Proof Engine Lab · live in your browser · free

Roll a seed. Get a one-off.

27 renders in the last 30 days

Give O'BLOCK a number and it builds a car, watch, sculpture or piece of jewelry nobody else has: shapes carved from boxes, eggs, rods, rings and cones, painted, set on a lit plinth, turned under one lamp. Or browse the 37 things the game sells.

A one-off voxel car on a lit plinth, drawn by Proof Engine

Live engine loads in a moment (301 KB). This is a still from it.

Drag to turn · arrow keys work too · 0 resets

Your piece

Kind Seed

Or a thing from the flex shop

Brand-like names are O'BLOCK's parodies, not real products.

How to use it: pick a kind and press Roll, or type any seed number. Drag to turn it. The same kind and seed always build the same piece, so Copy link shares exactly yours.

How it works

It is the real engine. Proof Engine is the Rust renderer O'BLOCK ships with. For the web I compiled it to WebAssembly (301 KB gzipped) and swapped its desktop OpenGL window for a WebGL2 canvas. Same glyph-particle renderer, same HDR bloom and colour grade as the game.
Built from a number. The seed drives a small random generator that picks the body shape, the paint (12 hues by 12 finishes: matte, metallic, gloss), the extras and the trim. The model is a 40 x 40 x 40 voxel grid.
Materials that behave. Gold glints and chrome mirrors as it turns, ice sparkles, windows light at random and flames flicker, all computed per voxel each frame and sent through the bloom pass.
In the game these are the one-offs you can be offered for your crib, and the flex-shop pieces you buy as you climb.
Nothing leaves your device. Everything is computed in your browser tab. No account, no upload, no tracking of what you make.