SoSpotLightDragger.3iv - Man Page

spotlight shaped dragger that allows you to change position, direction, and width of the beam

Inherits from

SoBase > SoFieldContainer > SoNode > SoBaseKit > SoInteractionKit > SoDragger > SoSpotLightDragger


#include <Inventor/draggers/SoSpotLightDragger.h>

Fields from class SoSpotLightDragger:

SoSFRotation rotation

SoSFVec3f translation

SoSFFloat angle

Fields from class SoDragger:

SoSFBool isActive

Fields from class SoInteractionKit:

SoSFEnum renderCaching

SoSFEnum boundingBoxCaching

SoSFEnum renderCulling

SoSFEnum pickCulling

Parts from class SoBaseKit:

(SoNodeKitListPart) callbackList

Methods from class SoSpotLightDragger:


static const SoNodekitCatalog *
getClassNodekitCatalog() const

static SoType getClassTypeId()

Methods from class SoDragger:

void addStartCallback(SoDraggerCB *f, void *userData = NULL)

void removeStartCallback(SoDraggerCB *f, void *userData = NULL)

void addMotionCallback(SoDraggerCB *f, void *userData = NULL)

void removeMotionCallback(SoDraggerCB *f, void *userData = NULL)

void addFinishCallback(SoDraggerCB *f, void *userData = NULL)

void removeFinishCallback(SoDraggerCB *f, void *userData = NULL)

void addValueChangedCallback(SoDraggerCB *f, void *userData = NULL)

void removeValueChangedCallback(SoDraggerCB *f, void *userData = NULL)

SbBool enableValueChangedCallbacks()

void setMinGesture(int pixels)

int getMinGesture() const

static void setMinScale(float newMinScale)

static float getMinScale()

Methods from class SoInteractionKit:

virtual SbBool setPartAsPath(const SbName &partName, SoPath *surrogatePath )

Methods from class SoBaseKit:

virtual const SoNodekitCatalog *
getNodekitCatalog() const

virtual SoNode * getPart(const SbName &partName, SbBool makeIfNeeded)

SbString getPartString(const SoBase *part)

virtual SoNodeKitPath * createPathToPart(const SbName &partName, SbBool makeIfNeeded, const SoPath *pathToExtend = NULL)

virtual SbBool setPart(const SbName &partName, SoNode *newPart)

SbBool set(char *partName, char *parameters)

SbBool set(char *nameValuePairs)

static SbBool isSearchingChildren()

static void setSearchingChildren(SbBool newVal)

Methods from class SoNode:

void setOverride(SbBool state)

SbBool isOverride() const

SoNode * copy(SbBool copyConnections = FALSE) const

virtual SbBool affectsState() const

static SoNode * getByName(const SbName &name)

static int getByName(const SbName &name, SoNodeList &list)

Methods from class SoFieldContainer:

void setToDefaults()

SbBool hasDefaultValues() const

SbBool fieldsAreEqual(const SoFieldContainer *fc) const

void copyFieldValues(const SoFieldContainer *fc, SbBool copyConnections = FALSE)

void get(SbString &fieldDataString)

virtual int getFields(SoFieldList &resultList) const

virtual SoField * getField(const SbName &fieldName) const

SbBool getFieldName(const SoField *field, SbName &fieldName) const

SbBool isNotifyEnabled() const

SbBool enableNotify(SbBool flag)

Methods from class SoBase:

void ref()

void unref() const

void unrefNoDelete() const

void touch()

virtual SoType getTypeId() const

SbBool isOfType(SoType type) const

virtual void setName(const SbName &name)

virtual SbName getName() const

Macros from class SoBaseKit:

SO_GET_PART(kit, partName, partClass)
SO_CHECK_PART(kit, partName, partClass)


SoSpotLightDragger is a composite dragger. It is shaped like a beam of light emanating from a sun-like ball. An arrow runs along the axis of the beam and extends past the end of the beam.

When you click and drag the beam, it opens and closes with an umbrella-like motion. The angle between the center and edge of the beam is stored in the angle field of this dragger; setting the angle field causes the beam to widen or narrow in response. The spotlight dragger does not use a standard dragger class to execute this motion. More details are given later in this section.

