man SoVRMLVisibilitySensor (Fonctions bibliothèques) -

NAME

SoVRMLVisibilitySensor -

SYNOPSIS



#include <Inventor/VRMLnodes/SoVRMLVisibilitySensor.h>

Inherits SoNode.

Detailed Description

The SoVRMLVisibilitySensor class will generate events based on visibility.

The detailed class documentation is taken verbatim from the VRML97 standard (ISO/IEC 14772-1:1997). It is copyright The Web3D Consortium, and is used by permission of the Consortium:. 

  VisibilitySensor {
    exposedField SFVec3f center   0 0 0      # (-,)
    exposedField SFBool  enabled  TRUE
    exposedField SFVec3f size     0 0 0      # [0,)
    eventOut     SFTime  enterTime
    eventOut     SFTime  exitTime
    eventOut     SFBool  isActive
  }
  .fi


The VisibilitySensor node detects visibility changes of a rectangular box as the user navigates the world. VisibilitySensor is typically used to detect when the user can see a specific object or region in the scene in order to activate or deactivate some behaviour or animation. The purpose is often to attract the attention of the user or to improve performance.

The enabled field enables and disables the VisibilitySensor node. If enabled is set to FALSE, the VisibilitySensor node does not send events. If enabled is TRUE, the VisibilitySensor node detects changes to the visibility status of the box specified and sends events through the isActive eventOut. A TRUE event is output to isActive when any portion of the box impacts the rendered view. A FALSE event is sent when the box has no effect on the view. Browsers shall guarantee that, if isActive is FALSE, the box has absolutely no effect on the rendered view. Browsers may err liberally when isActive is TRUE. For example, the box may affect the rendering.

The exposed fields center and size specify the object space location of the box centre and the extents of the box (i.e., width, height, and depth). The VisibilitySensor node's box is affected by hierarchical transformations of its parents. The components of the size field shall be greater than or equal to zero.

The enterTime event is generated whenever the isActive TRUE event is generated, and exitTime events are generated whenever isActive FALSE events are generated. A VisibilitySensor read from a VRML file shall generate isActive TRUE and enterTime events if the sensor is enabled and the visibility box is visible. A VisibilitySensor inserted into the transformation hierarchy shall generate isActive TRUE and enterTime events if the sensor is enabled and the visibility box is visible. A VisibilitySensor removed from the transformation hierarchy shall generate isActive FALSE and exitTime events if the sensor is enabled and the visibility box is visible.

Each VisibilitySensor node behaves independently of all other VisibilitySensor nodes. Every enabled VisibilitySensor node that is affected by the user's movement receives and sends events, possibly resulting in multiple VisibilitySensor nodes receiving and sending events simultaneously. Unlike TouchSensor nodes, there is no notion of a VisibilitySensor node lower in the scene graph 'grabbing' events. Multiply instanced VisibilitySensor nodes (i.e., DEF/USE) use the union of all the boxes defined by their instances. An instanced VisibilitySensor node shall detect visibility changes for all instances of the box and send events appropriately.

Public Member Functions

virtual SoType getTypeId (void) const

SoVRMLVisibilitySensor (void)

virtual void GLRender (SoGLRenderAction *action)

Static Public Member Functions

static SoType getClassTypeId (void)

static void initClass (void)

Public Attributes

SoSFVec3f center

SoSFVec3f size

SoSFBool enabled

Protected Member Functions

virtual const SoFieldData * getFieldData (void) const

virtual ~SoVRMLVisibilitySensor ()

Static Protected Member Functions

static const SoFieldData ** getFieldDataPtr (void)

Protected Attributes

SoSFTime enterTime

SoSFTime exitTime

SoSFBool isActive

Constructor & Destructor Documentation

SoVRMLVisibilitySensor::SoVRMLVisibilitySensor (void)

Constructor.

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

Destructor.

Member Function Documentation

SoType SoVRMLVisibilitySensor::getClassTypeId (void) [static]

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

Reimplemented from SoNode.

SoType SoVRMLVisibilitySensor::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 ** SoVRMLVisibilitySensor::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 * SoVRMLVisibilitySensor::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 SoVRMLVisibilitySensor::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 SoVRMLVisibilitySensor::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.

Member Data Documentation

SoSFVec3f SoVRMLVisibilitySensor::center

Visibility area center. Default value is (0, 0, 0).

SoSFVec3f SoVRMLVisibilitySensor::size

Visibility area size. Default value is (0, 0, 0).

SoSFBool SoVRMLVisibilitySensor::enabled

Enable/disable sensor. Default value is TRUE.

SoSFTime SoVRMLVisibilitySensor::enterTime [protected]

An event out that is triggered when the region becomes visible.

SoSFTime SoVRMLVisibilitySensor::exitTime [protected]

An event out that is triggered when the region becomes not visible.

SoSFBool SoVRMLVisibilitySensor::isActive [protected]

An event out that is generated when the visibility state changes.

Author

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