Global environment node. More...

#include <Inventor/nodes/SoEnvironment.h>

Inheritance diagram for SoEnvironment:

Public Types
enum	FogType { NONE , HAZE , FOG , SMOKE }
	Type of fog. More...

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

	SoEnvironment ()
	Creates an environment node with default settings.

virtual void	setOverride (const SbBool state)
	Sets the state of the overridden field.

virtual SbBool	isOverride () const
	Returns the state of the overridden field.

Public Member Functions inherited from SoNode
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	ambientIntensity
	Intensity of ambient light (for Phong lighting).

SoSFColor	ambientColor
	RGB color of ambient lighting (for Phong lighting).

SoSFVec3f	attenuation
	Squared, linear, and constant light attenuation coefficients (in that order).

SoSFBool	ambientOcclusion
	If set to TRUE, ambient occlusion is activated.

SoSFFloat	ambientOcclusionIntensity
	Intensity of ambient occlusion: the higher the value, the darker the scene.

SoSFFloat	ambientOcclusionRadius
	Specifies the radius of the "sphere" (in world space) beyond which the ambient occlusion has no more effect.

SoSFEnum	fogType
	Type of fog.

SoSFColor	fogColor
	Fog color.

SoSFFloat	fogStart
	Distance at which the linear fog HAZE starts to be applied.

SoSFFloat	fogVisibility
	Fog visibility distance, which is the distance at which fog totally obscures objects.

Detailed Description

Global environment node.

This node describes global environmental attributes such as ambient lighting, light attenuation, ambient occlusion and fog.

Ambient light (ambientIntensity and ambientColor) is the amount of global light impinging on each surface point when the lighting model is Phong (see SoLightModel). The ambient light values effectively specify a minimum brightness for all shapes. Even if no light source is directly shining on a surface, the ambient component will light up the surface a little bit to prevent it from being pure black.

Light attenuation (attenuation) is the loss of light intensity over distance. The greater the distance from the light source, the lower the intensity. Attenuation affects all subsequent Point and Spot lights in a scene (see SoLight). See attenuation field for more details.

Ambient occlusion (ambientOcclusion) is a rendering effect that simulates how much of the global ambient light can reach different parts of a shape. Parts that are less exposed to the ambient light, i.e. more occluded, will appear darker. This effect is very useful to better discern the shapes of objects. The ambientOcclusion field controls this effect for shape nodes other than SoVolumeRendering and point sets. (although point sets can "generate" ambient occlusion). SoVolumeRendering also supports ambient occlusion, but it must be enabled using an SoVolumeRenderingQuality node.
Ambient occlusion limitations:

Important performance penalty can be experienced on Intel HD and UHD Graphics integrated GPU

No Ambient Occlusion

Ambient Occlusion

Example with a lineset extracted from a DTI

Fog has one of four types, each of which blends each surface point with the specified fog color (usually set equal to the rendering window background color). Each type interprets the fogVisibility field to be the distance at which fog totally obscures objects. A fogVisibility value of 0 (the default) causes the SoEnvironment node to set up fog so that the visibility is the distance to the far clipping plane of the current camera. Using a fog of type HAZE results in a linear fog between the fogStart value and the fogVisibility value.

FILE FORMAT/DEFAULT

ambientIntensity	0.2
ambientColor	1 1 1
attenuation	0 0 1
ambientOcclusion	FALSE
ambientOcclusionIntensity	1.0
ambientOcclusionRadius	4.0
fogType	NONE
fogColor	1 1 1
fogStart	0
fogVisibility	0

ACTION BEHAVIOR

SoGLRenderAction

SoEnvironmentElement

SoLightAttenuationElement

Member Enumeration Documentation

◆ FogType

enum SoEnvironment::FogType

Type of fog.

Enumerator
NONE	No fog.
HAZE	Linear increase in opacity with distance.
FOG	Exponential increase in opacity.
SMOKE	Exponential squared increase in opacity.

Definition at line 169 of file SoEnvironment.h.

Constructor & Destructor Documentation

◆ SoEnvironment()

SoEnvironment::SoEnvironment ( )

Creates an environment node with default settings.

Member Function Documentation

◆ getClassTypeId()

static SoType SoEnvironment::getClassTypeId ( )

static

Returns the type identifier for this class.

◆ getTypeId()

virtual SoType SoEnvironment::getTypeId ( ) const

virtual

Returns the type identifier for this specific instance.

Reimplemented from SoNode.

◆ isOverride()

virtual SbBool SoEnvironment::isOverride ( ) const

inlinevirtual

Returns the state of the overridden field.

Reimplemented from SoNode.

