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Pascal Editor

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GitHub TypeScript MIT

Description

Open-source local-first 3D building editor built with React Three Fiber and WebGPU, connecting AI agents through MCP to read and edit scenes from the browser or CLI.

Key Features

  • Local-first runtime — a single npx command starts a persistent local service with projects kept in ~/.pascal
  • MCP agent access — a built-in MCP server exposes scene tools, resources, and prompts to Claude Code, Codex, and other hosts
  • WebGPU 3D rendering — a React Three Fiber runtime with stacked, exploded, and solo level viewing modes
  • Node-based scenes — Site, Building, Level, Wall, and Zone nodes live in a flat dictionary with Zod schemas and undo/redo
  • On-demand geometry systems — WallSystem, SlabSystem, and friends recompute only dirty nodes, with CSG cutouts for doors and windows
  • Plugin extensibility — new node kinds and side panels ship as plugins using the same manifest as the built-ins

Use Cases

💡 Direct an AI agent in natural language to lay out floors, walls, and furniture while MCP syncs the scene.
💡 Embed the @pascal-app/viewer package in a web app to add 3D floor-plan or spatial visualization to your product.
💡 Write custom node plugins to extend the editor with procedural assets such as trees and vegetation.
💡 Keep housing layout projects on your own machine thanks to local-first storage.

Strengths & Limitations

✅ Strengths

  • • Actively maintained, recent updates
  • • High community interest (23.0k stars)
  • • Permissive open-source license (MIT)
  • • Responsive to issues, low backlog

Tags

3d-editor mcp webgpu building-design agent

Categories

🔌 MCP Tools ⚡ Agent Tools

Quick Start

# Start the local editor (requires Node.js 22.13+)
npx @pascal-app/cli editor
# Configure the MCP connection for Claude Code
pascal mcp setup claude
# Install the official agent skills
npx skills add pascalorg/editor --skill pascal-3d --skill furniture-fit
# Develop from source
bun install
bun dev
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