SoHaloHighlightRenderAction Class Reference

A halo highlight style. More...

#include <Inventor/actions/SoHaloHighlightRenderAction.h>

Inheritance diagram for SoHaloHighlightRenderAction:

Public Member Functions
virtual SoType	getTypeId () const
	Returns the type identifier for this specific instance.
	SoHaloHighlightRenderAction ()
	SoHaloHighlightRenderAction (const SbViewportRegion &viewportRegion)
virtual	~SoHaloHighlightRenderAction ()
void	setHaloColor (const SbColor &color)
	Defines the color of the highlight.
const SbColor &	getHaloColor () const
	See setHaloColor()
void	setHaloWidth (int width)
	Defines the width of the halo in pixels.
int	getHaloWidth () const
	See setHaloWidth()
void	setHaloAlwaysVisible (bool alwaysVisible)
	Defines whether or not the halo can be seen through objects that are placed in front of selected shapes.
bool	isHaloAlwaysVisible () const
	See setHaloAlwaysVisible()
void	setHaloSmoothFactor (float smoothFactor)
	Defines the amount of alpha attenuation of the halo contour.
float	getHaloSmoothFactor () const
	See setHaloSmoothFactor()
Public Member Functions inherited from SoHighlightRenderAction
virtual void	clearApplyResult ()
	When applied, an action may reference nodes or create objects (e.g.
virtual void	apply (SoNode *node)
	This renders the passed scene graph, and also renders highlighted selected objects as specified by the first SoSelection node found in the scene graph.
void	setVisible (SbBool b)
	This provides a convenient mechanism for turning highlights off or on.
SbBool	isVisible () const
	Returns whether highlights will be rendered or not.
Public Member Functions inherited from SoGLRenderAction
	SoGLRenderAction (const SbViewportRegion &viewportRegion)
	Constructor.
void	setViewportRegion (const SbViewportRegion &newRegion)
	Changes viewport region to use for rendering.
const SbViewportRegion &	getViewportRegion () const
	Returns viewport region to use for rendering.
void	setLogicalViewportRegion (const SbViewportRegion &newLogicalRegion)
	Sets current logical viewport region to use for rendering.
const SbViewportRegion &	getLogicalViewportRegion () const
	Returns current logical viewport region.
void	setUpdateArea (const SbVec2f &origin, const SbVec2f &size)
	Sets the current update area, which is the rectangular area of the viewport region that will actually be rendered into.
void	getUpdateArea (SbVec2f &origin, SbVec2f &size) const
	Returns the current update area.
void	setAbortCallback (SoGLRenderAbortCB *func, void *userData)
	Sets callback to call during rendering to test for an abort condition.
void	setTransparencyType (TransparencyType type)
	Sets global transparency algorithm to use when rendering.
TransparencyType	getTransparencyType () const
	Returns transparency quality level to use when rendering.
void	setFastEditSavePolicy (FastEditSavePolicy policy, SbBool fastEditDelayedObjects=FALSE)
	Sets fast editing save policy to use when rendering.
FastEditSavePolicy	getFastEditSavePolicy () const
	Returns fast editing save policy used when rendering.
SoDEPRECATED void	setSmoothing (SbBool smooth)
	Sets smoothing flag.
SoDEPRECATED SbBool	isSmoothing () const
	Returns smoothing flag.
void	setNumPasses (int num)
	Sets number of rendering passes for multipass antialiasing.
int	getNumPasses () const
	Gets number of rendering passes for multipass rendering.
void	setPassUpdate (SbBool flag)
	Sets a flag indicating whether intermediate results are displayed after each antialiasing pass for progressive improvement (default is FALSE).
SbBool	isPassUpdate () const
	Returns a flag indicating whether intermediate results are displayed after each antialiasing pass for progressive improvement.
void	setPassCallback (SoGLRenderPassCB *func, void *userData)
	Sets a callback function to invoke between passes when antialiasing.
void	setCacheContext (uint32_t context)
	Sets the OpenGL cache context.
uint32_t	getCacheContext () const
	Returns the OpenGL cache context id for this action.
void	setSortedLayersNumPasses (int num)
	Sets the number of rendering passes used when transparency type is SORTED_PIXEL.
int	getSortedLayersNumPasses () const
	Returns the number of rendering passes used when transparency type is SORTED_PIXEL.
void	setAlphaTest (SbBool flag)
	Enable or disable the OpenGL alpha test for rendering.
SbBool	isAlphaTest () const
	Returns whether the OpenGL alpha test is enabled for rendering.
void	setRenderingIsRemote (SbBool flag)
	Sets whether or not "remote" rendering is done.
SbBool	getRenderingIsRemote () const
	Returns TRUE if remote rendering is being done.
