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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3 comments by DJScias on Dec 29th, 2010

On the New Year's eve, the S.T.A.L.K.E.R. project team has prepared a special present for mod-makers and all the game fans. Following multiple requests, the team decided to put the Software Development Kit for X-Ray 1.6 engine (S.T.A.L.K.E.R.: Call of Pripyat version) under the Christmas tree. Please, note the following key features of the SDK 0.7:

  • For the first time the SDK contains full set of instruments allowing you to create both single- and multiplayer levels.
  • The tools are partially documented (in Russian only).

! The tools are offered 'as is' and GSC Game World is unable to provide any technical support on this SDK. All the tools questions must be discussed on forum.

Have fun with the tools and Happy New Year!

Add game Games
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 1 day ago Released Mar 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 1 day ago Released Feb 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 day ago Released Aug 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. 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 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: Oblivion Lost
S.T.A.L.K.E.R: Oblivion Lost

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

Updated 4 years ago Released Aug 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  (0 - 10 of 65)
nerdenfromsweden
nerdenfromsweden Feb 26 2013, 5:52am says:

stalker is the best game series ever :) i even like it more then Half Life series.

+5 votes     reply to comment
tonzai8446
tonzai8446 Dec 7 2014, 10:24am replied:

I missed Stalker 2 :( I want stalker 2 why did it has to been cancelled
can like someone make stalker 2 as mod or game cause i have to play survarium that Ex-stalker 2 dev make now

+2 votes     reply to comment
healLV
healLV Jan 11 2015, 2:01pm replied:

S.T.A.L.K.E.R. is confirmed. Here are their new homepage Gsc-game.com .

+2 votes     reply to comment
tonzai8446
tonzai8446 Jan 11 2015, 7:58pm replied:

thx for information

+2 votes     reply to comment
Cossack-HD
Cossack-HD Jan 1 2013, 2:59pm says:

Quote: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.

This mod/addon/whatever will bring updated engine with multicore support and fixed freezes: Moddb.com
The developers got X-RAY source code...

Their_FA wrote:Q: What kind of patch will be needed?
A: Lost Alpha is based on a beta patch, called 1.0007. This was never released to the public, but we had the opportunity to get it, and fix it up. The engine is now totally upgraded, runs better than ever. This means, you don't need any SoC patches for LA, since now it became a standalone (but still free) game.

Moddb.com

+4 votes     reply to comment
Halcyon777
Halcyon777 Aug 1 2012, 1:48pm says:

Best game engine on the PC.

+5 votes     reply to comment
tonzai8446
tonzai8446 Dec 7 2014, 10:11am replied:

IT BETTER THEN METRO 2033 OR LAST LIGHT **** ALL OF THEM STALKER IS THE BEST

+1 vote     reply to comment
Estavos
Estavos May 8 2012, 8:43am says:

This is great game engine.

+2 votes     reply to comment
Metal-Payne
Metal-Payne Jan 23 2012, 11:29pm says:

You sir, are a major douche. Judging from all the bad ratings you give to top notch games and engines, I'd say it's safe to say that you are not capable of modding anything but Id tech.

+4 votes     reply to comment
Stealth-Killer
Stealth-Killer Dec 12 2011, 2:47pm says:

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

+2 votes     reply to comment
Opinionator
Opinionator Aug 24 2013, 4:56pm 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
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Platform
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GSC Game World
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Release Date
Released Mar 2007
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Mar 23 2011, 1:30pm by .sverek

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