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Runtimes · Unreal Engine

Animated UI in Unreal Engine.

The EggRuntime plugin adds EggAnimation, a Blueprint type that loads an .egg, plays animations and state machines, takes inputs and pointer events, and draws into a texture for a widget or a material.

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In short

In Unreal Engine, add the EggRuntime plugin to your project's Plugins folder. In Blueprint, construct an EggAnimation, Load File, Start State Machine, then each tick Advance and Render into a texture you put on an Image widget or a material.

Platform
Unreal Engine (Mac, Windows, iOS, Android)
Binding
EggRuntime plugin, Blueprint and C++
Draws with
UTexture2D for widgets and materials
Same file everywhere
One .egg plays the same on every runtime
License
MIT or Apache-2.0

Set it up

  1. Run setup.sh to build the native runtime into the plugin's ThirdParty folder.
  2. Copy EggRuntime to <YourProject>/Plugins/EggRuntime, regenerate project files and build.
  3. Blueprint: Construct Object from Class (EggAnimation) › Load File › Start State Machine.
  4. Every tick: Advance(Delta), Render(W, H), and set the texture on an Image brush or a material.

Last checked against the product on 2026-10-15.

Examples you can play

All templates
Game HUD: an Ova Motion templateInterface
Game HUDTake hits, drink potions, cast spells and finish quests: bars drop with a trail, damage floats up, a level-up bursts with light, low health pulses red.
Choose your hero: an Ova Motion templateCharacters
Choose your heroPick a hero: it hops onto the stage in its own light, its name and story change and the stat bars slide to its numbers.
Car dashboard: an Ova Motion templateInterface
Car dashboardHold Gas or Up to drive, Brake or Down to stop, Left and Right to signal: a script runs the car and its gearbox, the gauges and road follow it.
Radar: an Ova Motion templateInterface
RadarA sweeping radar: contacts glow as the beam passes and drift; tap one to lock it and read its bearing, range and speed.

Questions

Can I use it in UMG widgets?

Yes. Put the rendered texture on an Image brush in a widget.

What can my code change at run time?

State machine inputs (booleans, numbers, triggers), view model properties bound in the file (text, numbers, colours, enums, pictures, lists), and pictures, sounds and fonts handed over by your app. Your code also reads the current state and the events the file reports.

Is the runtime free to use in commercial apps?

Yes. The runtimes are licensed MIT or Apache-2.0, and what you make in the editor is yours.

Read next

HUDs, menus and characters that feel alive.Rig characters with bones, build menus and HUDs with state machines, script the rest in Luau, and play the result in Unity, Unreal or a web game.Animated game UI in Unity.A Unity package with EggPlayer, a component that plays an .egg into a texture on a RawImage or the object's Renderer and forwards UI pointer events to its state machine.RuntimesPlay .egg files on the web, iOS, Android, Flutter, Unity, Unreal or through the C API.

Start with an egg.
Ship an interface.

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