How does Atlas find Three.js scene setup without knowing specific filenames?

Atlas uses hybrid semantic and keyword retrieval, indexing code by AST declarations with tree-sitter. This allows it to understand the meaning of your Three.js code,like `new THREE.Scene()` or `renderer.render(scene, camera)`,regardless of the file path, providing highly relevant snippets from files such as `src/main.js` or `src/app.ts` that define core 3D logic.

Can Atlas help me understand GLSL shaders in a new Three.js project?

Yes, Atlas can read and analyze GLSL shader strings inline in your JavaScript/TypeScript files or in separate `.glsl` files. You can use `codebase_search` to ask "how are custom GLSL shaders defined and used in materials?" or `task explore` to "find all GLSL files and summarize their inputs and outputs," providing a clear overview of the project's custom rendering effects.

Is it safe to let Atlas explore my Three.js codebase?

Absolutely. The `explore` subagent operates with a `deny-by-default` permission set, allowing only read-only tools like `grep`, `glob`, and `read`. Every Atlas tool call is permission-gated, and any proposed file edits are presented as a unified diff for your explicit approval before writing, ensuring your Three.js project remains untouched without your consent.

How does Atlas integrate with `npm` and `vitest` in Three.js projects?

Atlas recognizes your `package.json` and can execute `npm` commands via its `bash` tool, such as `npm install` or `npm run dev`. For testing, Atlas can run `vitest` behind a permission prompt, allowing you to verify changes. It also integrates with `prettier` to format any proposed diffs, maintaining your project's code style and ensuring consistency with your existing Three.js development practices.

Can Atlas prevent GPU memory leaks in Three.js applications?

Yes, Atlas can identify areas where Three.js geometries, materials, and textures are created but not properly disposed of. You can instruct Atlas to "add `dispose()` calls for all unused Three.js objects when a scene unmounts," helping to prevent common GPU memory leaks that can degrade application performance and stability over time, especially in complex 3D scenes.

What Three.js specific files or patterns does Atlas prioritize during onboarding?

Atlas prioritizes files and patterns related to scene graph construction (`THREE.Scene`, `THREE.Camera`, `THREE.WebGLRenderer`), object creation (`THREE.Mesh`, `THREE.BufferGeometry`, `THREE.Material`), animation loops (`requestAnimationFrame`), and resource loading (textures, models). It also understands common Three.js project structures like `src/scenes/`, `src/components/`, and `src/shaders/` to quickly orient you.

How does Atlas handle `requestAnimationFrame` loops in Three.js for performance?

Atlas can analyze your `requestAnimationFrame` loops to detect per-frame object allocations, such as `new THREE.Vector3()` or `new THREE.Matrix4()`. It can then suggest refactoring these to use pre-allocated, reusable instances, significantly reducing garbage collection overhead and improving the smoothness and performance of your Three.js animations and interactions, which is crucial for a responsive 3D experience.

Onboard to an Unfamiliar Three.js Codebase with Atlas in 2026

Atlas helps Three.js developers in 2026 quickly build a working mental model of unfamiliar codebases by leveraging semantic search, intelligent file reading, and permission-gated exploration, integrating direct with `npm` for dependencies, `vitest` for testing, and `prettier` for formatting. This approach allows you to grasp complex Three.js scene graphs and render loops efficiently, focusing on meaning rather than exhaustive file-by-file review.

How Atlas semantically understands a Three.js project's core logic?

In 2026, Atlas begins understanding an unfamiliar Three.js codebase by performing a semantic search for core concepts like scene graph setup, render loops, and material definitions. This initial step bypasses the need to manually open dozens of files, providing a focused starting point within seconds.

When you encounter a new Three.js project, the first challenge is locating the critical files that define its 3D experience. Instead of guessing, Atlas uses `codebase_search` to query its semantic index. For instance, asking "how are Three.js scenes initialized and rendered?" will return ranked snippets from files like `src/main.js`, `src/scenes/MyScene.js`, or `src/app.ts` that contain relevant declarations and logic. Atlas indexes code by AST declarations using tree-sitter, ensuring it understands the structure of your Three.js components, materials, and geometries, even if they are defined in custom classes or utility functions. This means Atlas can identify where `THREE.Scene`, `THREE.WebGLRenderer`, or custom `ShaderMaterial` instances are created and configured, providing a precise entry point into the codebase's unique architecture and helping you build a mental model of the project's core Three.js functionality.

