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>> presenter: it's been five years [laughter] >> person in audience: it looks like hell! >> audience: wow! >> g-man: we've been rather busy in your absencemr. freeman. >> presenter: the source engine gives us capabilitiesin four main areas: believable and realistic human beings, graphics that were previouslyimpossible outside of a hollywood movie studio, an integrated materials and physics systemthat create an unprecedented level of interactivity, and artificial intelligence that welds allof these things together into an experience
gamers have never had before. a huge number of details go into creatinga character like the g-man: his eyes glint based on a radiosity calculation of the localillumination (they self-shadow and follow you as you move), he has 40 separate musclesin his face, and his emotions are based on a taxonomy of facial expressions created bydr. paul ekman, a research psychiatrist. this same system that gives him-- >> g-man: pay attention, mr. freeman; i'monly going to say this once. >> presenter: ... allows him to speak. and he can do it just as easily in any other language as english.
[g-man speaking in a non-english language] >> presenter: the character technology givesus a broad emotional palette to draw upon. so, you will really hate your enemies in half-life2, fear for yourself and your friends, and maybe discover a few new feelings along theway. >> presenter: so with characters who reactemotionally and are so expressive, we need a world that is similarly flexible and interactive. the world of half-life 2 is very dynamic. any surface can have its displacement mapaltered dynamically along with its collision model. the world is also built out of materials.
so if something looks like wood, then it sounds like wood,scrapes like wood, floats like it. and if you shoot it, it will fragmentlike wood. materials in the physics system interact witheach other. so a set of steel drums floating will behave exactly how you expect. [laughter and light applause] didn't think this would be complete withouta giant pachinko machine. you can have constraint-based-- you can have flexible models interacting withcomplex surfaces. there's no limitations on the complexity of those interactions.
so it's this level of believable and consistent interactivity that opens the door to a wide-variety of new gameplay mechanics. >> audience member: now this will run on my486? >> presenter: the graphics of the source engineare based around shaders. the same approach used to render movies like toy story and monsters, inc. the walls here are actually bump-mapped subdivision surfaces. if you look closely at the water you can see it refracts submerged objects and properly incorporates the fresnelterm to modulate the surface reflectivity. here you get a sense of the wide-variety ofvisual effects that are possible using source. there aren't many arbitrary restrictions insource on how you can use these effects.
for example, you can take one of them and applythem to a human character, effectively building them out of water. source also gives us complete control overthe outputs and inputs of the system. which you can use in some surprising ways. so, that's been our technology overview ofthe source engine. now, let's look at half-life 2, the game. here's the stuff you won't get on your 486. >> audience member: does that mean i haveto upgrade? >> presenter: it might be time.
>> audience member: my spreadsheet ran sowell! >> presenter: this next segment will introduceyou to alyx, one of your friends in half-life 2, and reintroduce dr. kleiner, oneof the scientists from black mesa. >> alyx: gordon... gordon snap out of it. you're staringat me again. [clanking noise] >> dr. kleiner: ah, warming up nicely. >> alyx: are you sure you don't want me to swap outthe polarizer. >> dr. kleiner: that's not necessary. just checking for potential modular interference in the intersplicer. conditions could hardly be more ideal.
>> alyx: i-- i hope so. i'm sorry gordon, i can't helpthinking that this isn't going to work. we should have listened to my father and doneit his way. it's just-- this is the first time i've had any hope of really strikingback at the combine. and now, we're sitting ducks unless we can get this thing running.c'mon dr. kleiner, is it gonna work or not? >> dr. kleiner: now, now, there's nothing to be nervous about. let's see. the massless field flux should self-limit and i've clamped the manifold parameters to cy-base and lg orbifold... hilbert inclusive--- [monitor falls off table] oh, do be careful.
>> alyx: we should just cut our losses and-- listen... scanners! that's it; we gotta get moving! here, gordon, take this. let's get out of here. dr. kleiner >> this will only take-- alyx >> it's too late... run! [crash] [signature source engine click audio glitch]
here we're in an old part of town outsidecity 17, one of the main locations in half-life 2. [gunshots] >> audience: "whoa!" >> audience: [laughter] >> presenter: this part of town has been boobie-trapped by a friend of yours named father gregorie. he's kind of a survivalist monk.he's left traps all over the place for you to make use of. >> audience: [laughter]
>> audience: [laughter and applause] [signature source engine clicking sound] >> presenter: here you get a look at someof your allies who are fighting along side you. >> barney: remember when we thought blackmesa was as bad as it could get? [gunshots and music] >> barney: cover me, gordon! [more gunshots] >> presenter: let me just emphasize that theseare not scripted sequences; your allies are
choosing when to advance and how to best supportyou in combat. [trademark source engine clicking sound] >> presenter: the allies in the game won't always be human.and in this segment, some of the less-intelligent aliens they've fooled into thinking that you'reone of their commanders. you have something that has the right pheremone on it, so theseantlions will do what you tell them to. [sound of aliens erupting from the ground] [sound of turrets shooting] [gutteral noises]
[antlion roar] >> audience: whoa! >> audience member: hey! >> presenter: there are quite a few wide-openoutdoor areas in half life 2. the combination of the physics system and the terrain systemmake for some really interesting gameplay. >> presenter: this last sequence you'll geta look at the citadel at the center of the alien combine. the combine is a fortress thatis slowly eating its way through the rest of city 17. [men screaming]
>> citizen: strider! >> citizen: run! [explosion] >> citizen: get the hell outa here >> audience member: f you! >> g-man: well, well... isn't this just likeold times.
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