Field of View is a component that helps to implement visualization of the area visible by the character. With its help, it is possible to implement game mechanics nicely represented by stealth-oriented real-time tactics games.

Documentation | Unity Forum

Field of View component has the following features:

● works nicely in 3D mode;

● can be individually/in bulk configured for any number of characters;

● is not static, it simulates the behavior of real character who can look around, seek for someone, etc;

● supports three modes of rotation:

1. ‘calm’ patrol, if no targets have appeared in the Field of View;

2. ‘peer’ on a target, whenever it is inside the Field of View area;