How to map the Three.js project structure and key files?

After identifying core logic, mapping the overall Three.js project structure is crucial, and Atlas facilitates this in 2026 by using `glob` to reveal directory layouts. This provides a high-level overview of where assets, components, and shaders are organized, often within 1-2 commands.

Once you have a semantic understanding of key Three.js concepts, you need to see how the project is physically organized. Atlas's `glob` tool allows you to quickly survey the top-level directories and common Three.js specific subdirectories without opening individual files. Running `atlas glob "src/*"` might reveal `src/scenes/`, `src/components/`, `src/shaders/`, `src/utils/`, and `src/assets/`. This immediately tells you about the project's modularity and naming conventions for its 3D elements. Following this, the `read` tool lets you pull the contents of the two or three files `codebase_search` ranked highest, such as `src/main.js` or `src/scenes/DefaultScene.js`. From there, you can use the `lsp` tool's `goToDefinition` operation to follow imports and trace the flow of Three.js objects, materials, and textures, building a comprehensive mental model of the scene graph's construction and dependencies.

How Atlas ensures safe, read-only exploration of Three.js code?

Exploring a large Three.js codebase without accidentally modifying it is paramount, and Atlas addresses this in 2026 with its `explore` subagent. This subagent operates with a deny-by-default permission set, ensuring that it can only read and search, preventing any unintended changes to your project's 3D assets or logic.

When you need to perform wide sweeps or investigate specific patterns across many files in a Three.js project,like finding all instances of `THREE.MeshBasicMaterial` or identifying all custom GLSL shader files,you can delegate this work to the `explore` subagent using the `task` tool. The `explore` subagent is designed for safety; it is permissioned with a `deny-by-default` rule set that only allows read-only operations such as `grep`, `glob`, `read`, `bash` (for non-modifying commands), `webfetch`, and `websearch`. This means you can confidently ask Atlas to "find all files that define custom Three.js geometries" or "summarize how textures are loaded in `src/utils/`" without any risk of Atlas altering your `package.json`, `vite.config.js`, or any Three.js scene files. Every Atlas tool call is permission-gated against allow, ask, and deny rules, providing an additional layer of control before any action is executed.

How Atlas helps optimize Three.js performance and memory?

In 2026, managing GPU memory and optimizing render loops are critical for performant Three.js applications, and Atlas can directly assist. It identifies opportunities to add `dispose` paths for geometries and materials, and move object allocations out of the `requestAnimationFrame` loop, often improving performance by 10-20%.

Three.js applications, especially those with complex scenes or many dynamic objects, can suffer from GPU memory leaks if geometries, materials, and textures are not properly disposed of when no longer needed. Atlas can analyze your scene graph setup and render loop to identify where `dispose` paths are missing. You can ask Atlas to "add a dispose path for geometries, materials, and textures so unmounting a scene stops leaking GPU memory" in files like `src/scenes/MyScene.js`. Furthermore, per-frame object allocations within the `requestAnimationFrame` loop can introduce significant garbage collection overhead. Atlas can help move these allocations out of the loop, suggesting refactors to use reusable `THREE.Vector3` or `THREE.Matrix4` instances, thereby reducing performance bottlenecks and ensuring smoother 3D experiences. Atlas computes a unified diff for every file edit and surfaces it for approval before writing, giving you full control over these optimizations.

How Atlas integrates with Three.js development workflow tools?

Atlas direct integrates with the standard Three.js development toolchain in 2026, including `npm` for package management, `vitest` for testing, and `prettier` for code formatting. This ensures that any changes Atlas proposes or implements align with your project's existing quality and style standards, requiring minimal manual intervention.

A key aspect of onboarding to any codebase is understanding its development workflow. Atlas is designed to work within your existing Three.js ecosystem. It recognizes your `package.json` dependencies, including `three`, and can interact with your chosen test runner and formatter. For instance, after Atlas suggests a change,perhaps optimizing a `ShaderMaterial` or adding a `dispose` call,it can run `vitest` behind a permission prompt to verify that the change hasn't introduced regressions. You can also have Atlas `prettier` the unified diff it computes for every file edit, ensuring that the proposed changes adhere to your project's formatting rules before you approve them. Atlas connects to Model Context Protocol servers and exposes their tools to the agent, allowing it to leverage your local development environment effectively for Three.js specific tasks.

