public Camera.FrustumIntersect getLastFrustumIntersection() {
        return frustrumIntersects;
    }
Returns this spatial's last frustum intersection result. This int is set
when a check is made to determine if the bounds of the object fall inside
a camera's frustum. If a parent is found to fall outside the frustum, the
value for this spatial will not be updated.

@return The spatial's last frustum intersection result.
jme3-core/src/main/java/com/jme3/scene/Spatial.java