SceneOrbiter Class Reference
[Nodes]

[PREVIEW] Tool class for building a basic interactive OpenInventor application with mode-less scene "orbiter" viewing behavior. More...

#include <Inventor/ViewerComponents/nodes/SceneOrbiter.h>

Inheritance diagram for SceneOrbiter:
SceneInteractor SoSeparator SoGroup SoNode SoFieldContainer SoBase SoRefCounter SoTypedObject

List of all members.

Public Types

enum  RotationMethod {
  TURNTABLE,
  TRACKBALL
}

Public Member Functions

 SceneOrbiter ()
virtual ~SceneOrbiter ()
void setConstraintLevel (float level)
float getConstraintLevel ()
void setRotationMethod (RotationMethod method)
RotationMethod getRotationMethod ()
void setUpAxis (openinventor::inventor::Axis::Type axis)
openinventor::inventor::Axis::Type getUpAxis ()
void enableViewingCube (bool enabled)
bool isViewingCubeEnabled () const
SoViewingCubegetViewingCube ()
virtual void setCameraMode (SceneInteractor::CameraMode mode)

Detailed Description

[PREVIEW] Tool class for building a basic interactive OpenInventor application with mode-less scene "orbiter" viewing behavior.

The SceneOrbiter is an extension of the SceneInteractor node that provides camera and headlight manipulations like panning, zooming and orbiting similar to the classic Open Inventor "Examiner" viewer classes (e.g. SoWinExaminerViewer) and the SceneExaminer (in Orbit navigation mode).

The SceneOrbiter provides a "mode-less" viewer which is very convenient for users. The Examiner viewer and SceneExaminer viewers are always in either viewing mode (mouse events control the camera) or in selection mode (mouse events are sent to the scene graph and objects can be selected). This often requires the user to frequently switch between viewing and selection mode (for example by pressing the ESC key) while interacting with the scene. SceneOrbiter does not have modes. For example, a mouse click without moving the mouse is interpreted as a selection and the event is sent to the scene graph, but a mouse click and "drag" is interpreted as controlling the camera.

The SceneOrbiter provides two different methods to control the rotation of the camera around the scene : trackball and turntable, see RotationMethod enum.
The trackball method allows the camera to move along any circular orbit around the scene and look in the direction of its center. The orbit orientation can change at any time while interpreting a mouse drag. Thus the trackball is known as an unconstrained orbiting mode. The trackball is the unique method used by the historical examiner viewer and by the SceneExaminer.
The additional turntable method is a more constrained orbiting mode. It lets the camera move only along vertical orbits such as the earth meridians, and along horizontal circles such as the earth parallels. The vertical orbits and the horizontal circles are related to an up axis, which can be changed calling setUpAxis. The horizontal circles are centered around this up axis, and the vertical orbits share their south and north pole on this up axis. As the camera cannot move along any other circle, this mode is more constrained compared to the trackball mode. However, it provides a more natural navigation experience when viewing a scene that has strong vertical and horizontal references. For instance, when orbiting in turntable mode around a scene representing the Eiffel tower, this one always looks vertical on your screen. Compared to the trackball mode, the turntable mode does not need any tedious small mousemove correction to keep the scene well aligned with the borders of the screen.

The 'headlight', an SoDirectionalLight node, is automatically aligned with the camera's view direction.

An SoViewingCube node is automatically added to the scene. The viewing cube can be hidden by calling the enableViewingCube() method. Note that the up axis of the viewing cube is synchronized with the up axis of the SceneOrbiter.

See parent class SceneInteractor for more details about the structure of the internal scene graph.

The SceneOrbiter uses an instance of SoCameraInteractor to manipulate the camera in response to OpenInventor events.

Notes:

USAGE

SEE ALSO

SceneInteractor, SoCameraInteractor, SiInteractionModeListener

What is a Preview Feature ?:

Member Enumeration Documentation

Defines how the mouse events or touch events control the rotations of the scene.

Enumerator:
TURNTABLE 

Constrained mode which forces the camera to follow meridians and parallel circles related to the up-axis.

This mode is very useful to help the user to see the up-axis of the scene vertical, i.e. parallel to the left/right borders of the screen.

TRACKBALL 

Unconstrained mode which allows the camera to follow any circular orbit.

Thus, this mode allows to render the scene with any orientation.


Constructor & Destructor Documentation

SceneOrbiter::SceneOrbiter (  ) 

Constructor.

virtual SceneOrbiter::~SceneOrbiter (  )  [virtual]

Destructor.


Member Function Documentation

void SceneOrbiter::enableViewingCube ( bool  enabled  ) 

Enables or disables viewing cube.

Default is true.

float SceneOrbiter::getConstraintLevel (  ) 

Returns the current constraint level which limits the turntable rotation.

Returns:
the constraint level.
RotationMethod SceneOrbiter::getRotationMethod (  ) 

Returns the current scene rotation method.

openinventor::inventor::Axis::Type SceneOrbiter::getUpAxis (  ) 

Returns the current up axis of the scene.

SoViewingCube* SceneOrbiter::getViewingCube (  ) 

Returns the viewing cube object.

bool SceneOrbiter::isViewingCubeEnabled (  )  const

Returns if viewing cube is enabled.

virtual void SceneOrbiter::setCameraMode ( SceneInteractor::CameraMode  mode  )  [virtual]

Selects perspective or orthographic camera.

Default is perspective.

Reimplemented from SceneInteractor.

void SceneOrbiter::setConstraintLevel ( float  level  ) 

Sets the constraint level to limit the turntable rotation.

The level is a value between [0,1] used to adjust the constraint on the turntable rotation according to the speed of movement :

  • 0 means no constraint on the rotation regardless of the interaction speed
  • 1 means very strongly constrained even if interaction is slow.

This prevents unexpected changes in the axis of rotation during fast movements. Default is 0 which means no constraint on the rotation.

Parameters:
level the constraint level.
void SceneOrbiter::setRotationMethod ( RotationMethod  method  ) 

Sets the scene rotation method.

Default is TURNTABLE.

void SceneOrbiter::setUpAxis ( openinventor::inventor::Axis::Type  axis  ) 

Sets the up axis of the scene.

Default is Y. Note that the up axis of the viewing cube is synchronized with the up axis of the SceneOrbiter.


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

Open Inventor Toolkit reference manual, generated on 8 May 2022
Copyright © Thermo Fisher Scientific All rights reserved.
http://www.openinventor.com/