A component to make Unity's Light component flicker by a sequence of alphabets. This way of implementing flickering lights is inspired by Valve, which is used in their games like Quake and Half-Life series.

⚠️ PHOTOSENSITIVE WARNING: This document may contain animated GIFs with flashing images and are hidden by default. Click on the foldouts to reveal the original image.

(Click to show) Select from 12 presets, or type in custom patterns, and preview the changes in realtime.

1. Download the full repository.
2. You can try out the test scene under the Test folder to see how it works.

1. Add LightFlicker to an existing Light component.
2. Click on the Preview Pattern to see the flicker pattern in action in Edit Mode. A preview Animation Curve and a timeline cursor will help visualize the change of the light intensity in a graph.
3. Select the flicker pattern from a group for presets or type in a custom pattern.
4. The pattern defines how the light intensity will change in sequence using alphabets a to z, from lowest (a being 0% brightness) to highest (z being 200% brightness).
5. Define the Normal Brightness, the light intensity at 100% brightness, or when the flicker pattern reaches the m letter.

• Note that this will override the Intensity field on the original Light component.

6. Define the Pattern Duration and toggle the Lerp option (linear interpolation, i.e. whether the light intensity will change smoothly or not).
7. Some public properties are exposed so settings can be changed by other scripts, see the section below.

Speed Settings

Here are all 15 presets available to quickly achieve flickering lights. You may add your own presets under the file Utility/LightFlickerUtility.cs.

None

Preview	Click to show
Preset Enum	LightFlickerUtility.Preset.None
Actual Sequence	a

Normal

Preview	Click to show
Preset Enum	LightFlickerUtility.Preset.Normal
Actual Sequence	m

Double Brightness

Preview	Click to show
Preset Enum	LightFlickerUtility.Preset.DoubleBrightness
Actual Sequence	z

Fluorescent Flicker

Preview	Click to show
Preset Enum	LightFlickerUtility.Preset.FluorescentFlicker
Actual Sequence	mmamammmmammamamaaamammma

Slow Strobe

Preview	Click to show
Preset Enum	LightFlickerUtility.Preset.SlowStrobe
Actual Sequence	aaaaaaaazzzzzzzz

Gentle Pulse

Preview	Click to show
Preset Enum	LightFlickerUtility.Preset.GentlePulse
Actual Sequence	jklmnopqrstuvwxyzyxwvutsrqponmlkj

Slow Strong Pulse

Preview	Click to show
Preset Enum	LightFlickerUtility.Preset.SlowStrongPulse
Actual Sequence	abcdefghijklmnopqrstuvwxyzyxwvutsrqponmlkjihgfedcba

Slow Pulse Not Fade To Black

Preview	Click to show
Preset Enum	LightFlickerUtility.Preset.SlowPulseNotFadeToBlack
Actual Sequence	abcdefghijklmnopqrrqponmlkjihgfedcba

Fast Strobe

Preview	Click to show
Preset Enum	LightFlickerUtility.Preset.FastStrobe
Actual Sequence	mamamamamama

Underwater Light Mutation

Preview	Click to show
Preset Enum	LightFlickerUtility.Preset.UnderwaterLightMutation
Actual Sequence	mmnnmmnnnmmnn

Candle (First Variety)

Preview	Click to show
Preset Enum	LightFlickerUtility.Preset.Candle1
Actual Sequence	mmmmmaaaaammmmmaaaaaabcdefgabcdefg

Candle (Second Variety)

Preview	Click to show
Preset Enum	LightFlickerUtility.Preset.Candle2
Actual Sequence	mmmaaaabcdefgmmmmaaaammmaamm

Candle (Third Variety)

Preview	Click to show
Preset Enum	LightFlickerUtility.Preset.Candle3
Actual Sequence	mmmaaammmaaammmabcdefaaaammmmabcdefmmmaaaa

Flicker (First Variety)

Preview	Click to show
Preset Enum	LightFlickerUtility.Preset.Flicker1
Actual Sequence	mmnmmommommnonmmonqnmmo

Flicker (Second Variety)

Preview	Click to show
Preset Enum	LightFlickerUtility.Preset.Flicker2
Actual Sequence	nmonqnmomnmomomnon

• https://github.com/ValveSoftware/halflife/blob/c7240b965743a53a29491dd49320c88eecf6257b/dlls/world.cpp#L557-L605
• https://assetstore.unity.com/packages/templates/tutorials/shader-calibration-scene-25422