OIV.Inventor.Draggers.SoCenterballDragger is a composite dragger. Its shape is a sphere defined by three intersecting circles. Where the circles intersect (at the ends of the x, y and z axes) there are sets of small green crosshairs. Dragging a pair of crosshairs translates the entire centerball within the plane of the crosshairs. The interface of the sphere and circles is just like OIV.Inventor.Draggers.SoTrackballDragger. Dragging a circle rotates about a constrained axis and dragging the areas between them rotates the sphere freely about the center. An invisible but pickable sphere initiates the free-rotation dragging.

When you drag the crosshairs, the OIV.Inventor.Draggers.SoCenterballDragger.center field is updated; there is no translation field. Dragging other parts of the centerball updates the OIV.Inventor.Draggers.SoCenterballDragger.rotation field. As with all draggers, if you change the fields the dragger moves in response.

The draggers used for the crosshair parts are SoTranslate2Draggers, so pressing the <Shift> key allows you to constrain motion to slide along either the local x axis or y axis of that crosshair. The direction is determined by your initial mouse gesture after pressing the key. Releasing the key removes the constraint.

Remember: This is not an SoTransform! If you want to move other objects with this dragger, you can either:

• Use an OIV.Inventor.Manips.SoCenterballManip, which is subclassed from OIV.Inventor.Nodes.SoTransform. The manipulator creates one of these draggers and uses it as the interface to edit the manipulator's fields. (See the OIV.Inventor.Manips.SoCenterballManip reference page.)

• Use field-to-field connections to connect the fields of this dragger to those of any OIV.Inventor.Nodes.SoTransformation node.

You can change the parts in any instance of this dragger using OIV.Inventor.Nodekits.SoBaseKit.SetPart(System.String, OIV.Inventor.Nodes.SoNode). The default part geometries are defined as resources for this OIV.Inventor.Draggers.SoCenterballDragger 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/centerballDragger.iv into your own directory, editing the file, and then setting the environment variable SO_DRAGGER_DIR to be a path to that directory.

This dragger has both a default and a WYSIWYG version:

Default Dragger	WYSIWYG Dragger

FILE FORMAT/DEFAULT

CenterballDragger {

boundingBoxCaching	AUTO
renderCulling	AUTO
pickCulling	AUTO
isActive	false
rotation	0 0 1 0
center	0 0 0
callbackList	NULL
translateToCenter	MatrixTransform {
	matrix
	1 0 0 0
	0 1 0 0
	0 0 1 0
	0 0 0 1
	}
surroundScale	NULL
antiSquish	AntiSquish {
	sizing LONGEST_DIAGONAL
	}
lightModel	LightModel {
	model PHONG
	}
XAxis	<centerballXAxis resource>
YAxis	<centerballYAxis resource>
ZAxis	<centerballZAxis resource>
rotator	RotateSphericalDragger {
	}
YRotator	RotateCylindricalDragger {
	}
ZCenterChanger	Translate2Dragger {
	}
ZRotator	RotateCylindricalDragger {
	}
YCenterChanger	Translate2Dragger {
	}
XCenterChanger	Translate2Dragger {
	}
XRotator	RotateCylindricalDragger {
	}
rotator.rotator	<centerballRotator resource>
rotator.rotatorActive	<centerballRotatorActive resource>
XRotator.rotator	<centerballStripe resource>
YRotator.rotator	<centerballStripe resource>
ZRotator.rotator	<centerballStripe resource>
XRotator.rotatorActive	<centerballStripeActive resource>
YRotator.rotatorActive	<centerballStripeActive resource>
ZRotator.rotatorActive	<centerballStripeActive resource>
XCenterChanger.translator	<centerballCenterChanger resource>
YCenterChanger.translator	<centerballCenterChanger resource>
ZCenterChanger.translator	<centerballCenterChanger resource>
XCenterChanger.translatorActive	<centerballCenterChangerActive resource>
YCenterChanger.translatorActive	<centerballCenterChangerActive resource>
ZCenterChanger.translatorActive	<centerballCenterChangerActive resource>
XCenterChanger.xAxisFeedback	<centerballCenterXAxisFeedback resource>
YCenterChanger.xAxisFeedback	<centerballCenterXAxisFeedback resource>
ZCenterChanger.xAxisFeedback	<centerballCenterXAxisFeedback resource>
XCenterChanger.yAxisFeedback	<centerballCenterYAxisFeedback resource>
YCenterChanger.yAxisFeedback	<centerballCenterYAxisFeedback resource>
ZCenterChanger.yAxisFeedback	<centerballCenterYAxisFeedback resource>

