public static com.jme3.math.Matrix3f convert(javax.vecmath.Matrix3f oldMatrix, com.jme3.math.Matrix3f newMatrix) {
        newMatrix.set(0, 0, oldMatrix.m00);
        newMatrix.set(0, 1, oldMatrix.m01);
        newMatrix.set(0, 2, oldMatrix.m02);
        newMatrix.set(1, 0, oldMatrix.m10);
        newMatrix.set(1, 1, oldMatrix.m11);
        newMatrix.set(1, 2, oldMatrix.m12);
        newMatrix.set(2, 0, oldMatrix.m20);
        newMatrix.set(2, 1, oldMatrix.m21);
        newMatrix.set(2, 2, oldMatrix.m22);
        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