The Building Coder

Revit API Agents, MCP, Copilot and Codex

AI is growing more widespread and useful in the AEC, BIM and even Revit API arena – Global AI statistics and charts – AI challenges for complex app coding – What is agentic AI? – MCP gaining traction – MCP server for Fusion – Revit MCP – GPT prompting guide – OpenAI o3, o4-mini and Codex – M$ AI packages, VS Code and Codex – Codex analyses Revit add-in – Gemini ranks high – Chef generates and launches full stack – DeepWiki analyses all GitHub repos – MarkItDown converts anything to MD – Postmortem of a startup – Demystifying shebang... Read more →

Intersection Result, LLM for IFC and More AI

Revit API curve intersection, LLMs interaction with AutoCAD and IFC, and more AI-related news – IntersectionResult properties – LLM interaction with AutoCAD and IFC – AI literature and roadmap – Vibe coding parody – Collapse of critical thinking – IDA iterated distillation and amplification training – A2A agent-to-agent protocol – OpenAI GPT 4.1 + mini + nano... Read more →

Lookup Foundation, RevitLookup and DA4R 2026

In immediately reaction to the release of Revit 2026, DA4R and RevitLookup follow suite – The Lookup Foundation – RevitLookup 2026 – Dashboard, Summary, Settings pages – Unit and Modules dialogues – LookupEngine – Design Automation API for Revit 2026 – Vibe programming Revit macros – Direwolf fast Revit data extraction – From floppies to a memory stick... Read more →

Revit 2026, Empty Assets and Demolished Stuff

New major release of Revit and a bunch of API solutions for the existing ones – What's new in Revit 2026 – Empty appearance asset element – Retrieving demolished room data – RST results package creation – RST ResultsBuilder SDK sample... Read more →

Revit Gen AI: MCP, RAG and Vibe

AI-related news keeps piling in fast – Revit Vibe: generative AI in the BIM – Revit MCP connector – Convert Revit API help file to RAG for LLM – AI effect on programming jobs – Nice Jupyter interactive graph – Art is theft... Read more →

Docs, Local APS LLM and Parallel Task Orchestration

RvtDocs online Revit API docs, run free local open-source LLM queries on your BIM, and orchestrate add-in tasks in parallel on multiple servers – Revit parallel task orchestration on the server – Task queue controller – RevitRunner class overview – Creating the manifest – Updating the journal – Implementing the command – Setting up the development environment – Parallel execution on multiple Revit instances – Managing Revit instances – Moore's law for agent autonomy: 7 months – Conversational voice generation... Read more →

DevCon, API Docs and Fabrication Part Service

My last Autodesk conference nears, new and updated API documentation online, and a tutorial-style exploration of fabrication parts – DevCon in Amsterdam – CivApiDocs Civil3D API documentation – ApiDocs Revit 2025 API docs – Fabrication part show service... Read more →

Access UIApplication and Bounding Box on Sheet

A lot of my attention is on family matters; a couple of Revit API solutions also caught my attention – Preface to the Orchid Pavilion poems – Access UIApplication anywhere – Determine element bounding box on sheet – AI and human coding – XOR – Three horizons... Read more →

Unit Testing and More Serious Matters

Exciting things, personally, globally, technically and politically – Life, death, turmoil – Retirement, recruiting, job offer – New Rev API docs – Ricaun.RevitTest unit testing framework – ForgeTypeId for other parameter group – Exporting IFC using DA4R – Using Revit API from a web app – GenAI impacts critical thinking – New AI AGI test suites – uv Python package and project manager... Read more →

Tools for Extensible Storage and OAuth Auth0

Revit API tools for extensible storage and OAuth Auth0, notes on AI news, a Mac feature and electrical energy storage – SchemaMigrations extensible storage lib – OpenAI ChatGPT deep research – OAuth Auth0 in a Revit add-in – Docling markdown generator – MacOS copy paste sans formatting – DIY open source redox flow battery... Read more →

