SoDirectionalLightDragger is a composite dragger. It looks like a sun with a large arrow coming out of it. The arrow can be rotated about the sun by dragging with the mouse; its orientation is given by the rotation field. You can also drag the sun (and the arrow with it) through 3-space. The location is stored in the translation field.

The dragger uses an SoRotateSphericalDragger for changing the rotation. Instead of using the default spherical geometry, this dragger uses an arrow shape.

The sun is an SoDragPointDragger. Dragging it edits the translation field; conversely, if you change the translation field the sun will move to that new location, bringing the arrow with it. The sun looks and behaves just like the sun in an SoPointLightDragger, as does the material part. See the SoPointLightDragger reference page for details.

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

• Use an SoDirectionalLightManip, which is subclassed from SoLight. It creates an SoDirectionalLightDragger and uses it as the interface to change the direction of its light source (see the SoDirectionalLightManip reference page). The manipulator also edits the material part of this dragger to match the color of light the manipulator is producing. However, the directional light manipulator will ignore the translation field, because a directional light has no location or translation field. So in this case the translation dragger merely allows you to move the physical arrow to wherever you'd like it to be.

• Put an SoTransform under an SoTransformSeparator. Add the SoDirectionalLight as the next child. Use a field-to-field connection between the rotation fields of this dragger and the transform node to synchronize the light with this dragger.

• Use engines to connect the rotation field of this dragger to the direction field of an SoDirectionalLight. Use the rotation as input to an SoComposeMatrix engine. Then, use an SoTransformVec3f engine to apply that matrix to (0,0,-1), the default light direction.

You can change the parts in any instance of this dragger using setPart(). The default part geometries are defined as resources for this SoDirectionalLightDragger class. They are detailed in the Dragger Resources section of the online reference page for this class. You can make your program use different default resources for the parts by copying the file $OIVHOME/data/draggerDefaults/directionalLightDragger.iv into your own directory, editing the file, and then setting the environment variable SO_DRAGGER_DIR to be a path to that directory.

See SoDragger for more information about using and customizing draggers, including code examples, using draggers in an immersive VR environment and using WYSIWYG draggers.

FILE FORMAT/DEFAULT

DirectionalLightDragger {

renderCaching	AUTO
boundingBoxCaching	AUTO
renderCulling	AUTO
pickCulling	AUTO
isActive	false
translation	0 0 0
rotation	0 0 1 0
callbackList	NULL
material	<directionalLightOverallMaterial resource>
translatorRotInv	NULL
translator	DragPointDragger {
	}
rotator	RotateSphericalDragger {
	}
rotator.rotator	<directionalLightRotatorRotator resource>
rotator.rotatorActive	<directionalLightRotatorRotatorActive resource>
rotator.feedback	<directionalLightRotatorFeedback resource>
rotator.feedbackActive	<directionalLightRotatorFeedbackActive resource>
translator.yzTranslator.translator	<directionalLightTranslatorPlaneTranslator resource>
translator.xzTranslator.translator	<directionalLightTranslatorPlaneTranslator resource>
translator.xyTranslator.translator	<directionalLightTranslatorPlaneTranslator resource>
translator.yzTranslator.translatorActive	<directionalLightTranslatorPlaneTranslatorActive resource>
translator.xzTranslator.translatorActive	<directionalLightTranslatorPlaneTranslatorActive resource>
translator.xyTranslator.translatorActive	<directionalLightTranslatorPlaneTranslatorActive resource>
translator.xTranslator.translator	<directionalLightTranslatorLineTranslator resource>
translator.yTranslator.translator	<directionalLightTranslatorLineTranslator resource>
translator.zTranslator.translator	<directionalLightTranslatorLineTranslator resource>
translator.xTranslator.translatorActive	<directionalLightTranslatorLineTranslatorActive resource>
translator.yTranslator.translatorActive	<directionalLightTranslatorLineTranslatorActive resource>
translator.zTranslator.translatorActive	<directionalLightTranslatorLineTranslatorActive resource>

}

DRAGGER RESOURCES

Resource:	directionalLightRotatorRotator
Part:	rotator.rotator
Appearance:	white arrow that goes through the sun
Description:	picking this begins rotation of the arrow about the sun-shape
Resource:	directionalLightRotatorRotatorActive
Part:	rotator.rotatorActive
Appearance:	yellow arrow that goes through the sun
Description:	displayed while the arrow is being rotated
Resource:	directionalLightRotatorFeedback
Part:	rotator.feedback
Appearance:	empty Separator
Description:	this disables display of the axes that a rotateSpherical dragger uses by default
Resource:	directionalLightRotatorFeedbackActive
Part:	rotator.feedbackActive
Appearance:	empty Separator
Description:	this disables display of the axes that a rotateSpherical dragger uses by default
Resource:	directionalLightOverallMaterial
Part:	material
Appearance:	white. half strength emissive, half strength diffuse
Description:	sets material for the sun shape when stationary. Resource for the moving sun, directionalLightTranslatorPlaneTranslatorActive, contains a yellow material for highlighting.
Resource:	directionalLightTranslatorPlaneTranslator
Parts:	translator.yzTranslator.translator<BR> translator.xzTranslator.translator<BR> translator.xyTranslator.translator
Appearance:	sun shape with no material
Description:	picking these parts initiates dragging by the yz, xz, and xy planar draggers respectively.
Resource:	directionalLightTranslatorPlaneTranslatorActive
Parts:	translator.yzTranslator.translatorActive<BR> translator.xzTranslator.translatorActive<BR> translator.xyTranslator.translatorActive
Appearance:	yellow sun shape
Description:	shown during planar dragging in the yz, xz, and xy planes respectively.
Resource:	directionalLightTranslatorLineTranslator
Parts:	translator.xTranslator.translator<BR> translator.yTranslator.translator<BR> translator.zTranslator.translator
Appearance:	white cylinder
Description:	picking these parts initiates dragging in the x, y, and z linear draggers respectively.
Resource:	directionalLightTranslatorLineTranslatorActive
Parts:	translator.xTranslator.translatorActive<BR> translator.yTranslator.translatorActive<BR> translator.zTranslator.translatorActive
Appearance:	yellow cylinder
Description:	shown during linear dragging in the x, y, and z directions respectively.

CATALOG PARTS

All Parts

Part Name	Part Type	Default Type	NULL Default
callbackList	NodeKitListPart		yes
material	Material		yes
translatorRotInv	Rotation		yes
translator	DragPointDragger		yes
rotator	RotateSphericalDragger		yes

Extra Information for List Parts from Above Table

Part Name	Container Type	Possible Types
callbackList	Separator	Callback; EventCallback

Reference