🚀 CAD-(BIM)-to-Code Automation Pipeline with LLM (ChatGPT)

Revit (.rvt), AutoCAD (.dwg), IFC, MicroStation (.dgn) → Excel + AI-Generated Python Analysis — no Autodesk® or openBIM tools required

🔄 Built for fully offline workflows using n8n + DataDrivenConstruction Converters

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🛠 Features

• 🔄 Convert .rvt, .ifc, .dwg to:
  • 📊 Excel (element data as a matrix - project elements in the rows, all properties of all elements in the columns))
  • 🧱 Polygonal geometry (only Revit and IFC) into an open geometric format .dae (Collada)
  • 📋 Schedules (only for Revit)
  • 📄 Drawing Sheets (PDF) (only for Revit)
• ✅ Quality Control with validation rules
• 🤖 Ask AI to generate custom Python code
• 📈 Instantly get charts, stats, summaries from your model

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📦 Installation Guide

1. Install n8n on Windows

Before installing n8n, make sure Node.js (which includes npm) is installed:

• Download from: https://nodejs.org/en/download

npx install -g n8n
n8n start

or

npx n8n

Or download desktop app: n8n.io/download

2. Download Converters

Either use the converters that are in the repository or download the always fresh ones directly from the site:

Format	Converter	Download
Revit (.rvt)	RvtExporter.exe	Download
IFC	IfcExporter.exe	Download
AutoCAD (.dwg)	DwgExporter.exe	Download
MicroStation (.dgn)	DgnExporter.exe	Download

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⚙️ Quick Setup

1. Clone or import the workflow:
   ⬇ Download JSON file

2. In n8n, import the workflow via "Import from file".

3. Configure paths:

   • Set absolute path to RvtExporter.exe in the $INPUTS$ node.
   • Example:

     C:\out\DDC-Converters\RvtExporter.exe
     

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🎯 Workflow Overview

graph TD;
    A[📋 Upload RVT/IFC/DWG/DGN file] --> B[📁 Create Workspace]
    B --> C[⚙️ Run Pipeline-Converter]
    C --> D{✅ Success?}
    D -->|Yes| E[📥 Read Excel, PDFs, Schedules]
    D -->|No| F[❌ Show Error]
    E --> G[🔍 Validate with Excel Rules]
    G --> H[🤖 AI Code Generator]
    H --> I[📊 Charts, Stats, Python Output]

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💬 Example Use

• Upload your .rvt file
• Choose options: sheets, schedules, bounding box
• AI understands your prompt:

“Group by Type Name, sum Volume, and show a bar chart.”

You'll get the result instantly — no coding needed.

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📎 Extras

• 📘 Validation template: DDC Revit & IFC Validation Table
• 📊 Example AI-generated outputs: grouped tables, bar plots, summaries

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🧠 Powered by

• n8n
• DataDrivenConstruction.io
• Offline .exe converters (no Autodesk® tools required)

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🛟 Support

Need help or ideas for automation?
Visit 👉 https://datadrivenconstruction.io or open an issue in this repo.