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The carve feature of the NavMesh Obstacle is essential for mobile geometry because it allows moving objects within a scene to dynamically alter the navigation mesh as they move. This is particularly important for obstacles that are not static and may change positions or shapes during gameplay, such as vehicles or props that can be pushed around.

When the carve feature is enabled, the NavMesh will update to reflect the area that is blocked by the obstacle, ensuring that AI agents that rely on the NavMesh for navigation are aware of the changed pathing around mobile objects. This prevents agents from attempting to navigate through areas that are temporarily blocked, enhancing the realism and functionality of AI movement in dynamic environments.

The other options, while related to navigation and movement, do not specifically address the need for adapting the navigation mesh in relation to moving obstacles in the same direct manner that the carve feature does. Height adjustment focuses on altering the vertical dimensions of obstacles, dynamic scaling pertains to changing the size of objects generally, and speed override adjusts the behavior of agents without directly impacting how the navigation mesh interacts with mobile geometry.