virtual void	invalidateState ()
	Invalidate the state, forcing it to be recreated at the next apply.
void	setDecimationValue (SoDecimationTypeElement::Type type, float percentage=1.0)
	Sets decimation percentage, the value should be a number between 0.0 and 1.0 Useful for reducing the number of triangles rendered in the scene.
SoDecimationTypeElement::Type	getDecimationType ()
	Gets decimation type.
float	getDecimationPercentage ()
	Gets decimation percentage, the value should be a number between 0.0 and 1.0.
void	setInvalidateCacheMode (InvalidateCacheMode icm)
	Enables or disables the invalidation of render caches.
InvalidateCacheMode	getInvalidateCacheMode ()
	Returns the current cache invalidation mode.
uint32_t	getFrameCounter () const
	Returns the current frame counter.
void	resetFrameCounter (uint32_t count=0)
	Reset the frame counter.
virtual void	apply (SoPath *path)
	Initiates an action on the graph defined by a path.
virtual void	apply (const SoPathList &pathList, SbBool obeysRules=FALSE)
	Initiates an action on the graph defined by a list of paths.
void	shouldAutoCache (AutoCacheMode mode)
	Called by nodes to say that they should/shouldn't be auto-cached (pass TRUE if should, FALSE if shouldn't, don't call this method at all if the node doesn't care):
Public Member Functions inherited from SoAction
virtual	~SoAction ()
	Destructor.
void	stopActionInBranch ()
	This function stops the action in the current Scene Graph branch.
SbBool	getContinueActionInBranchFlag () const
	This function indicates if the action must stop in the current branch.
void	resetContinueActionInBranchFlag ()
	This function resets the continue action flag.
void	useAlternateRep (const SbBool enable)
	Tell the action to use alternate representations during traversal when available.
SbBool	isUsingAlternateRep () const
	Returns TRUE if current action is using alternate representations.
void	setSceneManager (SoSceneManager *mgr)
	Set the scene manager associated with this action (if any ).
SoSceneManager *	getSceneManager () const
	Return the SoSceneManager associated with this action.
virtual void	forwardTraversal (SoNode *node)
	Traverse a node that is not part of the current scenegraph.
virtual void	forwardTraversal (SoPath *path)
	Traverse a path that is not part of the current scenegraph.
DistribMode	getDistribMode () const
	Returns the distribution mode of this action across a cluster (ScaleViz-Cluster only).
AppliedCode	getWhatAppliedTo () const
	Returns code indicating what action is being applied to.
SoNode *	getNodeAppliedTo () const
	Returns the node the action is being applied to.
SoPath *	getPathAppliedTo () const
	Returns the path the action is being applied to.
const SoPathList *	getPathListAppliedTo () const
	Returns the path list the action is being applied to.
const SoPathList *	getOriginalPathListAppliedTo () const
	Returns the original path list the action is being applied to.
SbBool	isLastPathListAppliedTo () const
	Returns TRUE if the current list is the last one from the original.
PathCode	getPathCode (int &numIndices, const int *&indices)
	Returns path code based on where current node (the node at the end of the current path) lies with respect to the path(s) the action is being applied to.
PathCode	getPathCodeMI (int &numIndices, const int *&indices, const int *&instanceIndices)
	Extender API: available to programmers who wish to extend the toolkit
void	traverse (SoNode *node)
	Does traversal of a graph rooted by a node.
SbBool	hasTerminated () const
	Returns TRUE if the traversal has reached a termination condition.
const SoPath *	getCurPath ()
	Returns the path accumulated during traversal, i.e., the chain of nodes from the root of the traversed graph to the current node being traversed.
SoState *	getState () const
	Gets the state from the action.
void	setPipeId (int id)
	Sets pipe identifier in the range [1..N] associated to this render action while running a ScaleViz Multipipe configuration.
int	getPipeId () const
	Gets pipe identifier in the range [1..N] associated to this render action while running a ScaleViz Multipipe configuration.
bool	isBeingApplied ()
	Returns TRUE if this action is currently being applied.
Public Member Functions inherited from SoTypedObject
SbBool	isOfType (const SoType &type) const
	Returns TRUE if this object is of the type specified in type or is derived from that type.
template<typename TypedObjectClass >
SbBool	isOfType () const
	Returns TRUE if this object is of the type of class TypedObjectClass or is derived from that class.

