man SoEnvironment (Fonctions bibliothèques) -

NAME

SoEnvironment -

SYNOPSIS



#include <Inventor/nodes/SoEnvironment.h>

Inherits SoNode.

Detailed Description

The SoEnvironment class is a node for specifying global rendering parameters.

This node type provides the application programmer with the ability to set global parameters influencing lighting and fog.

FILE FORMAT/DEFAULTS: 

    Environment {
        ambientIntensity 0.2
        ambientColor 1 1 1
        attenuation 0 0 1
        fogType NONE
        fogColor 1 1 1
        fogVisibility 0
    }

Public Types

enum FogType { NONE = SoEnvironmentElement::NONE, HAZE = SoEnvironmentElement::HAZE, FOG = SoEnvironmentElement::FOG, SMOKE = SoEnvironmentElement::SMOKE }

Public Member Functions

virtual SoType getTypeId (void) const

SoEnvironment (void)

virtual void GLRender (SoGLRenderAction *action)

virtual void callback (SoCallbackAction *action)

Static Public Member Functions

static SoType getClassTypeId (void)

static void initClass (void)

Public Attributes

SoSFFloat ambientIntensity

SoSFColor ambientColor

SoSFVec3f attenuation

SoSFEnum fogType

SoSFColor fogColor

SoSFFloat fogVisibility

Protected Member Functions

virtual const SoFieldData * getFieldData (void) const

virtual ~SoEnvironment ()

Static Protected Member Functions

static const SoFieldData ** getFieldDataPtr (void)

Member Enumeration Documentation

enum SoEnvironment::FogType

Enumeration of available types of fog.

Enumerator:

NONE
No fog. Visibility will be equal for all objects, independent of distance to camera.
HAZE
Fog where visibility will decrease linearly with distance to camera.
FOG
Fog where visibility will decrease exponentially with distance to camera.
SMOKE
Fog where visibility will decrease exponentially with the square of the distance to camera (simulating really thick fog).

Constructor & Destructor Documentation

SoEnvironment::SoEnvironment (void)

Constructor.

SoEnvironment::~SoEnvironment () [protected, virtual]

Destructor.

Member Function Documentation

SoType SoEnvironment::getClassTypeId (void) [static]

This static method returns the SoType object associated with objects of this class.

Reimplemented from SoNode.

SoType SoEnvironment::getTypeId (void) const [virtual]

Returns the type identification of an object derived from a class inheriting SoBase. This is used for run-time type checking and 'downward' casting.

Usage example: 

  void foo(SoNode * node)
  {
    if (node->getTypeId() == SoFile::getClassTypeId()) {
      SoFile * filenode = (SoFile *)node;  // safe downward cast, knows the type
    }
    else if (node->getTypeId().isOfType(SoGroup::getClassTypeId())) {
      SoGroup * group = (SoGroup *)node;  // safe downward cast, knows the type
    }
  }

For application programmers wanting to extend the library with new nodes, engines, nodekits, draggers or others: this method needs to be overridden in all subclasses. This is typically done as part of setting up the full type system for extension classes, which is usually accomplished by using the pre-defined macros available through for instance Inventor/nodes/SoSubNode.h (SO_NODE_INIT_CLASS and SO_NODE_CONSTRUCTOR for node classes), Inventor/engines/SoSubEngine.h (for engine classes) and so on.

For more information on writing Coin extensions, see the class documentation of the toplevel superclasses for the various class groups.

Implements SoBase.

const SoFieldData ** SoEnvironment::getFieldDataPtr (void) [static, protected]

This API member is considered internal to the library, as it is not likely to be of interest to the application programmer.

Reimplemented from SoNode.

const SoFieldData * SoEnvironment::getFieldData (void) const [protected, virtual]

Returns a pointer to the class-wide field data storage object for this instance. If no fields are present, returns NULL.

Reimplemented from SoFieldContainer.

void SoEnvironment::initClass (void) [static]

Sets up initialization for data common to all instances of this class, like submitting necessary information to the Coin type system.

Reimplemented from SoNode.

void SoEnvironment::GLRender (SoGLRenderAction * action) [virtual]

Action method for the SoGLRenderAction.

This is called during rendering traversals. Nodes influencing the rendering state in any way or who wants to throw geometry primitives at OpenGL overrides this method.

Reimplemented from SoNode.

void SoEnvironment::callback (SoCallbackAction * action) [virtual]

Action method for SoCallbackAction.

Simply updates the state according to how the node behaves for the render action, so the application programmer can use the SoCallbackAction for extracting information about the scene graph.

Reimplemented from SoNode.

Member Data Documentation

SoSFFloat SoEnvironment::ambientIntensity

A global ambient value for the light intensity for the complete scene. This will provide some light even when there are no light sources defined for the scene.

Valid values is from 0.0 (no ambient light) to 1.0 (full ambient light intensity). Default value is 0.2.

SoSFColor SoEnvironment::ambientColor

The color of the global ambient light. Defaults to full intensity white, ie <1.0, 1.0, 1.0>.

Each component of this RGB vector is multiplied with the scalar value of SoEnvironment::ambientIntensity.

SoSFVec3f SoEnvironment::attenuation

Light attenuation coefficients.

SoSFEnum SoEnvironment::fogType

The fog model. See SoEnvironment::FoType.

SoSFColor SoEnvironment::fogColor

Color of fog. Defaults to full intensity white.

SoSFFloat SoEnvironment::fogVisibility

The 'cut-off' distance from the camera where objects will be totally obscured by fog. If set to 0.0, the far plane distance will be used instead.

Default value is 0.0.

Author

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