UE5.5-Mega lights 101

Introduction

This is a quick Rnd to test unreal engine 5.5ʼs new feature: mega lights

Final result

Without the mega light (the scene runs around 66 FPS/15.0ms) VS Mega light on ( runs around 120 FPS / 8.3ms)

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Project setting

First, Enable mega light in the project setting

 Enable hardware raytracing

Overwrite your setting through postprocessing volume allow infinite extent Unbound) if we want to effect everything in the scene

Enable mega lights

For individual light actors we can also toggle mega lights feature on/off

Example 1

Use Rectangular light to cast screen light into the scene Use mega light with texture or media texture

Import mp4 or png image sequences to the content browser as media sources

 Create media player for the source video

Set the loop to true

create a screen with cube

Drag the texture onto the scene mesh, that would auto-create a material

 Link the RGB to emissive color in the material

Select the cube and convert it into a blueprint

Select static mesh actor

We'll just do a very simple blueprint to play the video

Go to the Detail pannel, set the target player and media source

 Play the scene

Add an area light(rectangle light) behind the screen scale source width and height to match the screen

For the source texture, select the same screen texture

 Place it in front of the screen, bring up the intensity of the light

Tada

We finished our first screen set up

Now let't get to the fun part. We are going to test hundred of the screens with mega light

Without the mega light (around 66 FPS/15.0ms) VS Mega light on ( around 120 FPS / 8.3ms)

Thanks for reading!