Static Public Member Functions
static SoType	getClassTypeId ()
	Returns the type identifier for this class.
static void	initClass ()
static void	exitClass ()
Static Public Member Functions inherited from SoHighlightRenderAction
static SoType	getClassTypeId ()
	Returns the type identifier for this class.
Static Public Member Functions inherited from SoGLRenderAction
static SoType	getClassTypeId ()
	Returns the type identifier for this class.
static uint32_t	generateCacheContext ()
	Generates and returns a new cache context id.
static bool	isUsedCacheContext (uint32_t context)
	Returns TRUE if the specified cache context id is currently used by any SoGLRenderAction.
static SbBool	isSortedLayersSupported (SoState *state=NULL)
	Indicates if SORTED_PIXEL transparency is supported by your graphics board on the current context.
Static Public Member Functions inherited from SoAction
static SoType	getClassTypeId ()
	Returns the type identifier for this class.
static void	nullAction (SoAction *, SoNode *)
	Null action method that can be stored in lookup table when desired.
Static Public Member Functions inherited from SoTypedObject
static SoType	getClassTypeId ()
	Returns the type identifier for this class.

Additional Inherited Members
Public Types inherited from SoGLRenderAction
enum	TransparencyType {   NO_TRANSPARENCY ,   NO_SORT ,   OPAQUE_FIRST ,   SORTED_OBJECT ,   SORTED_PIXEL }
	Transparency rendering algorithm. More...
enum	FastEditSavePolicy {   DISABLE ,   EACH_FRAME ,   WHEN_NEEDED }
	Fast edit traversal types. More...
enum	AbortCode {   CONTINUE ,   ABORT ,   PRUNE ,   DELAY }
	Possible return codes from a render abort callback. More...
enum	InvalidateCacheMode {   OFF ,   ONCE ,   ALWAYS }
	Invalidate cache mode. More...
enum	AutoCacheMode {   DO_AUTO_CACHE = 1 ,   DONT_AUTO_CACHE = 2 }
	Two bits are stored. More...
typedef void	SoGLRenderPassCB(void *userData)
	Callback functions used between rendering passes should be of this type.
typedef AbortCode	SoGLRenderAbortCB(void *userData)
	Callback functions for render abort should be of this type.
Public Types inherited from SoAction
enum	DistribMode {   LOCAL_ONLY ,   CLUSTER_ONLY ,   ALL }
	This is used to define the way an action is distributed across a cluster. More...
enum	AppliedCode {   NODE ,   PATH ,   PATH_LIST }
	This enum is used to determine what the action is being applied to. More...
enum	PathCode {   NO_PATH ,   IN_PATH ,   BELOW_PATH ,   OFF_PATH }
	This enum may be used during traversal of nodes to indicate where the node is with respect to the path being traversed. More...

Detailed Description

A halo highlight style.

SoHaloHighlightRenderAction is a render action which renders the specified scene graph, then renders a "halo" highlight around each selected object. See the images below for examples of this highlight technique. Halo highlighting works with all kinds of shapes including VolumeViz and MeshVizXLM. However, if a selected object does not write to the depth buffer for any reason, it will not be highlighted.

Selected objects are specified by the first selection node (SoSelection or SoExtSelection) node in the scene to which this action is applied. If there is no selection node in the scene graph, then no objects will be highlighted.

The application must explicitly tell Open Inventor to use a highlight render action in place of the default SoGLRenderAction in the SoSceneManager class using the setGLRenderAction() method. The viewer classes provide a convenience setGLRenderAction() method that calls SoSceneManager (see e.g. SoWinRenderArea).

For convenience, the viewer classes also provide the redrawOnSelectionChange() method. This method attaches a sensor to the specified selection node and automatically schedules a redraw if the set of selected objects is modified.

