--- title: My AI agents can't use a visual editor. So I picked an... description: A developer migrated their game from three.js to Bevy (Rust) after hitting JavaScript's single-core performance ceiling with complex pathfinding and... canonical: https://daily.dev/posts/my-ai-agents-can-t-use-a-visual-editor-so-i-picked-an-engine-that-doesn-t-need-one-f7hmblzkj twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: My AI agents can't use a visual editor. So I picked an engine that doesn't need one | daily.dev og:description: A developer migrated their game from three.js to Bevy (Rust) after hitting JavaScript's single-core performance ceiling with complex pathfinding and... og:url: https://daily.dev/posts/my-ai-agents-can-t-use-a-visual-editor-so-i-picked-an-engine-that-doesn-t-need-one-f7hmblzkj og:image: https://api.daily.dev/og/posts/f7hMbLzKJ.png og:image:alt: My AI agents can't use a visual editor. So I picked an engine that doesn't need one og:image:width: 1200 og:image:height: 630 og:locale: en --- > ## Documentation Index > Fetch the complete documentation index at: https://daily.dev/llms.txt > Use this file to discover all available pages before exploring further. # My AI agents can't use a visual editor. So I picked an engine that doesn't need one **[Build With GenAI](https://daily.dev/sources/buildwithgenai)** · [@miskibin](https://daily.dev/miskibin) · 2 min read · 2 upvotes · 1 comments ## Summary A developer migrated their game from three.js to Bevy (Rust) after hitting JavaScript's single-core performance ceiling with complex pathfinding and simulation. The key driver was an unusual requirement: the engine had to be entirely code-first, because AI agents are used to build the game and cannot interact with visual editors or scene inspectors. Bevy's code-defined assets, multi-threaded ECS, and lack of a visual editor made it ideal for AI-assisted development. The result is a fully version-controlled, diffable codebase including all art and geometry, which agents can regenerate from specs. ## Content I built my game in **three.js**. It worked — until it didn't. I hit a wall that no amount of optimization was getting me past: **JavaScript runs on a single CPU core.** Once the sieges got big — hundreds of pathfinding enemies, waves, economy sim — one core just wasn't enough. I needed real parallelism. So I went looking for an engine, with one unusual hard requirement: **it had to be code-first.** Here's why. I don't build this game by hand — I build it with **AI agents**. And an agent can't drag a mesh around in a scene editor, tweak a material in an inspector, or nudge a light in a viewport. Every visual tool that helps a human _blocks_ an agent. What an agent _can_ do, brilliantly, is write code. **Bevy** turned out to be perfect for exactly this: - **No visual editor, no scene files** — every mesh, material, light and shader is _defined in Rust_. My agents author geometry as code: build primitives, tint vertex colors, merge, flat-shade. The whole world is a function. - **Multi-threaded by default** — Bevy's ECS parallelizes systems across cores. The single-core wall is just gone. - **Performance is genuinely great** — thousands of instanced props, real-time lighting, post-processing, and it holds framerate. The kicker: because everything is code, the _entire game is reviewable, diffable, and version-controlled_ — including the art. My agents can regenerate a whole biome from a spec and I can read the diff. Same game. New engine. Here's three.js (left) vs Bevy (right) Old: [tileworld](https://miskibin.github.io/tileworld/) new: [miskibin/warbell: Action-RPG: a Bevy 0.19 / Rust game — town-building, night sieges, upgrades, bloodline succession](https://github.com/miskibin/warbell) ## Community discussion Top comments from developers on daily.dev. **@khauma** · 1 upvotes > This is dope! I'm actually going through a bevy tutorial right now. ## Similar posts on daily.dev - [Bevy 0.19](https://daily.dev/posts/bevy-0-19-sk3tvicux) · Lobsters · 19 upvotes · 2 comments - [Tainted Coders](https://daily.dev/posts/tainted-coders-uszkmxkzh) · Hacker News · 0 upvotes · 0 comments - [Bevy's Sixth Birthday](https://daily.dev/posts/bevy-s-sixth-birthday-bb5mw85zl) · Lobsters · 1 upvotes · 0 comments --- Tags: [#game-development](https://daily.dev/tags/game-development), [#ai-agents](https://daily.dev/tags/ai-agents), [#rust](https://daily.dev/tags/rust), [#threejs](https://daily.dev/tags/threejs), [#bevy](https://daily.dev/tags/bevy) [View this post on daily.dev](https://daily.dev/posts/my-ai-agents-can-t-use-a-visual-editor-so-i-picked-an-engine-that-doesn-t-need-one-f7hmblzkj) ```json {"@context":"https://schema.org","@graph":[{"@type":"Organization","@id":"https://daily.dev/#organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180},"sameAs":["https://twitter.com/dailydotdev","https://github.com/dailydotdev","https://www.linkedin.com/company/daily-dev-ltd"]},{"@type":"WebSite","@id":"https://daily.dev/#website","url":"https://daily.dev","name":"daily.dev","publisher":{"@id":"https://daily.dev/#organization"},"potentialAction":{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https://daily.dev/search?q={search_term_string}"},"query-input":"required name=search_term_string"}}]} {"@context":"https://schema.org","@type":"DiscussionForumPosting","mainEntityOfPage":"https://daily.dev/posts/my-ai-agents-can-t-use-a-visual-editor-so-i-picked-an-engine-that-doesn-t-need-one-f7hmblzkj","headline":"My AI agents can't use a visual editor. 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