API Context and Extensible Storage in DA4R

A solution to use extensible storage in the APS Design Automation for Revit API – Check for valid Revit API context – External service enables extensible storage in DA4R – PackageBuilder versus RevitAddinUtility – Two ways to determine elements in section view – Python and .NET – Opting out of cookies... Read more →

Access to UIApplication, Tags and LLM API Support

Continuing my LLM explorations, Revit API highlights and other stuff of interest – Revit API support with Gemini LLM – UIApplication access – Relationship between tagged element and tag – Self-operating computer framework – BigBlueButton and conferencing tools – Internet security and privacy – Postel's law, the robustness principle – Stargate cost comparison... Read more →

Wall Layer Voodoo and Prompt Optimisation

I dabbled further with LLMs and prompt optimisation – Wall centre, core and face references – Promptimalising my Revit API support prompt – Generate 3D model from single 2D image... Read more →

LLM Prompting, RAG Ingestion and New Projects

New projects and progress using LLMs for Revit API – Add-In wizard 2025 – DirectContext3D video – Rvt-App browses BasicFileInfo – Revit API support prompt – pyRevit scripting prompt – Promptimal prompt optimiser – Jupyter Forge viewer – Superhuman multi-player poker – OpenAI o1 hacks and cheats – Writing Doom short film on superintelligence – Cosmos for physical AI – MarkItDown converts files to Markdown – NV-Ingest parses documents for RAG – Gitingest makes GitHub repos LLM-ready – LangSmith intro and LLM for dummies... Read more →

Back Again to Unit Test, Icons, Viewports and More

Back again! – Winding up – Multi-version NUnit test – Hires Revit icons – Retrieve and update viewport types – Interact with BIM via ChatGPT – Expertise in real world contexts – Humans versus LLMs completing ARC-AGI – 2024 AI breakthroughs & controversies – LLM transformers – Short movie by Veo 2 – Current AIs are not politically neutral – Mind-reading potential of AI – Iterative spell check with Gemini... Read more →

DevCon, AI for Revit API, Modeless Add-Ins, Leave

I will be away a most of the rest of this year, and leave you with the following exciting mix of very good and very bad news – DevCon Europe call for papers – Retirement and away on leave – ChatGPT for Q4R4 – First LLM forum solution – Modeless WPF add-in sample and tutorial – The bitter lesson – Brain drain: David vs Goliath – AI effects on human creativity – HTML for people – UN climate change efforts off track... Read more →

AU API Wishes and Revit 2025.3

AU is over and Revit 2025.3 has been released – Revit 2025.3 SDK – Boost Your BIM AU API wishes – Claude computer use does stuff... Read more →

Determine RVT Version and Add Data from EXE

Determine RVT file version and add extensible storage data from EXE, AI- and tech-related news – Determine RVT file version – RVT file version with RevitExtractor – Add extensible storage data from EXE – Tesla autonomous vehicles and robots – State of AI Report 2024 – Nobel prize for science – AI illiteracy and misuse – The techno-pro attitude – Jevons paradox... Read more →

Unload Links Offline and Filter for Types

Standard filtering questions and a typical use of transmission data – Parameter filter to delete viewport type – Cannot delete type in use – Determine coordination model filepath – Unload links with transmission data... Read more →

Join Beams and Solid from Face

Creating an open shell, a solid extrusion from a face and defining a precise join between structural beams – DirectShape solid from planar face – Join between three beams... Read more →

RevitLookup 2025.0.9

New versions of RevitLookup are available, and AI influence observable – RevitLookup 2025.0.9 – Revit.ini file editor – Dependency conflict static analyzer – Public RevitLookup roadmap – Other improvements – RevitLookup 2025.0.10 – LLMs influence academic language... Read more →

Solid Boolean Operation Alternatives

How to handle problems with solid Boolean operations? – Revit Booleans and OpenCascade – CGAL solid Booleans... Read more →

MEP Cable Tray Bend and Tee Analysis

A quick dive into the geometric analysis of various MEP fittings – Cable tray bend radius – Tee branch identification... Read more →

