public void zeroLessThan(float cutOff) {
        for(int i=0; i < data.length; i++) {
            double[] block = data[i];
            for(int j=0; j < block.length; j++) {
                if (block[j] != 0.0f && block[j] < cutOff) block[j] = 0.0f;
            }
        }
    }