}

DRAGGER RESOURCES

Resource:	centerballRotator
Part:	rotator.rotator
Appearance:	Invisible but pickable sphere
Description:	When picked, initiates free rotation about the center point. Slightly smaller radius than the stripes, so you must pick between the stripes to use it.
Resource:	centerballRotatorActive
Part:	rotator.rotatorActive
Appearance:	Invisible sphere
Description:	Displayed during unconstrained 3D rotation instead of centerballRotator.
Resource:	centerballStripe
Parts:	XRotator.rotator<BR> YRotator.rotator<BR> ZRotator.rotator
Appearance:	White circle aligned with rotation axis.
Description:	When picked, initiates constrained rotation. Each rotator rotates locally about its Y axis. The centerball contains private transform parts that orient the draggers along three different axes.
Resource:	centerballStripeActive
Parts:	XRotator.rotatorActive<BR> YRotator.rotatorActive<BR> ZRotator.rotatorActive
Appearance:	White circle aligned with the rotation axis.
Description:	Displayed during constrained rotation instead of the rotator part. The centerball orients the draggers along three different axes.
Resource:	centerballCenterChanger
Parts:	XCenterChanger.translator<BR> YCenterChanger.translator<BR> ZCenterChanger.translator
Appearance:	Two sets of small green crosshairs, one located at each intersection of axis and ball.
Description:	When picked, initiates 2D translation of ball through space. Edits the OIV.Inventor.Draggers.SoCenterballDragger.center field, which becomes center for subsequent rotations. Each translator works locally in its X-Y plane. The centerball containsprivate transform parts that place the draggers along three different axes.
Resource:	centerballCenterChangerActive
Parts:	XCenterChanger.translatorActive<BR> YCenterChanger.translatorActive<BR> ZCenterChanger.translatorActive
Appearance:	Yellow version of centerballCenterChanger.
Description:	Displayed during 2D translation instead of regular translator part. The centerball places the draggers along three different axes.
Resource:	centerballCenterXAxisFeedback
Parts:	XCenterChanger.xAxisFeedback<BR> YCenterChanger.xAxisFeedback<BR> ZCenterChanger.xAxisFeedback
Appearance:	Double-headed purple arrows, one located at each intersection of axis and ball. Located atop X axis of crosshair.
Description:	Only shown if dragger is moving and the axis is a permitted direction of motion. When pressing <shift>, motion is constrained, and this is displayed only if the primary motion is in the X direction of the child dragger's local space. The centerball places the draggers along three different axes; so not all of these parts aligns with the X axis in centerball space.
Resource:	centerballCenterYAxisFeedback
Parts:	XCenterChanger.yAxisFeedback<BR> YCenterChanger.yAxisFeedback<BR> ZCenterChanger.yAxisFeedback
Appearance:	Double-headed purple arrows, one located at each intersection of axis and ball. Located atop Y axis of crosshair.
Description:	Only shown if dragger is moving and the axis is a permitted direction of motion. When pressing <shift>, motion is constrained, and this is displayed only if the primary motion is in the Y direction of the child dragger's local space. The centerball places the draggers along three different axes; so not all of these parts aligns with the Y axis in centerball space.
Resource:	centerballXAxis
Part:	XAxis
Appearance:	Thin yellow line connecting left and right crosshairs.
Description:	Feedback shown alone during rotation about X axis; displayed with centerballYAxis and centerballZAxis while center is dragged.
Resource:	centerballYAxis
Part:	YAxis
Appearance:	Thin yellow line connecting lower and upper crosshairs.
Description:	Feedback shown alone during rotation about Y axis; displayed with centerballXAxis and centerballZAxis while center is dragged.
Resource:	centerballZAxis
Part:	ZAxis
Appearance:	Thin yellow line connecting near and far crosshairs.
Description:	Feedback shown alone during rotation about Z axis; displayed with centerballXAxis and centerballYAxis while center is dragged.

CATALOG PARTS

All Parts

Part Name	Part Type	Default Type	NULL Default
callbackList	NodeKitListPart		yes
translateToCenter	MatrixTransform		yes
surroundScale	SurroundScale		yes
antiSquish	AntiSquish		no
lightModel	LightModel		yes
XAxis	Separator		yes
YAxis	Separator		yes
ZAxis	Separator		yes
rotator	RotateSphericalDragger		yes
YRotator	RotateCylindricalDragger		yes
ZCenterChanger	Translate2Dragger		yes
ZRotator	RotateCylindricalDragger		yes
YCenterChanger	Translate2Dragger		yes
XCenterChanger	Translate2Dragger		yes
XRotator	RotateCylindricalDragger		yes

Extra Information for List Parts from Above Table

Part Name	Container Type	Possible Types
callbackList	Separator	Callback, EventCallback

Reference