Sets or returns the X3DObject acting as the UpVector reference.
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' This example creates a constraint and sets its upvector reference.
'
NewScene , false
set oRoot = Application.ActiveProject.ActiveScene.Root
set oNull = oRoot.AddNull("ConstrainingNull")
set oNull2 = oRoot.AddNull("UpVectorReference")
set oGrid = oRoot.AddGeometry("Grid","MeshSurface")
set oDirectionCns = oGrid.Kinematics.AddConstraint("Direction", oNull )
oDirectionCns.Parameters("upvct_active").Value = True
set oDirectionCns.UpVectorReference = oNull2
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