public float determinant() {
        float fCo00 = m11 * m22 - m12 * m21;
        float fCo10 = m12 * m20 - m10 * m22;
        float fCo20 = m10 * m21 - m11 * m20;
        float fDet = m00 * fCo00 + m01 * fCo10 + m02 * fCo20;
        return fDet;
    }
Returns the determinant. The matrix is unaffected.

@return the determinant
jme3-core/src/main/java/com/jme3/math/Matrix3f.java