here is the Constructor of PositionPathInterpolator:

PositionPathInterpolator(Alpha alpha, TransformGroup target, Transform3D axisOfTransform, float[] knots, Point3f[] positions)

what's the true mean of param axisOfTransform in this
constructor?Does it represent a Axis?

if Transform3D t3d = new Transform3D();

t3d.setTranslation(new Vector3f(1.0f,0.0f,0.0f);

then i pass t3d to param axisOfTransform.Will the object
in transformgroup transform along X axis?

Hope somebody can help me.