P2P-Links to highres Texture rawmaterial?

[Slalomsk8er]

What so you think of the idee to put the bluemarble and other publicdomain highres Images from NASA (wich are just available by mailrequest) and others into a P2Pnet (eMule etc.) and poste the Links (ed2k etc.) into this forum?

benefits:

NASA and others:


less bandwithusage
Us:


one locaton to go (maybe a sticky thread in this forum)

fast download (if all who downloaded it let it in a shared folder)

the P2Pclients check the correctness of the files against a hash (MD5?)

thanks to the links you will get what you want (works with the hash not the name of the file)

here an exemple:

The moon as a 2880 X 1440 TGA made from Earth and Moon Viewer tiles
ed2k://|file|moon.tga|15836007|E1D48E3F247C0266306F582A7CB00A26|/

Greetings from Swiss

[Slalomsk8er]

50 views no feedback or vote, I am unable to understand this

As I looked into 3D and space stuff I found it quite hard to get usable material for higres textures (first for Blender).
I have spend a lot of days searching in google and others (now I know where I have to look but it is still not easy to find the stuff an the NASA etc. Servers and they are using old FTP-versions)!

Now I am downloading the 128pixel per deree Mars topo data from ftp://pds-geosciences.wustl.edu/geodata/mgs-m-mola-5-megdr-l3-v1/mgsl_300x/meg128/
and put it into rarfiles (33% of original size with no loss) and I have no chance to see how much percent of one file is downloaded cuz of old FTP-Servers plus I have to convert the Images for general use (can you use *.img in pds raw format?).

Highresolution textures are hard enough to do.
How to get the raw material shouldn't need a day or two searching for an answer!!!

[selden]

Slalomsk8er,

There are many non-technical problems with p2p networks. One is that you don't know what you're getting. The file you're downloading could have been intentionally corrupted by someone, for example: it's a popular way to distribute viruses and trojan horses

That's one of the reasons why getting files from a trusted server is better.

You might want to consider contacting the MotherLode folks and asking that they host some of the files you're interested in.

[Slalomsk8er]

Your are right you don't know what you will get if you search for moon.tga.

But afaIk there is no way to crack the hash calculated from the file (put a corrupted file on the Net with the same hash).

If you have eMule and click on my moon.tga-ed2k-Link you will get chunk for chunk exactly my moon.tga checked for corectness (if there is a virus in it, my f***** wintendo is to blame). Even if my "original" get altered (virus etc.) by clicking on the link above you will download the original from other sources (I the file was spreed throu the Net).

So if we use ed2k-Links just one can corrupt the file (the poster it self) and he has to do it before he hashes the file (tell eMule and co. to make a link).

The question is not can I trust P2P, it is can I trust this Forum


PS:

1. If you plan to check P2P out make sure there is an updated (once per day) antivirusprogram an your wintendo, there is no real need for uncommon Operatingsystems as 99% of the virus are writen for windows but I still recomed it.

2. Do NOT share your hole Computer (make a folder put all you want to share into it and share the folder and subfolder if needed)

3. Trust NO file you searched by NAME but if you can trust your friend and he put a file in to the P2P-Network plus gave you the ed2k-Link you CAN trust the file it will download. So if you want a file do not search for it by name insted get the hash an search for it by hash.

Happy Downloading

[Bob Hegwood]

Just a negative vote from the Brain-Dead...

My reasons involve the added complications which arise from having to
use yet *another* form of download and software, etc...

I'm with Selden. Place these items on the Celestia MotherLode where they
can be easily FOUND, and easily downloaded.

Just my opinion, sorry.

Thanks, Bob

[Slalomsk8er]

What sort of connection is the MotherLode-Server using?
How big is the free disk space on MotherLode?
How do they handle backups?

Don't feel sorry mr. Brain-Dead your opinion is valid and i will place these items on the MotherLode if they have the free space needed.

But I like the decentralisation of P2P. It has to go wrong at a hundred places bevore a file is getting lost (if a hundred seeders are on the Net).

Thanks, Dominik

[selden]

The Celestia Motherlode is hosted by ibiblio.

System specs are at http://www.ibiblio.org/systems/infrastructure.html

They have about 3 TeraBytes of storage. They don't publish how much is in use or how big a pipe they have to the commercial internet. It's big, though: they're currently serving about 250Mbits/sec.

[Rassilon]

In my opinion if you plan to ever use p2p, dont...Use BitTorrent instead...

[Slalomsk8er]

selden, I bet in a bit of time ibiblio needs a Tera more just for us

Rassilon, what are you thinking is BitTorrents work concept?

right it is P2P

BitTorrent is yust an other flavor of P2P!

http://bitconjurer.org/BitTorrent/introduction.html

I used eMule as exemple because I have it and know how to use it.

Maybe you are right and we would be better served with BitTorrent then eMule.

eMule

pro: I have it

con: it do not send the fin signal if the connection gets lost.
This can cause DoS on your router if you close eMule because the ca. 200 connections are still open but the router finds no one in the LAN to be the endpoint.
So he thinks this must be an attack and refuse to work.
The other acpect is, the timeout for TCP/IP is normaly at 2 hours this plus eMule want to have ca. 200 working connections can leed to:

(all connections lost in the last 2 hours) + (all active connections)
= max connections your router can menage (cheep NAT router 256 connections)
= no free connections
= no internet exept eMule

BitTorrent

pro: ?

con: ?

Thanks, Dominik

[griever0]

One aspect of P2P that I find very attractive is the ability to resume downloads reliably. In my experience, download managers (such as Getright), produce the occasional corrupt download. As a dial up user in Thailand, disconnections happen worryingly often, and the prospect of waiting hours for a corrupt download is not very desirable. The P2P programs I'm familiar with have really reliable hash checking functions, allowing me to stop and resume downloads without worry.

I personally favor BitTorrent as a distribution method.

[Guest]

I voted no, because in certains countries the P2P users hunting is started.

For example, in France (20 P2P users sentenced the last months)

And that seems general.

Take a look at this link about XP SP2

http://www.speedguide.net/read_articles.php?id=1497

[phoenix]

erm.... P2P is in NO WAY illegal, except if you share illegal content such as copyright protected movies & music.

i'm 100% sure public self-made textures for celestia are not illegal to share and p2p is a very good way to spread them

don't be afraid of p2p ... it's just another (very effecient) method of dowloading things...

*vote 4 bittorrent*

[Slalomsk8er]

I have found just one negativ point in bittorrent and this is you have to restart all downloads manually (not shure for uploads) after a reboot/restart of the computer.

But besides that, it looks like bittorrent will make it over the rest of the P2P proggis.

Thanks, Dominik