SoVRMLProximitySensor: The sovrmlproximitysensor class is used to generate events when the viewer enters or exits a region. 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:

SYNOPSIS

#include <Inventor/VRMLnodes/SoVRMLProximitySensor.h>

Inherits SoNode.

Public Member Functions

virtual SoType getTypeId (void) const

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

virtual SbBool affectsState (void) const

virtual void doAction (SoAction *action)

virtual void GLRender (SoGLRenderAction *action)

virtual void callback (SoCallbackAction *action)

virtual void rayPick (SoRayPickAction *action)

virtual void getBoundingBox (SoGetBoundingBoxAction *action)

Static Public Member Functions

static SoType getClassTypeId (void)

static void initClass (void)

Public Attributes

SoSFVec3f center

SoSFVec3f size

SoSFBool enabled

SoSFBool isActive

SoSFVec3f position_changed

SoSFRotation orientation_changed

SoSFTime enterTime

SoSFTime exitTime

Protected Member Functions

virtual const SoFieldData * getFieldData (void) const

virtual ~SoVRMLProximitySensor ()

virtual void notify (SoNotList *list)

Static Protected Member Functions

static const SoFieldData ** getFieldDataPtr (void)

Additional Inherited Members

Detailed Description

The SoVRMLProximitySensor class is used to generate events when the viewer enters or exits a region.

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:

ProximitySensor {
  exposedField SFVec3f    center      0 0 0    # (-,)
  exposedField SFVec3f    size        0 0 0    # [0,)
  exposedField SFBool     enabled     TRUE
  eventOut     SFBool     isActive
  eventOut     SFVec3f    position_changed
  eventOut     SFRotation orientation_changed
  eventOut     SFTime     enterTime
  eventOut     SFTime     exitTime
}

The ProximitySensor node generates events when the viewer enters, exits, and moves within a region in space (defined by a box).

A proximity sensor is enabled or disabled by sending it an enabled event with a value of TRUE or FALSE. A disabled sensor does not send events.

A ProximitySensor node generates isActive TRUE/FALSE events as the viewer enters and exits the rectangular box defined by its center and size fields. Browsers shall interpolate viewer positions and timestamp the isActive events with the exact time the viewer first intersected the proximity region.

The center field defines the centre point of the proximity region in object space. The size field specifies a vector which defines the width (x), height (y), and depth (z) of the box bounding the region. The components of the size field shall be greater than or equal to zero. ProximitySensor nodes are affected by the hierarchical transformations of their parents.

The enterTime event is generated whenever the isActive TRUE event is generated (user enters the box), and exitTime events are generated whenever an isActive FALSE event is generated (user exits the box).

The position_changed and orientation_changed eventOuts send events whenever the user is contained within the proximity region and the position and orientation of the viewer changes with respect to the ProximitySensor node's coordinate system including enter and exit times.

The viewer movement may be a result of a variety of circumstances resulting from browser navigation, ProximitySensor node's coordinate system changes, or bound Viewpoint node's position or orientation changes.

Each ProximitySensor node behaves independently of all other ProximitySensor nodes. Every enabled ProximitySensor node that is affected by the viewer's movement receives and sends events, possibly resulting in multiple

ProximitySensor nodes receiving and sending events simultaneously. Unlike TouchSensor nodes, there is no notion of a ProximitySensor node lower in the scene graph 'grabbing' events.

Instanced (DEF/USE) ProximitySensor nodes use the union of all the boxes to check for enter and exit. A multiply instanced ProximitySensor node will detect enter and exit for all instances of the box and send enter/exit events appropriately. However, the results are undefined if the any of the boxes of a multiply instanced ProximitySensor node overlap.

A ProximitySensor node that surrounds the entire world has an enterTime equal to the time that the world was entered and can be used to start up animations or behaviours as soon as a world is loaded.

A ProximitySensor node with a box containing zero volume (i.e., any size field element of 0.0) cannot generate events. This is equivalent to setting the enabled field to FALSE.

A ProximitySensor read from a VRML file shall generate isActive TRUE, position_changed, orientation_changed and enterTime events if the sensor is enabled and the viewer is inside the proximity region.

A ProximitySensor inserted into the transformation hierarchy shall generate isActive TRUE, position_changed, orientation_changed and enterTime events if the sensor is enabled and the viewer is inside the proximity region.

A ProximitySensor removed from the transformation hierarchy shall generate isActive FALSE, position_changed, orientation_changed and exitTime events if the sensor is enabled and the viewer is inside the proximity region.

Constructor & Destructor Documentation

SoVRMLProximitySensor::SoVRMLProximitySensor (void)

Constructor.

SoVRMLProximitySensor::~SoVRMLProximitySensor ()\fC [protected]\fP, \fC [virtual]\fP

Destructor.

Member Function Documentation

\fBSoType\fP SoVRMLProximitySensor::getTypeId (void) const\fC [virtual]\fP

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
  }
}

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 \fBSoFieldData\fP * SoVRMLProximitySensor::getFieldData (void) const\fC [protected]\fP, \fC [virtual]\fP

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

Reimplemented from SoFieldContainer.

SbBool SoVRMLProximitySensor::affectsState (void) const\fC [virtual]\fP

Returns TRUE if the node could have any effect on the state during traversal.

If it returns FALSE, no data in the traversal-state will change from the pre-traversal state to the post-traversal state. The SoSeparator node will for instance return FALSE, as it pushes and pops the state before and after traversal of its children. All SoShape nodes will also return FALSE, as just pushing out geometry data to the rendering engine won't affect the actual rendering state.

The default method returns TRUE, on a 'better safe than sorry' philosophy.