gistfile1.txt

    public static void main(String[] args) throws Exception {
        File packingGen = new File(System.getProperty("user.dir"), "packing.xyzd." + System.currentTimeMillis());
        if(!packingGen.exists()) {
            packingGen.createNewFile();
        }
        FileOutputStream fos = new FileOutputStream(packingGen);
        fos.write(generatePacking());
        fos.close();
    }

    private static byte[] generatePacking() {
        int particles = 600;
        double min = 10, max = 50;
        int maxX = 200, maxY = 250, maxZ = 200;
        Random r = new Random();
        ByteBuffer buf = ByteBuffer.allocate(4 * 8 * particles).order(ByteOrder.LITTLE_ENDIAN);
        for (int i = 0; i < particles; i++) {
            double rad = min + ((max - min) * r.nextDouble());
            double posX = min + ((maxX - (min * 2)) * r.nextDouble());
            double posY = min + ((maxY - (min * 2)) * r.nextDouble());
            double posZ = min + ((maxZ - (min * 2)) * r.nextDouble());
            buf.putDouble(posX).putDouble(posY).putDouble(posZ).putDouble(rad);
        }
        return buf.array();
    }