Half-Life: Alyx Was Impossible for Tall Players, and Here's How Valve Fixed It

Half-Life: Alyx received generally positive reviews for its gameplay and player movement in particular

in virtual space. The polished mechanics were partly the result of a bug that the Valve team encountered early in development.

What is known

Half-Life Developers:Alyx recorded a short video in which they talked about the development of player movement. The first problem that the Valve team encountered was the designation of the teleport marker. In the end, the developers settled on foot prints, as they showed the volume of the main character’s body and helped to better understand why some places remain inaccessible.

The second problem was the growth of the players.In the early stages of development, testers discovered a difficult-to-repeat bug that prevented players from getting to places where other users could easily get to. It turned out that only tall people submitted bug reports. As Greg Coomer explained, people are used to seeing the world from their own growth perspective, and Valve wanted to keep that in Half-Life: Alyx. As a result, a person’s height influenced the size of the virtual body and perspective in the game world.


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We solved the problem by removing the condition that the player's heightmust fit in space along the entire teleport path. So, initially, in order to get into a narrow passage, the player had to sit down and only then press the teleport button. The updated system ignored the parameter, essentially reducing the size of Alix's model when moving in narrow spaces.

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