public void absoluteLocal() {
        m00 = FastMath.abs(m00);
        m01 = FastMath.abs(m01);
        m02 = FastMath.abs(m02);
        m10 = FastMath.abs(m10);
        m11 = FastMath.abs(m11);
        m12 = FastMath.abs(m12);
        m20 = FastMath.abs(m20);
        m21 = FastMath.abs(m21);
        m22 = FastMath.abs(m22);
    }
Replaces all 9 elements with their absolute values.
jme3-core/src/main/java/com/jme3/math/Matrix3f.java