Bloom, Dirt, Light Shaft, and Lens Flare

In this section, multiple effects are explained because the process steps to calculate them are similar, and they were implemented together for performance reasons.

Bloom

This effect produces fringes (or feathers) of light extending from the borders of bright areas in an image, contributing to the illusion of an extremely bright light overwhelming the camera or eye capturing the scene.

Parameter	Description
Threshold	Pixels with a luminance higher than the threshold value will apply the effect.
Color Intensity	Defines the bloom color intensity in the final blended image.
Intensity	Defines how the rendered image and the bloom output will be blended.

Dirt

This effect tries to simulate when the camera lens is dirty and some lens stains are visible.

Parameter	Description
Texture	Dirt texture used.
Intensity	Dirt intensity or how the rendered image and dirt output will be blended.

Light Shaft

Light Shaft, also known as God Rays, allows the viewer to see beams of light shining across the environment.

Parameter	Description
Min. Threshold	Minimum luminance of the pixel to be affected by the effect.
Max. Threshold	Maximum luminance of the pixel to be affected by the effect.
Scale	Size of the effect.
Intensity	Defines how the rendered image and the bloom output will be blended.

Lens Flare

A Lens Flare happens when light is scattered or flared in a lens system, often in response to bright light, producing a sometimes undesirable artifact in the image. This occurs through light scattered by the imaging mechanism itself, for example through internal reflection and forward scatter from material imperfections in the lens.

Parameter	Description
Ghost Count	The number of ghost images.
Ghost Spacing	The distance between ghost elements.
Ghost Threshold	Pixels with a luminance value above the threshold will be used to generate the ghost elements.
Halo Radius	External halo radius.
Halo Thickness	External halo thickness.
Halo Threshold	Pixels with a luminance value above the threshold will be used to generate the halo.
Halo Chromatic Aberration	Amount of chromatic aberration.
Intensity	Defines how the rendered image and the bloom output will be blended.