[JAVA3D] AxisAngle.set(Matrix3d) incorrect for rotation of PI

[Peter Balmforth]

AxisAngle4f.set(Matrix3d) sets the wrong values when the rotation
is PI about the Y axis. I think it will occur with some of the
similar combinations of classes as well.

The following bit of code demonstrates it. Because the
rotation is PI the method assumes it is an identity matrix
and defaults the axis angle to (0.0,1.0,0.0,0.0) when it should be
(0.0,1.0,0.0,3.1459).

import javax.vecmath.*;

public class TestAxisAngle
{
  public static void main(String []args)
  {
    Matrix3d rotation = new Matrix3d();
    rotation.rotY(Math.PI);

    AxisAngle4f orientation = new AxisAngle4f();
    orientation.set( rotation );

    System.out.println( "Rotation=" + rotation.toString() );
    System.out.println( "Orientation=" + orientation.toString() );
  }
}

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