
It is important because it can help the player shoot a mob such as ghast. This includes all types of damage, except for void, fall, and effect-related damage. Hitboxes are areas where the mob can be damaged. They are crucially important for a lot of purposes.


This line points in the direction the mob is facing. There is also a straight blue line that extends away from the line of sight. This explains how it is impossible to sneak up behind a mob without it seeing the player. Notice how the line of sight wraps all the way around the entity. This is the "line of sight", which is where its in-game eyes are, which could be independent of where they appear to be. There is also a flat red rectangle near its "eyes".

Hitboxes are regions that describe how much space an entity takes up, which can be shown by pressing the F3 + B keys. When they are shown, a white outline will be seen showing the location of the entity and the space it takes up.
