Meep Engine

Build richly lit 3D worlds for the web in JavaScript.

Meep is a game engine with a GPU-driven WebGPU renderer, physics, spatial audio, rollback networking and an in-app editor.

Examples · Documentation · Licence & pricing

Getting started

npm install @woosh/meep-engine

Follow the installation guide for setup and WebGPU requirements. The package includes samples/engine/first-scene/main.js, a scene with lighting and keyboard input.

Rendering

Lighting, shadows, decals, transparency and volumetric fog work together in an integrated pipeline with shared scene data.

• Thousands of dynamic lights. The engine manages shadow coverage, resolution and updates, while lighting work is concentrated on the pixels each light reaches.
• Large scenes with low CPU overhead. GPU visibility culling and batched geometry keep draw calls low as scenes grow. Deferred shading concentrates material evaluation on visible surfaces.
• Adaptive resolution. The engine adjusts rendering resolution and upscales to the display size to help maintain frame rate as load changes. This is enabled by default through Engine.
• Custom rendering passes. Add effects through render extensions. The frame graph orders the work by its dependencies and removes unused passes automatically.

Shadows, ambient occlusion, image-based indirect lighting, auto-exposure, anti-aliasing and order-independent transparency are enabled by default, alongside tonemapping, bloom and sharpening. Tonemapping adapts to SDR and HDR displays.

Optional features include baked volumetric global illumination, screen-space reflections, motion blur, depth of field, virtual texturing, a neural upscaler and a reference path tracer.

See the renderer guide for scene setup, rendering controls and custom passes.

Engine features

• Architecture. An entity-component system with parent/child hierarchies and allocation-conscious hot paths.
• Physics. Deterministic JavaScript rigid bodies, convex and mesh collision, continuous collision detection, character and vehicle controllers, and inverse kinematics, plus fluid simulation.
• Audio. Events, mixer buses, real-time parameters, snapshots and ducking, with optional scene-driven occlusion, transmission and reverb.
• Networking. Server-authoritative rollback with prediction, reconciliation and binary snapshots over WebRTC, WebTransport, WebSocket or Node UDP.
• Navigation & AI. Grid and navigation mesh pathfinding, behaviour trees, blackboards and Monte-Carlo tree search.
• Procedural generation. Rule-driven grids, entity placement and reusable themes, composed as generation tasks.
• Assets. glTF with meshopt compression, asset streaming, PNG/JPEG/AVIF decoding and versioned binary serialization.
• Tools. An editor for live scenes, per-pass GPU profiling, and a software WebGPU implementation for shader and pipeline testing.
• Input & UI. Touch, mouse, keyboard and gamepad input, an optional DOM UI layer, localisation, achievements and persistent storage.

In development since 2013 and used in a commercial Steam release. Automated tests cover physics determinism, networking and shader execution.

Production builds

Use @rollup/plugin-strip to remove development assertions from production bundles. For Vite:

// vite.config.js
import { defineConfig } from 'vite';
import strip from '@rollup/plugin-strip';

export default defineConfig({
    plugins: [{ ...strip(), apply: 'build' }]
});

The plugin's defaults strip both assert.* and console.* calls.

Licence & pricing

Free for small projects. Projects with both cumulative funding and cumulative revenue under US$50,000 each can ship commercially at no cost. Evaluation and internal prototypes are free regardless of funding. Paid licences are a one-time fee per project and include 24 months of major-version coverage.

See the licence overview and pricing page for details. The package terms are in LICENSE.

Copyright © 2026 Company Named Limited. All rights reserved.