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Flare

This node simulates lens flares that are created by reflections between lenses inside a film or video camera when the camera is pointed towards a bright light source, such as the sun. Lens flares are typically added to compositions to create a sense of realism, implying that the image is an un-edited shot of a real life scene.

Lens flares are generally round, oval, or roundish with 5 or 6 flattened sides. They tend to show chroma shifting, generating rainbow-like outlines. Nuke flares are implemented as a donut-like shape. They have three radii:

The outer radius is the outside of the donut.

The middle radius is the thickest part.

The inner radius is where the donut hole would be.

You can define two colors for the flare: the color of the donut itself and the fill color for the donut hole. If these two colors are the same, flares are rendered as disks.