Here is an example of an SoAlgebraicCone highlighted with an SoHaloHighlightRenderAction:

Here are parameters that can be adjusted:

• The halo color: see setHaloColor()
• The halo width: see setHaloWidth()
• The halo attenuation factor: see setHaloSmoothFactor()
• Whether or not the halo can be seen through scene objects: see setHaloAlwaysVisible()

NOTES

• The rendering of the halo uses the depth buffer of the selected shapes as its boundary.
• Increasing the halo width value decreases performance.
• When multiple objects are selected, they are highlighted as one unique shape, i.e. the halo is done on the union of their depth buffer. This is illustrated on the following image:

  2 selected objects are highlighted as one

EXAMPLE

Here is an example of how a halo highlight can be specified for a particular selection node and render area:

// Scene graph
SoSelection* selectionNode = new SoSelection();
. . .
// Viewer
SoWinExaminerViewer* viewer = new SoWinExaminerViewer();
viewer->setSceneGraph( selectionNode );
 
// Set the highlight render action
viewer->setGLRenderAction( new SoHaloHighlightRenderAction() );
 
// Request automatic redraw when selection changes
viewer->redrawOnSelectionChange( selectionNode );

SEE ALSO

SoLineHighlightRenderAction, SoColorHighlightRenderAction, SoBoxHighlightRenderAction, SoHighlightRenderAction, SoGLRenderAction, SoSelection, SoWinRenderArea

Definition at line 147 of file SoHaloHighlightRenderAction.h.

Constructor & Destructor Documentation

SoHaloHighlightRenderAction() [1/2]

SoHaloHighlightRenderAction::SoHaloHighlightRenderAction

(

)

SoHaloHighlightRenderAction() [2/2]

SoHaloHighlightRenderAction::SoHaloHighlightRenderAction

(

const SbViewportRegion &

viewportRegion

)

~SoHaloHighlightRenderAction()

virtual SoHaloHighlightRenderAction::~SoHaloHighlightRenderAction ( )

virtual

Member Function Documentation

exitClass()

static void SoHaloHighlightRenderAction::exitClass ( )

static

getClassTypeId()

static SoType SoHaloHighlightRenderAction::getClassTypeId ( )

static

Returns the type identifier for this class.

getHaloColor()

const SbColor & SoHaloHighlightRenderAction::getHaloColor

(

)

const

See setHaloColor()

getHaloSmoothFactor()

float SoHaloHighlightRenderAction::getHaloSmoothFactor

(

)

const

See setHaloSmoothFactor()

getHaloWidth()

int SoHaloHighlightRenderAction::getHaloWidth

(

)

const

See setHaloWidth()

getTypeId()

virtual SoType SoHaloHighlightRenderAction::getTypeId ( ) const

virtual

Returns the type identifier for this specific instance.

Reimplemented from SoHighlightRenderAction.

initClass()

static void SoHaloHighlightRenderAction::initClass ( )

static

isHaloAlwaysVisible()

bool SoHaloHighlightRenderAction::isHaloAlwaysVisible

(

)

const

See setHaloAlwaysVisible()

setHaloAlwaysVisible()

void SoHaloHighlightRenderAction::setHaloAlwaysVisible

(

bool

alwaysVisible

)

Defines whether or not the halo can be seen through objects that are placed in front of selected shapes.

Default is FALSE.

The following images shows an example of halo highlighting with alwaysVisible set to FALSE and TRUE:

alwaysVisible = FALSE	alwaysVisible = TRUE

setHaloColor()

void SoHaloHighlightRenderAction::setHaloColor

(

const SbColor &

color

)

Defines the color of the highlight.

Default is red (1,0,0).

Here are examples of halo highlighting with different colors:

Red	Green	Blue

setHaloSmoothFactor()

void SoHaloHighlightRenderAction::setHaloSmoothFactor

(

float

smoothFactor

)

Defines the amount of alpha attenuation of the halo contour.

Default is 0. The value will be clamped between 0 and 1.

The following images shows an example of halo highlighting with different values for the smooth factor:

smoothFactor = 0	smoothFactor = 0.33	smoothFactor = 0.66	smoothFactor = 1

setHaloWidth()

void SoHaloHighlightRenderAction::setHaloWidth

(

int

width

)

Defines the width of the halo in pixels.

Default is 3.

Only values greater or equal to 1 are accepted. If a value of 0 or lower is given, the effective value will be clamped to 1.

The following images shows an example of halo highlighting with different values for the halo width:

width = 1	width = 3	width = 7	width = 15

---

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

• Inventor/actions/SoHaloHighlightRenderAction.h