Kotaku pointed out the comments (via a NeoGAF thread), where Lowrie--who also provided voices for "DOTA 2" and whose wife Ellen McClain is the voice of GlaDOS--made the claim that the challenge of capturing realistic human eye movement was the reason Valve wasn't actively developing a follow-up to the beloved sci-fi FPS.
Here's the meatiest comment from the actor:
Here is the biggest challenge with bringing out HL3: the big thing now with FPSs is motion capture, or mo-cap. One of the great things about HL2 is that all of the characters that you meet actually look at you when they talk to you no matter where you go or stand. With mo-cap you can’t do that, at least not yet. Once you film the actor doing something and capture that motion, that’s what the character is going to do. This works great in movies, but when you make something interactive it gets way less interactive with mo-cap. So that’s one of the things they’re working on.
Later, Lowrie adds that much of this conjecture here is based on "a conversation [he] had," we'll presume with a Valve employee. But who's to say what the notoriously secretive developer--with its discrete, multiple teams--is up to? To counterbalance that piece of optimism, I guess, a game like "Half-Life 3" would require a fairly large team, and as Lowrie correctly points out, Valve has been publicly throwing most of their support behind further iterations of Steam, while the studio went through a round of layoffs back in February (although Valve boss Gabe Newell says none of those employees dismissed were part of active projects).
The critically-acclaimed "Half-Life 2" was released back in 2004, with two follow-up episodes that were supposed to be accompanied by a third and final episode.
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