AI


The X-ray engine uses GSC Gameworld's proprietary ALife artificial intelligence engine. ALife supports more than one thousand characters inhabiting the Zone. These characters are non-scripted, meaning that AI life can be developed even when not in contact with the player.

The NPCs have a full life cycle (task accomplishment, combat, rest, feeding and sleep) and the same applies to the many monsters living in the Zone (hunting, attacking Stalkers and other monsters, resting, eating, sleeping). These monsters will migrate in large groups. The non-scripted nature of the characters means that there are an unlimited number of random quests. For instance, rescuing Stalkers from danger, destroying Stalker renegades, protecting or attacking Stalker camps or searching for treasure. The AI characters travel around the entire zone as they see fit.

Numerous tactics can be employed to complete the game, such as rushing or using stealth and sniping. The NPCs will react in a different way to each of them. S.T.A.L.K.E.R.'s NPCs plan ahead by "Goal-Oriented Action Planning" in order to achieve this.

Bullet physics


S.T.A.L.K.E.R. uses "realistic" bullet physics, similar in nature to tactical shooters such as Ghost Recon Advanced Warfighter or Operation Flashpoint. Bullets are affected by gravity, bounced against solid surfaces at oblique angles, and firearms are highly inaccurate when fired without aiming. To score consistent hits at medium or long range, players must aim using the iron sights
on their guns. Additionally, hit damage is pseudo-realistic, and the player can die after only being shot a few times (although later in the game various armor suits and artifacts can be acquired that increase the player's resistance to damage). Late-game depends heavily on scoped weaponry due to the well-armed and powerful enemies that keep their distance from the player.

Physics


S.T.A.L.K.E.R. uses a heavily modified version of the ODE physics engine, supporting hundreds of physics objects on different levels. Ragdoll physics, destructible objects, realistic bullet ballistics and skeletal animation can all be found in the game.

Weather


A weather system is integrated into various parts of the landscape and allows a variety of weather effects, such as sunshine, storms and showers. The weapons available, behavior of the AI, game tactics and ranking systems will depend on the weather.

For more direct specifications, check the engine's homepage.

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Blog RSS Feed Report abuse Latest News: STALKER Clear Sky music... and more.

About S.T.A.L.K.E.R.: Clear Sky with 3 comments by Sclera on Mar 29th, 2011

Allow me to direct your attention to three mods I have recently completed:

1. Clear Sky Music Overhaul


After a few weeks of work and minimal trouble, it's all done. Most of the game's original music has been discarded, since a lot of it was borrowed from Shadow of Chernobyl. Limansk, The Hospital and CNPP remain untouched, but everywhere else gets a bunch of new music. About 59 minutes of music were composed, and (perhaps hypocritically) I borrowed some music from my Shadow of Chernobyl mod as well.

Video preview:



2. Anomaly Sound Replacement for Shadow of Chernobyl


Borne not out of an apparent need for new sounds, but purely out of creative boredom, this mod replaces the most commonly heard anomaly sounds in the game. It gives the game a fresh feel without ruining the intended atmosphere. Also, if you are a mod developer and wish to include these in your mod, please do so, and let me know of course.

Video preview:


3. Interface Mod for Shadow of Chernobyl

I never intended to release this, initially. It started out as a lot of different things I was changing for myself, and ended up being a culmination of these things in a neat little package. The idea of the visual aspect of this mod was to eliminate most of the clutter on-screen, and remove superfluous or immersion-breaking information. On the gameplay screen you can see your health, stamina, current ammo and fire-mode; no, there's no map. That's how I like it (try not to feel tempted to check your Contacts for nearby enemies... I swear I don't do it).

You're given several options here; 2 health bars, 3 cursors, 4 PDAs, and 3 sets of PDA sounds. Don't be overwhelmed though, defaults are installed.

Thanks for reading. Please enjoy my work! Your thoughts are appreciated.

- Rohan

Games
S.T.A.L.K.E.R. Build 1935

S.T.A.L.K.E.R. Build 1935 S.T.A.L.K.E.R. Build 1935

Updated 9 months ago Released Oct 17, 2004 Single Player First Person Shooter

This is build 1935 of S.T.A.L.K.E.R. Shadow of Chernobyl, formally called S.T.A.L.K.E.R. Oblivion Lost. This was made by GSC Game World before they remade...

