public void inverseTranslateVect(float[] vec) {
        if (vec.length != 3) {
            throw new IllegalArgumentException(
                    "vec must be of size 3.");
        }

        vec[0] = vec[0] - m03;
        vec[1] = vec[1] - m13;
        vec[2] = vec[2] - m23;
    }
Inverse translate the specified vector using the translation component of
this 3-D coordinate transform.

@param vec the vector to translate (not null, length=3, modified)
@throws IllegalArgumentException if vec doesn't have length=3.
jme3-core/src/main/java/com/jme3/math/Matrix4f.java