public static javax.vecmath.Matrix3f convert(com.jme3.math.Matrix3f oldMatrix, javax.vecmath.Matrix3f newMatrix) {
        newMatrix.m00 = oldMatrix.get(0, 0);
        newMatrix.m01 = oldMatrix.get(0, 1);
        newMatrix.m02 = oldMatrix.get(0, 2);
        newMatrix.m10 = oldMatrix.get(1, 0);
        newMatrix.m11 = oldMatrix.get(1, 1);
        newMatrix.m12 = oldMatrix.get(1, 2);
        newMatrix.m20 = oldMatrix.get(2, 0);
        newMatrix.m21 = oldMatrix.get(2, 1);
        newMatrix.m22 = oldMatrix.get(2, 2);
        return newMatrix;
    }
Nice convenience methods for conversion between javax.vecmath and com.jme3.math
Objects, also some jme to jbullet mesh conversion.
@author normenhansen
jme3-jbullet/src/main/java/com/jme3/bullet/util/Converter.java