In a first-person shooter, which setting needs to be increased to prevent enemy guards' arms and heads from coming through closed doors?

Increasing the agent radius is crucial for preventing enemy guards' arms and heads from passing through closed doors. In navigation, the agent radius defines the space an AI agent occupies in the virtual environment. When the radius is too small, it allows the agent's extremities to intersect with obstacles, such as doors, leading to unnatural animations where parts of the character appear to go through solid objects.

By correctly setting the agent radius, you ensure that the character's entire physical presence is considered during navigation and collision detection, resulting in more realistic movement and interactions with the environment. This adjustment prevents any part of the character from unintentionally penetrating through walls or doors, thus preserving immersion and maintaining the integrity of the gameplay experience.

In contrast, agent speed refers to how quickly the AI moves, stopping distance pertains to how close an agent can get to its destination before stopping, and obstacle avoidance deals with the agent's ability to navigate around obstacles. While all these settings are essential for AI behavior, they do not directly address the issue of model parts intersecting with closed doors like adjusting the agent radius does.