Element Visibility and Multi-Version Add-In Code Base

Current and recurring topics from the Revit API discussion forum, an LLM and a cultural colour topic – Multi-version add-in code base – UIView for element visibility – GPT reads PDF + generates ACC issues – My blue vs. green ... Read more →

API Context, Background Process, PostCommand

More aspects of the Revit API from a modeless context – Background process and Revit API – Revit background processor – Effective Revit API context predicate – PostCommand context and view focus – Protect creativity with no AI – European Union AI Act – The Sakana AI Scientist – Plasma in high school nuclear fusion reactor... Read more →

Modeless Add-Ins and PDF Printing Speed

Topics discussed in the past week – Simultaneous add-in and Revit interaction – Limited PDF printing speed – Family instance code samples – Apple intelligence foundation language models – LLM arena... Read more →

Link Filter, Ceiling and Link Hatch Dim Voodoo

Fresh looks at dimensioning voodoo with stable representations, accessing and filtering elements in linked files, and transient graphics for jigs – Stable representation voodoo for hatch dimensions – Dimensioning hatch pattern on ceiling – Dimensioning hatch pattern in linked file – Filter elements in linked file – RubberBand jig... Read more →

Stable Parameter Identifier and WebView2 Plans

Embedded browser plans are maturing further, and what to use for stable parameter identification – Move from CefSharp to WebView2 – Stable parameter identifier for use in formula – CrowdStrike outage – Ai models trained on AI-generated data collapse – Open source AI is the path forward... Read more →

APS Accelerator and Q4R4 Chunking with Claude

Vacation time, accelerator time, and chunking TBC for LLM RAG – APS accelerator Barcelona in September – Q4R4 with LLM and RAG – Claude.ai helped chunk TBC blog posts – Vacation... Read more →

Material Assets, Chromium and Sorting Schedules

Material assets, built-in browser functionality, create schedules, search text and miscellaneous LLM-related news items – Personalised material asset properties – CefSharp versus WebView2 embedded browser – Twentytwo on schedule creation – Ugrep enhanced grep – AI mesh understanding – LLM self-reflection, deep stupidity, sans MatMul, and locally the easy way... Read more →

Length Query and RevitLookup Heralds DLL Paradise

New RevitLookup solves Revit add-in DLL hell, and a clarification on the arc length properties provided by curve elements – Curve Length versus ApproximateLength – RevitLookup dependency isolation ends DLL hell – Add-in dependencies isolation... Read more →

Entitlement API for Revit, Licensing for Add-Ins

Two illuminating posts from the Revit API discussion forum on licensing and the entitlement API – Multi-version Revit entitlement API – Add-in licensing... Read more →

RevitLookup Geometry Visualisation

New RevitLookup BIM element geometry visualization, and 1000 GitHub stars – Versions 2025.0.5, 2025.0.6 and 2025.0.7 – Wiki... Read more →

Removing Docs Zip Files, Panels and Buttons

A call for feedback on a planned change downloading a RCM from Docs, a tricky solution to remove ribbon panels and buttons, and a bunch of news bites that I found interesting on sustainability, language and AI discoveries; new EU AEC energy ruling, ecological wooden buildings in Scandinavia, spoken human language speed and information density, AI uses as a hearing aid enhancement, weather forecasting, interface assistant, AI open-source and future directions... Read more →

Revit 2025 API Video and Hiding Linked Elements

The video recording on what's new in the Revit 2025 API has been released, and we discuss a nice example combining element pre-selection and PostCommand – Revit 2025 API video – Hiding linked elements... Read more →

Revit 2025.1 and Handling Lack of UI in DA

The Revit 2025.1 update release, placing a detail group in ASP Design Automation, lacking the UI, a hacker's guide to LLM and an LLM retrieval augmented generation in 10 lines of code... Read more →

RevitLookup Updates, Bounding Boxes and Podcast

New releases of RevitLookup vastly expand coverage to include numerous new classes and properties – BIMrras podcast interview – RevitLookup 2025.0.3 – RevitLookup 2025.0.4 – Outline versus BoundingBox – Linking Revit files in BIM360 Docs... Read more →

