public Vector3f cross(Vector2f v) {
        return new Vector3f(0, 0, determinant(v));
    }
Calculates a cross product with the argument and returns the product as a
new instance. The current instance is unaffected.

@param v the right factor (not null, unaffected)
@return {@code this} cross {@code v} (a new Vector3f)
jme3-core/src/main/java/com/jme3/math/Vector2f.java