Definition at line 290 of file SoEnvironment.h.

◆ setOverride()

virtual void SoEnvironment::setOverride ( const SbBool state )

inlinevirtual

Sets the state of the overridden field.

see SoNode::setOverride doc.

Reimplemented from SoNode.

Definition at line 284 of file SoEnvironment.h.

Member Data Documentation

◆ ambientColor

SoSFColor SoEnvironment::ambientColor

RGB color of ambient lighting (for Phong lighting).

Default is 1, 1, 1.

Definition at line 199 of file SoEnvironment.h.

◆ ambientIntensity

SoSFFloat SoEnvironment::ambientIntensity

Intensity of ambient light (for Phong lighting).

Default is 0.2.

Definition at line 194 of file SoEnvironment.h.

◆ ambientOcclusion

SoSFBool SoEnvironment::ambientOcclusion

If set to TRUE, ambient occlusion is activated.

Default is FALSE

Limitation:

Important performance penalty can be experienced on Intel HD and UHD Graphics integrated GPU

NOTE: field available since Open Inventor 10.2

Definition at line 223 of file SoEnvironment.h.

◆ ambientOcclusionIntensity

SoSFFloat SoEnvironment::ambientOcclusionIntensity

Intensity of ambient occlusion: the higher the value, the darker the scene.

Default is 1.0.

Note: This field is "global", which means that if you have multiple instances of SoEnvironment node, any change in the intensity field of one instance will automatically be applied to the intensity field of the other instances. As a result, the intensity of the ambient occlusion is the same for the whole scene

NOTE: field available since Open Inventor 10.10

Definition at line 236 of file SoEnvironment.h.

◆ ambientOcclusionRadius

SoSFFloat SoEnvironment::ambientOcclusionRadius

Specifies the radius of the "sphere" (in world space) beyond which the ambient occlusion has no more effect.

Default is 4.0.

Note: This field is "global", which means that if you have multiple instances of SoEnvironment node, any change in the radius field of one instance will automatically be applied to the radius field of the other instances. As a result, the radius of the ambient occlusion is the same for the whole scene.

NOTE: field available since Open Inventor 10.10

Definition at line 249 of file SoEnvironment.h.

◆ attenuation

SoSFVec3f SoEnvironment::attenuation

Squared, linear, and constant light attenuation coefficients (in that order).

Default is 0, 0, 1. So, by default, no attenuation is applied.

Attenuation only applies to Point and Spot lights. In the physical world attenuation is proportional to 1/d^2, where 'd' is the distance from the surface to the light source. However, this function causes the light to decrease very rapidly, so linear and constant coefficients can also be specified. The attenuation factor applied to the light is 1 / (c0*d^2 + c1*d + c2).

Definition at line 211 of file SoEnvironment.h.

◆ fogColor

SoSFColor SoEnvironment::fogColor

Fog color.

Default is 1, 1, 1.

Definition at line 259 of file SoEnvironment.h.

◆ fogStart

SoSFFloat SoEnvironment::fogStart

Distance at which the linear fog HAZE starts to be applied.

Default is 0. Between fogStart and fogVisibility, the HAZE fog is linear, and beyond the fogVisibility distance, the fog totally obscures objects. This field has no effect on other types of fog.

Definition at line 266 of file SoEnvironment.h.

◆ fogType

SoSFEnum SoEnvironment::fogType

Type of fog.

Use enum FogType. Default is NONE.

Definition at line 255 of file SoEnvironment.h.

◆ fogVisibility

SoSFFloat SoEnvironment::fogVisibility

Fog visibility distance, which is the distance at which fog totally obscures objects.

Default is 0. A value of 0 (the default) causes the SoEnvironment node to set up fog so that the visibility is the distance to the far clipping plane of the current camera.

Definition at line 273 of file SoEnvironment.h.

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

Inventor/nodes/SoEnvironment.h

Open Inventor Release 2024.2.1

Public Types

Public Member Functions

Static Public Member Functions

Public Attributes

Detailed Description

FILE FORMAT/DEFAULT

ACTION BEHAVIOR

SEE ALSO

Member Enumeration Documentation

◆ FogType

Constructor & Destructor Documentation

◆ SoEnvironment()

Member Function Documentation

◆ getClassTypeId()

◆ getTypeId()

◆ isOverride()

◆ setOverride()

Member Data Documentation

◆ ambientColor

◆ ambientIntensity

◆ ambientOcclusion

◆ ambientOcclusionIntensity

◆ ambientOcclusionRadius

◆ attenuation

◆ fogColor

◆ fogStart

◆ fogType

◆ fogVisibility