What type of light behaves like an omnidirectional source, radiating light in all directions?

A point light behaves like an omnidirectional source because it emits light uniformly in all directions from a single location, similar to how a bare bulb radiates light. This characteristic is crucial for simulating realistic lighting in a 3D environment, where the intensity of light diminishes with distance from the source. In Unity, point lights can create effects such as illumination in enclosed spaces or soft shadows, contributing to the overall atmosphere of a scene.

In contrast, a directional light is designed to simulate sunlight and casts parallel light rays, effectively illuminating an area from a specific direction rather than radiating out from a point. A spotlight emits light in a specific cone shape, focusing illumination in a desired direction, which is useful for highlighting particular objects or areas in a scene. Area lights illuminate rectangular or spherical areas and can create more diffuse lighting than point lights but do not emit light in all directions. Each of these light types serves different functions within a lighting setup, but the omnidirectional nature of point lights makes them unique and versatile for general illumination.