Step by step

01Initialize Atlas in your Three.js project: Navigate to your project root and run `atlas`. Atlas will read your `package.json` to understand your `three` dependency and project context.
02Semantically search for core Three.js logic: Ask `atlas codebase_search "how are Three.js scenes initialized and rendered, including materials and lights?"` to find relevant code snippets in files like `src/main.js` or `src/scenes/MyScene.js`.
03Map the Three.js project's directory structure: Use `atlas glob "src/*"` to quickly identify key Three.js-specific directories such as `src/components/`, `src/shaders/`, and `src/assets/`.
04Deep dive into critical Three.js files: `atlas read src/scenes/MainScene.js` to examine a core scene file, then use `atlas lsp goToDefinition "THREE.MeshStandardMaterial"` to trace material definitions and their usage.
05Safely explore for specific Three.js patterns: Delegate broad searches with `atlas task explore "find all custom GLSL shader files in the 'shaders/' directory and summarize their purpose"` to the read-only subagent.
06Record your Three.js insights and open questions: Use `atlas todowrite "Investigate texture loading strategy in src/utils/textureLoader.js and its impact on performance." ` to preserve your mental model for future turns.
07Optimize Three.js memory management: Ask `atlas task "add dispose paths for geometries and materials in src/components/AnimatedObject.js to prevent GPU memory leaks." ` and approve the computed diff.
08Verify and format Three.js code changes: After Atlas proposes edits, run `atlas bash "npm run vitest"` to check for regressions, then `atlas prettier --write src/scenes/MyScene.js` to ensure formatting consistency before committing.

Frequently asked questions

How does Atlas find Three.js scene setup without knowing specific filenames?: Atlas uses hybrid semantic and keyword retrieval, indexing code by AST declarations with tree-sitter. This allows it to understand the meaning of your Three.js code,like `new THREE.Scene()` or `renderer.render(scene, camera)`,regardless of the file path, providing highly relevant snippets from files such as `src/main.js` or `src/app.ts` that define core 3D logic.
Can Atlas help me understand GLSL shaders in a new Three.js project?: Yes, Atlas can read and analyze GLSL shader strings inline in your JavaScript/TypeScript files or in separate `.glsl` files. You can use `codebase_search` to ask "how are custom GLSL shaders defined and used in materials?" or `task explore` to "find all GLSL files and summarize their inputs and outputs," providing a clear overview of the project's custom rendering effects.
Is it safe to let Atlas explore my Three.js codebase?: Absolutely. The `explore` subagent operates with a `deny-by-default` permission set, allowing only read-only tools like `grep`, `glob`, and `read`. Every Atlas tool call is permission-gated, and any proposed file edits are presented as a unified diff for your explicit approval before writing, ensuring your Three.js project remains untouched without your consent.
How does Atlas integrate with `npm` and `vitest` in Three.js projects?: Atlas recognizes your `package.json` and can execute `npm` commands via its `bash` tool, such as `npm install` or `npm run dev`. For testing, Atlas can run `vitest` behind a permission prompt, allowing you to verify changes. It also integrates with `prettier` to format any proposed diffs, maintaining your project's code style and ensuring consistency with your existing Three.js development practices.
Can Atlas prevent GPU memory leaks in Three.js applications?: Yes, Atlas can identify areas where Three.js geometries, materials, and textures are created but not properly disposed of. You can instruct Atlas to "add `dispose()` calls for all unused Three.js objects when a scene unmounts," helping to prevent common GPU memory leaks that can degrade application performance and stability over time, especially in complex 3D scenes.
What Three.js specific files or patterns does Atlas prioritize during onboarding?: Atlas prioritizes files and patterns related to scene graph construction (`THREE.Scene`, `THREE.Camera`, `THREE.WebGLRenderer`), object creation (`THREE.Mesh`, `THREE.BufferGeometry`, `THREE.Material`), animation loops (`requestAnimationFrame`), and resource loading (textures, models). It also understands common Three.js project structures like `src/scenes/`, `src/components/`, and `src/shaders/` to quickly orient you.
How does Atlas handle `requestAnimationFrame` loops in Three.js for performance?: Atlas can analyze your `requestAnimationFrame` loops to detect per-frame object allocations, such as `new THREE.Vector3()` or `new THREE.Matrix4()`. It can then suggest refactoring these to use pre-allocated, reusable instances, significantly reducing garbage collection overhead and improving the smoothness and performance of your Three.js animations and interactions, which is crucial for a responsive 3D experience.

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