR:
Sets the color per instance parameter values using the specified SoBufferObject. The SoBufferObject is expected to contain colors encoded as 3 float values, e.g. array of SbColor. The buffer size must be at least (numInstances/divisor) * 3 * sizeof(float). The divisor parameter indicates by how many instances a color value is shared.

paramKey = TRANSPARENCY:
Sets the transparency per instance parameter values using the specified SoBufferObject. The SoBufferObject is expected to contain colors encoded as 1 float value, e.g. array of float. The buffer size must be at least (numInstances/divisor) * sizeof(float). The divisor parameter indicates by how many instances a transparency value is shared.

paramKey = VISIBILITY:
Sets the visibility per instance parameter values using the specified SoBufferObject. The SoBufferObject is expected to contain visibility value encoded as an int32_t value. The buffer size must be at least (numInstances/divisor) * sizeof(int32_t). The divisor parameter indicates by how many instances a visibility value is shared.

◆ getClassTypeId()

static SoType SoInstanceParameter::getClassTypeId ( )

static

Returns the type identifier for this class.

◆ getPredefinedParameterName()

static SbString SoInstanceParameter::getPredefinedParameterName ( SoInstanceParameter::PredefinedParameters paramKey )

static

Returns the predefined instance parameter name for the specified paramKey.

◆ getTypeId()

virtual SoType SoInstanceParameter::getTypeId ( ) const

virtual

Returns the type identifier for this specific instance.

Reimplemented from SoVertexShaderParameterBufferObject.

◆ setPredefinedParameterName()

void SoInstanceParameter::setPredefinedParameterName ( SoInstanceParameter::PredefinedParameters paramKey )

Sets the name field to the string corresponding to the given paramKey.

Member Data Documentation

◆ divisor

SoSFUInt32 SoInstanceParameter::divisor

This field modifies the rate at which values advance during multiple instance rendering.

Divisor must be non-zero and the attribute advances once per divisor instances of the set(s) of vertices being rendered. Default is 1 (1 parameter per instance).

Definition at line 96 of file SoInstanceParameter.h.

The documentation for this class was generated from the following file:

Inventor/nodes/SoInstanceParameter.h

Open Inventor Release 2024.1.3

Public Types

Public Member Functions

Static Public Member Functions

Public Attributes

Detailed Description

FILE FORMAT/DEFAULT

SEE ALSO

Member Enumeration Documentation

◆ PredefinedParameters

Constructor & Destructor Documentation

◆ SoInstanceParameter()

Member Function Documentation

◆ createPredefinedParameter()

◆ getClassTypeId()

◆ getPredefinedParameterName()

◆ getTypeId()

◆ setPredefinedParameterName()

Member Data Documentation

◆ divisor