Dev Log #8: I Built a 3D-to-2D Spritesheet Tool (Open Source)

One of the consistent pain points in my workflow has been bridging the gap between 3D assets and 2D games. I work in a retro/pixel aesthetic, but I don’t always want to hand-animate everything from scratch — sometimes you want a model, a camera angle, and a clean sprite sheet output. So I built that.

What It Does

It’s a browser-based tool for converting .glb files into 2D sprite sheet animations.

Drop a model in, position your camera, pick an animation clip, configure your output parameters, and download a PNG sprite sheet — frames sampled evenly across the animation, laid out in a grid, ready to drop straight into any 2D game engine.

No installs. No dependencies on your machine. It runs entirely in the browser.

How to Use It

Drop a .glb file onto the viewer area (or click to browse)
Orbit the camera to the angle you want — drag to orbit, right-drag to pan, scroll to zoom
Select an animation from the dropdown (populated automatically from the model)
Set the number of frames, frame size in pixels, and column count for the grid layout
Choose transparent or black background
Click Generate Spritesheet and download the PNG

That’s it. The output is a standard sprite sheet grid you can slice in Godot, Unity, GameMaker, or anywhere else.

Why I Built It

I needed it for my own games at mangasmango.com. I was tired of exporting frames manually or relying on tools that required a specific pipeline I didn’t want to adopt.

The goal was something frictionless: give it a model, get a sprite sheet. Nothing more, nothing less.

It’s Open Source

The source is on GitHub if you want to look at it, fork it, or use it in your own pipeline:

github.com/ValisStamatis/3d-to-2d-spritesheet

Pull requests welcome. If it’s useful for you, let me know what you’re making.

See you in the next one,
— Stamatios