private boolean valid() {
        if (actors == null) {
            return false;
        }
        if ((spawningPositions == null) || (spawningPositions.size() < 1)) {
            return false;
        }
        if (name == null) {
            return false;
        }
        if (skybox == null) {
            return false;
        }
        
        return true;
    }