SoVRMLSphereSensor -

#include <Inventor/VRMLnodes/SoVRMLSphereSensor>

Inherits SoVRMLDragSensor.

The SoVRMLSphereSensor class maps pointer motion into rotations on a sphere.

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:.

  SphereSensor {
    exposedField SFBool     autoOffset        TRUE
    exposedField SFBool     enabled           TRUE
    exposedField SFRotation offset            0 1 0 0  # [-1,1],(-,)
    eventOut     SFBool     isActive
    eventOut     SFRotation rotation_changed
    eventOut     SFVec3f    trackPoint_changed
  }
  .fi


The SphereSensor node maps pointing device motion into spherical rotation about the origin of the local coordinate system. The SphereSensor node uses the descendent geometry of its parent node to determine whether it is liable to generate events.

The enabled exposed field enables and disables the SphereSensor node. If enabled is TRUE, the sensor reacts appropriately to user events. If enabled is FALSE, the sensor does not track user input or send events. If enabled receives a FALSE event and isActive is TRUE, the sensor becomes disabled and deactivated, and outputs an isActive FALSE event. If enabled receives a TRUE event the sensor is enabled and ready for user activation.

The SphereSensor node generates events when the pointing device is activated while the pointer is indicating any descendent geometry nodes of the sensor's parent group. See 4.6.7.5, Activating and manipulating sensors (<http://www.web3d.org/x3d/specifications/vrml/ISO-IEC-14772-IS-VRML97WithAmendment1/part1/concepts.html#4.6.7.5>), for details on using the pointing device to activate the SphereSensor.

Upon activation of the pointing device (e.g., mouse button down) over the sensor's geometry, an isActive TRUE event is sent. The vector defined by the initial point of intersection on the SphereSensor's geometry and the local origin determines the radius of the sphere that is used to map subsequent pointing device motion while dragging. The virtual sphere defined by this radius and the local origin at the time of activation is used to interpret subsequent pointing device motion and is not affected by any changes to the sensor's coordinate system while the sensor is active.

For each position of the bearing, a rotation_changed event is sent which corresponds to the sum of the relative rotation from the original intersection point plus the offset value. trackPoint_changed events reflect the unclamped drag position on the surface of this sphere. When the pointing device is deactivated and autoOffset is TRUE, offset is set to the last rotation_changed value and an offset_changed event is generated. See 4.6.7.4, Drag sensors (<http://www.web3d.org/x3d/specifications/vrml/ISO-IEC-14772-IS-VRML97WithAmendment1/part1/concepts.html#4.6.7.4>), for more details.

When the sensor generates an isActive TRUE event, it grabs all further motion events from the pointing device until it is released and generates an isActive FALSE event (other pointing-device sensors shall not generate events during this time). Motion of the pointing device while isActive is TRUE is termed a 'drag'. If a 2D pointing device is in use, isActive events will typically reflect the state of the primary button associated with the device (i.e., isActive is TRUE when the primary button is pressed and FALSE when it is released). If a 3D pointing device (e.g., wand) is in use, isActive events will typically reflect whether the pointer is within (or in contact with) the sensor's geometry.

While the pointing device is activated, trackPoint_changed and rotation_changed events are output. trackPoint_changed events represent the unclamped intersection points on the surface of the invisible sphere. If the pointing device is dragged off the sphere while activated, browsers may interpret this in a variety of ways (e.g., clamp all values to the sphere or continue to rotate as the point is dragged away from the sphere).

Each movement of the pointing device while isActive is TRUE generates trackPoint_changed and rotation_changed events. Further information about this behaviour can be found in 4.6.7.3 (<http://www.web3d.org/x3d/specifications/vrml/ISO-IEC-14772-IS-VRML97WithAmendment1/part1/concepts.html#4.6.7.3>), Pointing-device sensors, 4.6.7.4, Drag sensors (<http://www.web3d.org/x3d/specifications/vrml/ISO-IEC-14772-IS-VRML97WithAmendment1/part1/concepts.html#4.6.7.4>), and 4.6.7.5, Activating and manipulating sensors (<http://www.web3d.org/x3d/specifications/vrml/ISO-IEC-14772-IS-VRML97WithAmendment1/part1/concepts.html#4.6.7.5>). 

Public Member Functions

Static Public Member Functions

Public Attributes

Protected Member Functions

Static Protected Member Functions

SoVRMLSphereSensor::SoVRMLSphereSensor (void)

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

SoType SoVRMLSphereSensor::getClassTypeId (void) [static]

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

  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
    }
  }

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

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

void SoVRMLSphereSensor::initClass (void) [static]

SbBool SoVRMLSphereSensor::dragStart (void) [protected, virtual]

void SoVRMLSphereSensor::drag (void) [protected, virtual]

void SoVRMLSphereSensor::dragFinish (void) [protected, virtual]

SoSFRotation SoVRMLSphereSensor::offset

SoSFRotation SoVRMLSphereSensor::rotation_changed

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