Dragging the arrow rotates it arount the sun, and the beam moves with it. The arrow is an SoRotateSphericalDragger that controls the rotation field. See the reference page for SoDirectionalLightDragger, which works the same way, for details.

The sun-shape can be dragged to translate all three pieces together through 3-space. Its movement controls the translation field and works exactly as described in the reference pages for SoDirectionalLightDragger and SoPointLightDragger (which goes into more detail).

Remember: This is not a light source! It just looks like one. If you want to move a light with this dragger, you can do the following:

[a] Use an SoSpotLightManip, which is subclassed from SoLight. It creates an SoSpotLightDragger and uses it as the interface to change the location, direction, and cutOffAngle of its light source (see the SoSpotLightManip man page). The manip also edits the material part of this dragger to match the color of light the manip is producing.

[b] Connect the angle field of this dragger to the cutOffAngle field of an SoSpotLight with a field-to-field connection.

See the SoPointLightDragger and SoDirectionalLightDragger man pages for other ways to control light parameters with the rotation and translation fields.

This class creates its own projector and handles mouse events to do it's own dragging of the beam angle. When the mouse picks a point on the beam, that point is dragged in a circle just like in an SoRotateDiscDragger, but the plane of the disc is re-defined every time a drag is initiated. Imagine placing the metal tip of a compass at the apex of the cone and the pencil tip at the picked point. If you swing an arc through the central axis of the cone, you will be drawing the arc used to drag the beam open and closed.

The beam is opened and closed not by rotating, but by scaling. The dragger scales the beam-cone so that the height and radius change to move the picked point along the circle. Then the angle field is calculated from the height and radius.

You can change the geometry of parts in any instance of this dragger using setPart(). The default part geometries are defined as resources for this SoSpotLightDragger class. They are detailed below in the DRAGGER RESOURCE section. You can make your program use different default resources for the parts by copying the file /usr/share/data/draggerDefaults/spotLightDragger.iv into your own directory, editing the file, and then setting the environment variable SO_DRAGGER_DIR to be a path to that directory.


SoSFRotation rotation
Orientation of the rotating part (an arrow by default).

SoSFVec3f translation
Position of the dragger.

SoSFFloat angle
Angle between center and edge of beam.



static const SoNodekitCatalog *
getClassNodekitCatalog() const
Returns an SoNodekitCatalog for this class

static SoType getClassTypeId()
Returns type identifier for this class.

Catalog Parts

All parts
Part NamePart TypeDefault TypeDefault
Extra information for list parts from above table
Part NameContainer TypePermissible Types
callbackListSeparatorCallback, EventCallback

Dragger Resources

.in 0n+.5i

Resource: spotLightBeam
.in 0n+.5i
Part: beam
Appearance: wire-frame cone with no SoMaterial node
Description: picking this initiates dragging of the beam angle. The beam inherits colors from the material part, just like the stationary version of the sun shape.

.in 0n+.5i
Resource: spotLightBeamActive
.in 0n+.5i
Part: beamActive
Appearance: yellow wire-frame cone
Description: displayed during dragging of the beam angle.

.in 0n+.5i
Resource: spotLightBeamPlacement
.in 0n+.5i
Part: beamPlacement
Appearance: translation of (0,0,-1)
Description: This translation node moves the beam parts relative to the rest of the dragger. In this case, moving by (0,0,-1) slides the cone outward along rotator part toward its arrow-head. The distance chosen places the apex of the cone on the surface of the sun shape.

.in 0n+.5i
Resource: spotLightRotatorRotator
.in 0n+.5i
Part: rotator.rotator
Appearance: white arrow that goes through the sun
Description: picking this begins rotation of the arrow about the sun-shape

.in 0n+.5i
Resource: spotLightRotatorRotatorActive
.in 0n+.5i
Part: rotator.rotatorActive
Appearance: yellow arrow that goes through the sun
Description: displayed while the arrow is being rotated

.in 0n+.5i
Resource: spotLightRotatorFeedback
.in 0n+.5i
Appearance: empty Separator
Description: this disables display of the axes that a rotateSpherical dragger uses by default

.in 0n+.5i
Resource: spotLightRotatorFeedbackActive
.in 0n+.5i
Part: rotator.feedbackActive
Appearance: empty Separator
Description: this disables display of the axes that a rotateSpherical dragger uses by default

.in 0n+.5i
Resource: spotLightOverallMaterial
.in 0n+.5i
Part: material
Appearance: white. half strength emissive, half strength diffuse
Description: sets material for the sun shape when stationary. Resource for the moving sun, spotLightTranslatorPlaneTranslatorActive, contains a yellow material for highlighting.