Lengthen Ducts and Highlight Links

Modifying duct length, highlighting linked elements using SetReferences and determining whether a form is currently displayed by implementing an IsMainWindowActive predicate... Read more →

Migrating VB to .NET Core 8 and AI News

Revit 2025 API migration of VB.NET add-ins to .NET Core 8 and advances in LLMs and AI, Claude, ChatGPT, Gemini, Meta AI, 3D genAI, web scraping, spatial referring, digital twins... Read more →

What's New in the Revit 2025 API

The Revit 2025 API contains significant enhancements for add-in developers – Information sources – What's new in previous versions – Detailed table of contents – API Changes – API Additions... Read more →

Migrating from .NET 4.8 to .NET Core 8

The Revit 2025 API is based on .NET Core 8, upgrading from the previous .NET 4.8 framework – .NET Core migration webinar recording – Revit API .NET Core migration guide... Read more →

RevitLookup Hotfix and The Revit 2025 SDK

RevitLookup HotFix 2025.0.1 has been released, and I continue the exploration of the Revit 2025 API – Revit 2025 SDK download – Comparison with previous SDK – Integration into RevitSdkSamples – Compiling the Revit 2025 SDK samples – Custom add-in context menu... Read more →

The Building Coder Samples 2025

I migrated The Building Coder samples to Revit 2025 – Compilation environment – .NET upgrade assistant – Revit API assemblies – Errors and warnings – Conclusion... Read more →

Revit 2025 and RevitLookup 2025

Revit 2025 has been released and the new Revit API is now based on .NET Core – PackageReference versioning support – RevitLookup 2025 – Revit developer starter kit – Revit 2025 macros with Visual Studio 2022 – Cheap Chinese AI chip... Read more →

Change Pipe Level and PreviewControl Border

Picking up two illuminating conversations from the Revit API discussion forum, we look at spying to suppress the PreviewControl border and changing the level of piping elements... Read more →

Camera Settings, Doors Traversed, Script on the Fly

New exciting Revit API solutions and furious pace of LLM development – Bowerbird C# scripting for Revit – Doors traversed by path of travel – Camera mapping between APS and Revit – Claude 3 can see – Devin, an AI software engineer – Meta Imagine generates images – An LLM for decompiling binary code – Simple climate change overview... Read more →

API Context, Input State and DA4R Debugging

We present a long-awaited solution to check for a valid Revit API context and a whole bunch of short pointers to other mostly AI-related topics of interest – Determining Revit API context – Detect Revit user input state – Easy Revit API – Gemini with image and video input – LLM is not self-aware – Generative AI transformer – Design to reduce junk data – C and C++ are risky – Ultra-processed food is toxic... Read more →

Interactive BIM Notebook, Temporary Graphics and AI

Interactivity and AI keeps growing – BIM interactive notebooks – TemporaryGraphicsManager in action – Classify line styles built-in vs user – The curious case of JavaScript – Magika AI-based file type classification – NotebookLM – AI understands videos better – Airline chatbot invented a refund policy – LLM tokenisation – Diátaxis systematic technical documentation – Amara's law – Talking about progress versus risk... Read more →

Refresh Graphics, Start View and Excel

Refreshing graphics, exchanging data, setting the start view, and random titbits related to AI, politics and climate – UpdateAllOpenViews – Refreshing spot elevation prefix – Excel data exchange options – Defining the start view – How big is a LLM – Base rate fallacy – Last year was hot – Previous climate changes negligeable – PV panel price trend... Read more →

.NET Core, C4R Views and Interactive Hot Reloading

Importing cloud-based APS parameters in desktop project, pondering .NET Core, publishing views the cloud, and hot tips for hot reloading for interactive Revit API testing and debugging – APS parameters API Revit import – .NET Core migration webinar recording – C4R publish view to cloud API – Revit polyglot notebook – Hot reloading in Visual Studio With Dynamo and Revit – Assigning invisible graphics linestyle – ChatGPT system prompt – RIP John Walker... Read more →