Decals, Lens Flares & Halos

Decals, Lens Flares & Halos

Unity rendering support includes built-in specialized effects for detailing environments, light points, and atmosphere.

Decals (URP & HDRP)

A Decal projects a material onto other meshes (like posters on walls, bullet holes on surfaces, or blood splatters on floors):

• Decal Projector component: Projects a decal material within a bounding box.
• The projection automatically deforms to match the shape of the surface meshes it intersects.
• To use decals in URP, you must add the Decal renderer feature to your URP Forward Renderer asset settings.

Lens Flares

Lens Flares simulate the optical scattering of light inside a physical camera lens (causing halos and rings when looking at bright lights):

• SRP Lens Flare component: Attach this to a Light or GameObject.
• Set a Lens Flare Data asset defining the rings, flares, and chromatic aberration shapes.
• The flare automatically fades when blocked by other colliders.

Light Halos

A Halo creates a soft glowing ring around light sources to simulate misty air or dusty light scattering:

• Enable the Draw Halo checkbox on a Light component, or add a standalone Halo component to a GameObject.

TL;DR

• Decal Projector overlays materials onto existing mesh surfaces dynamically.
• Decals require the Decal Renderer Feature enabled in the URP asset.
• SRP Lens Flares simulate camera lens light reflection and scatter.
• Halos simulate atmospheric dust or moisture scattering light.