.in 0n+.5i
Resource: spotLightTranslatorPlaneTranslator
.in 0n+.5i
Parts: translator.yzTranslator.translator
Appearance: sun shape with no material
Description: picking these parts initiates dragging by the yz, xz, and xy planar draggers respectively.

.in 0n+.5i
Resource: spotLightTranslatorPlaneTranslatorActive
.in 0n+.5i
Parts: translator.yzTranslator.translatorActive
Appearance: yellow sun shape
Description: shown during planar dragging in the yz, xz, and xy planes respectively.

.in 0n+.5i
Resource: spotLightTranslatorLineTranslator
.in 0n+.5i
Parts: translator.xTranslator.translator
Appearance: white cylinder
Description: picking these parts initiates dragging in the x, y, and z linear draggers respectively.

.in 0n+.5i
Resource: spotLightTranslatorLineTranslatorActive
.in 0n+.5i
Parts: translator.xTranslator.translatorActive
Appearance: yellow cylinder
Description: shown during linear dragging in the x, y, and z directions respectively.

File Format/Defaults

SpotLightDragger {
renderCaching	AUTO
boundingBoxCaching	AUTO
renderCulling	AUTO
pickCulling	AUTO
isActive	FALSE
rotation	0 0 1  0
translation	0 0 0
angle	1
callbackList	NULL
material	<spotLightOverallMaterial resource>
translator	DragPointDragger {

rotator	RotateSphericalDragger {

beamPlacement	<spotLightBeamPlacement resource>
beamScale	Scale {
    scaleFactor 0.841471 0.841471 0.540302 }

beam	<spotLightBeam resource>
beamActive	<spotLightBeamActive resource>
rotator.rotator	<spotLightRotatorRotator resource>
rotator.rotatorActive	<spotLightRotatorRotatorActive resource>	<spotLightRotatorFeedback resource>
rotator.feedbackActive	<spotLightRotatorFeedbackActive resource>
translator.yzTranslator.translator	<spotLightTranslatorPlaneTranslator resource>
translator.xzTranslator.translator	<spotLightTranslatorPlaneTranslator resource>
translator.xyTranslator.translator	<spotLightTranslatorPlaneTranslator resource>
translator.yzTranslator.translatorActive	<spotLightTranslatorPlaneTranslatorActive resource>
translator.xzTranslator.translatorActive	<spotLightTranslatorPlaneTranslatorActive resource>
translator.xyTranslator.translatorActive	<spotLightTranslatorPlaneTranslatorActive resource>
translator.xTranslator.translator	<spotLightTranslatorLineTranslator resource>
translator.yTranslator.translator	<spotLightTranslatorLineTranslator resource>
translator.zTranslator.translator	<spotLightTranslatorLineTranslator resource>
translator.xTranslator.translatorActive	<spotLightTranslatorLineTranslatorActive resource>
translator.yTranslator.translatorActive	<spotLightTranslatorLineTranslatorActive resource>
translator.zTranslator.translatorActive	<spotLightTranslatorLineTranslatorActive resource>

See Also

SoInteractionKit, SoDragger, SoCenterballDragger, SoDirectionalLightDragger, SoDragPointDragger, SoHandleBoxDragger, SoJackDragger, SoPointLightDragger, SoRotateCylindricalDragger, SoRotateDiscDragger, SoRotateSphericalDragger, SoScale1Dragger, SoScale2Dragger, SoScale2UniformDragger, SoScaleUniformDragger, SoTabBoxDragger, SoTabPlaneDragger, SoTrackballDragger, SoTransformBoxDragger, SoTransformerDragger, SoTranslate1Dragger, SoTranslate2Dragger