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.


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.


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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Time has built up between the last update I shared about this project, many things have changed and many things will keep up changing.

I have been making changes on the software, and it is now fully open for new possibilities. Although this tool was initially designed for S.T.A.L.K.E.R., I made recent changes in its core libraries to make it both attractive and flexible. What does this mean? Well, let me show you:

- New GUI

S.T.A.L.K.E.R. Optimizer brand new GUI

The Optimizer will feature a brand new GUI, far more attractive than the previous interface. Each item will have its info box to let the user know what does each button do, things will be kept in the simplest way possible both to provide a harass-free experience and to keep the resources consumption to the minimum, while providing rich features and good-looking forms.

- Added flexibility

Optimizer console

While the main purpose of this tool was reducing the chances to get memory leaks and related CTDs with X-Ray Engine (S.T.A.L.K.E.R. games), I had another idea... a console to make this tool work for any process. With this full-flexible console, the tool will work for any process with three defined actions: DIRECT OPTIMIZATION, MONITORING, and TERMINATING. These integrated functions will allow the tool to optimize a process once, monitor a process and optimize it each interval of time, or force the termination of a process. BUT, as you may have noticed, this flexibility brings downsides. Many malicious users might use this tool to cause memory related malware like worms, or CPU hogging malware, and that is why I intend to keep the tool hard-coded.

What I mean is, while the tool will be able to assist ANY game in memory duties, I will NOT let the user access directly to the console to avoid issues. So if you want your favorite game in the next version's (not 1.0, but 2.0) list then just leave a comment with the name of the game or PM me about it and I will add it.

That said, I will include that from the next version (not 1.0, but 2.0) and on, the tool will be called "Memo Creeper" and will be fully flexible to support any process without issues.

List of new features -> S.T.A.L.K.E.R. Optimizer 1.0:

- Brand new interface.

- Internal code fully optimized

- Console based tasks for optimizing, monitoring or terminating processes

- Full integration with S.T.A.L.K.E.R. Engine (X-Ray) (via scripting)

Coming features -> Memo Creeper 2.0:

- Multi-purpose optimizer, with support for variety of games/engines

- Memory leaks recognition for internally listed games

- Automatic detection and termination of hanged games

- MAYBE a restricted version of the console to allow the user use it on other processes (with restricted I mean locked for certain processes and cut off from certain aspects)

- Detection of virtual memory addressed by process (and automatic optimization, if possible)

- Memory lock for unstable engines (good ol' X-Ray cited again, but also others like Source...if you played Vampires - The Masquerade Bloodlines you'll understand what I'm talking 'bout)

Don't forget to leave your opinion in the comments, and feel free to speak any suggestions out loud, Stalkers.

Regards, YeiZoneX @ CreepDev -> a group led by giant rabbits and brown unicorns with no horns.

STALKER Clear Sky music... and more.
S.T.A.L.K.E.R.: Clear Sky

STALKER Clear Sky music... and more.

4 years ago S.T.A.L.K.E.R.: Clear Sky 3 comments

I have completed the music overhaul for Clear Sky, as well as a couple of other things I have been working on.

Absolute Nature 2 for S.T.A.L.K.E.R. Clear Sky
S.T.A.L.K.E.R.: Clear Sky

Absolute Nature 2 for S.T.A.L.K.E.R. Clear Sky

4 years ago S.T.A.L.K.E.R.: Clear Sky 11 comments

Tired roaming all the same looking Zone? Choose from 5 different styles. Each area can have unique ground and foliage textures.

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

Call of Pripyat music expansion released

4 years ago S.T.A.L.K.E.R.: Call of Pripyat 0 comments

That happened quickly; 53 minutes of new music to aid your immersion in the zone.

One project ends, another begins
S.T.A.L.K.E.R. Shadow of Chernobyl

One project ends, another begins

4 years ago S.T.A.L.K.E.R. Shadow of Chernobyl 11 comments

Because what's a horrendous wasteland without music? Shadow of Chernobyl music expansion.

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

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

1 month ago Released 2010 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. Shadow of Chernobyl

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

1 month ago Released 2007 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.: Clear Sky

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

2 months ago Released 2008 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. Build 1935

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

11 months ago Released 2004 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: Oblivion Lost

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

4 years ago Released 2002 First Person Shooter

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

Post comment Comments  (10 - 20 of 65)
Stealth-Killer Dec 12 2011 says:

Yeah brolee!?... get a better machine, ***!

+2 votes     reply to comment
Opinionator Aug 24 2013 replied:

How old is SOC/CS/COP how many gamers have had and still have major issues with these games no matter the high or low their hardware specs. X-ray its a bag of broken unoptimized **** and always has been and always will be, get real and eat some H pie.

-4 votes     reply to comment
Opinionator Nov 4 2011 buried:


Xray? Crapyray more like. Stalkers are really old games and they still run awful on modern PCs even after so many patches. In game frame rate stuttering and freezing while its loads mid game just kills off the emersion and your aim, awh crap dead again :(

-17 votes     reply to comment
SurvivorSTK Apr 8 2013 replied:

your word just mean your PC is ****

-2 votes     reply to comment
Opinionator Aug 24 2013 replied:

OMG GSC and Steam forums take a look, facepalm and fail to you too dude.

-4 votes     reply to comment
hukondejo Sep 25 2012 replied:

I bought the game "Shadow of Chernobyl" and "Call of pripyat" bundle on steam, and gues what.
No more lag, stuttering, freezing.

+5 votes     reply to comment
Blakluma Jan 28 2012 replied:

x-ray is a great engine and probably the most capable engine I have ever seen.
Sadly though it is hard on the proccesor and RAM.

+5 votes     reply to comment
Opinionator Aug 24 2013 replied:

Just say unoptimized will ya sheesh.

+1 vote     reply to comment
Cossack-HD Dec 10 2011 replied:

If you're not Stalker modder then you can't understand all awesomeness of X-RAY...

+9 votes     reply to comment
Opinionator Aug 22 2013 replied:

Yeah the Xray engine its so awesome all the games need community patches and bug fixes so its a little less broke and a little less ******. Don't get me wrong almost everything is great about Stalker series except the Xray engine, they should of called the CTD engine lol. Bury me fanboys in your own denial.

I don't need to be a mechanic to know if I am driving a **** car or not, facepalm to your come back.

+1 vote     reply to comment
Protos.Angelus Aug 9 2011 says:

First of all S.T.A.L.K.E.R. 2 is coming out on a NEW ENGINE--- much better etc. so let's all focus our thoughts on that game not these past games. OK? Pray that the upcoming stalker will be a brilliant, bugless game.

-2 votes     reply to comment
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GSC Game World
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Released 2007
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Highest Rated (4 agree) 10/10


Mar 23 2011 by .sverek

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