S.T.A.L.K.E.R. Shadow of Chernobyl

S.T.A.L.K.E.R. Shadow of Chernobyl S.T.A.L.K.E.R. Shadow of Chernobyl

Updated 3 weeks ago Released Mar 19, 2007 Single & Multiplayer First Person Shooter

In 1986, the world's worst nuclear disaster occurred at the Chernobyl power station. Soviet authorities established a 30km 'Exclusion Zone' around this...

S.T.A.L.K.E.R.: Call of Pripyat

S.T.A.L.K.E.R.: Call of Pripyat S.T.A.L.K.E.R.: Call of Pripyat

Updated 5 days ago Released Feb 4, 2010 Single Player First Person Shooter

Call of Pripyat takes you once again into the vicinity of the Chernobyl nuclear reactor that exploded in 1986. This so-called "Zone" is a highly contaminated...

S.T.A.L.K.E.R.: Clear Sky

S.T.A.L.K.E.R.: Clear Sky S.T.A.L.K.E.R.: Clear Sky

Updated 1 month ago Released Aug 21, 2008 Single Player First Person Shooter

A group of stalkers, for the first time, reaches the very heart of the Zone-the Chernobyl Nuclear Power Plant-and triggers a cataclysm on the brink of...

S.T.A.L.K.E.R: Oblivion Lost

S.T.A.L.K.E.R: Oblivion Lost S.T.A.L.K.E.R: Oblivion Lost

Updated 3 years ago Released Aug 27, 2002 Single Player First Person Shooter

Ones of the first concepts of S.T.A.L.K.E.R Shadow of Chernobyl.

Post comment Comments  (20 - 30 of 61)
ice_trey
ice_trey Jun 19 2011, 11:03am buried:

(buried)

worst engine ever, unnecessary ugly, nonoptimizzed , crashfriendly like nothing before, avoid if your a SERIOUS game/modder/developer

-6 votes     reply to comment
Rolfisalinas
Rolfisalinas Aug 13 2011, 4:47am replied:

"crashfriendly like nothing before", i'm asuming you havent played fallout 3 or new vegas. I gave this engine thousand of hours ussing it and it only crashed a few times when i moded my game

-2 votes     reply to comment
Derranged
Derranged Jun 29 2011, 1:50am replied:

OK, I want to see you create an engine as good as this one?

+1 vote     reply to comment
Sotoku
Sotoku Apr 22 2011, 8:42pm says:

I recently tried to replay my fully patched retail clear sky again, but when I try to run it, it says xrengine crashed.

Should I download the latest version to see if it helps?

+1 vote     reply to comment
Aggregate
Aggregate Apr 12 2011, 7:13am says:

Wait, what? There's going to be a STALKER 2?

Best. News. Ever.

+5 votes     reply to comment
Sebo_hasee
Sebo_hasee Mar 28 2011, 3:10pm says:

is it right that this engine has some codes from the source engine ?

0 votes     reply to comment
Anarcieath
Anarcieath Mar 25 2011, 9:47pm says:

Is there anything on the internet to help me with the whole modding thing? I'm kinda a noob at it but I think it's pretty fun so far and would like to learn a little more about it. Mainly adding new weapons to stalker really but I'd like to learn other things too. I'm not really looking to make a whole new mod or anything, more edit existing mods to my playing style and adding thing's I would like to see in "the game." lol sorry, I lost as I typed that but seriously, anything out there to help me out at all would be great.

+1 vote     reply to comment
Hayst
Hayst Apr 4 2011, 3:00pm replied:

youtube has lots of good videos.(nice avatar ;D)

+2 votes     reply to comment
ice_trey
ice_trey Mar 11 2011, 9:17pm buried:

(buried)

worst engine ever, its even more buggy/less optimized than the GTA4 ...

-10 votes     reply to comment
MisterChairman
MisterChairman Jul 5 2011, 7:56pm replied:

comparing x-ray to GTA4 is like tetris to crysis, It just doesn't work

+2 votes     reply to comment
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Platform
Windows
Company
GSC Game World
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Official Page
Stalker-game.com
Licence
Commercial
Release Date
Released Mar 19, 2007
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Highest Rated (4 agree) 10/10

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Mar 23 2011, 1:30pm by .sverek

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