The Building Coder

Sketch-Based Creation and Editing API Preview

The wish to be able to programmatically access and modify sketch-based elements is long-standing, e.g., for editing an existing slab boundary. Here is an invitation to take a look at the Revit Preview (aka beta), offering a chance to provide feedback on several new sketch-based element creation and editing APIs... Read more →

FireRevit, Deprecated API and Elbow Centre Point

Topics for today – Revit 2021 DisplayUnitType – Eliminated TBC samples deprecated API usage – Calculating the elbow centre – FireRevit identifies room location for fire escape routes... Read more →

High Performance Outline, Line-Plane Intersection

Today let's talk mainly about geometric analysis and performance – High-performance outline optimisation – Simple line-plane intersection – Set base and survey clipped and unclipped – Two German uni BIM360 construction cloud startups – AI-based face streaming hits mainstream... Read more →

Custom Parameters and Tile Packing

Parameter changes and tile packing using the Revit API and AI, plus some other notes on Forge and general stuff – Parameter type changes to Custom – Determining cut tiles in room – Optimal banana sandwich slice packing with AI – Forge solution showcase – Effect of home office on meeting culture – Motivating kids can be harder than business success... Read more →

Section to Crop, Linked Boundary and Intersection

Two beautiful Revit API solutions to – Set view crop to section box and – Access room boundaries and intersections in linked models... Read more →

Split Pipe Tutorial and Related Cases

Today, let's focus on splitting pipes and other things, starting with a nicely structured tutorial – Abdelaziz' split pipe tutorial – Calling the SL split element command – Splitting a conduit... Read more →

Automatically Open Correct RVT File Version

Today, let's address a couple of quick questions and share a useful utility – How to determine Revit export image coordinates – Problems compiling and installing the Revit SDK samples – RvtVerFileOpen utility opens correct RVT file version – Angular and react tutorials – Give and take... Read more →

Using ReferenceIntersector with a Linked File

Here are our topics for today – What is Forge in 90 seconds – Locally opening RVT file managed by BIM360 – Programming tools for Robobat – Using ReferenceIntersector in linked files... Read more →

Convex Outer Loop, Non-Migration and 15-Year Stint

Various noteworthy items this week, both Revit API related and not – My second stint of 15 years at Autodesk – Forge trainee career launched – Why does my add-in still run? – Determine outer loop around points... Read more →

References to Symbol versus Instance Geometry

Sooner or later, every serious Revit add-in developer will be scratching her head a bit over symbol versus instance geometry. Here is a nice juicy challenge... Wrap you head around this one in depth and future challenges in this area will seem trivial. Retrieving references from symbol versus instance geometry when placing an instance on a line throws an ArgumentsInconsistentException... Read more →

Stair Point References, BIM360 Users, Zoom, Jobs

I hope you and your friends and family are all safe, sound and managing well. Our main solution today reveals a new trick handling multistory stairs – Point element references in multistory stairs – BIM 360 GET project users API – Zoom tips – Jobs at Autodesk... Read more →

Satellite Images and Instance Transforms

I hope you are doing well and remaining healthy! Topics for today – Transforming symbol geometry to instance placement – Importing and displaying satellite images – Free time? Learn! Free code camp... Read more →

Autorouting and Reference for CreatePipeConnector

Today we pick up two recent MEP related discussions, on creating a new pipe connector for a hydraulic fitting family and on automatic pipe system routing, and a couple of other odd items – The names they are a-changin – Getting a ReferencePlane for CreatePipeConnector – Auto-routing a pipe system between plumbing fixtures – Handling dialogue and failure messages – Retrieving a geometry reference... Read more →

Command Binding Conflicts and Face UV Coords

Today, let's pick up two recent discussions on the UV coordinate space on a face and the replacement of add-in command bindings – Understanding the Face BoundingBoxUV – Handling add-in command binding conflicts... Read more →

Adjust Wall Location Curve and Visual Presentation

An exciting discussion on applying minimal adjustments to the model, and yet another research result on the effectivity of visual presentation – Adjusting versus recreating wall location curve – Multimedia communication versus bullet points... Read more →

Ini File, Localisation and Torsion Tools Two

More Revit API tutorial material and tools, plus a couple of hints from the Revit API discussion forum and the Forge blog – Torsion Tools two – Retrieve path to Revit.ini – Updated NeXLT localization URL – Volume and area of triangulated solid... Read more →

Search for Getting Started Tutorials and Videos!

Getting started material and questions galore. Please search before asking, and work through the available material before trying to shoot yourself in your feet, knees, and elsewhere – Marko's plugin development playlist – Overview – Table of contents – Getting started with an API script – Getting started with a macro – OBJ mesh import with materials – 2D Booleans in the Revit API... Read more →

Unit Testing and the UsesInstanceGeometry Method

Quick notes on two recent interesting Revit API discussion forum threads – Unit testing – UsesInstanceGeometry IFC utility method... Read more →

Swissbau Basel and Comparing Family Part Atoms

Here is a last-minute announcement that I will be attending the Swissbau Basel on Wednesday, a quick hint to answer a support case that just came in today, a forum thread issue, and a pointer to a drum solo – Attending Swissbau Basel on Wednesday – Comparing families using part atoms – Maximum area rectangle in polygon – Neil Peart drum solo... Read more →

Extrusion Analyser and 2D Boolean Element Outline

Happy New Year to the Revit add-in developer community! My main holiday project was the implementation of an external command to determine the 2D plan view outer boundary of a room in the XY plane, including all its bounding elements' geometry – How to generate a 2D polygon representing the birds-eye view of an element – CmdExtrusionAnalyzer element outline using ExtrusionAnalyzer – Cmd2dBoolean element outline using 2D Booleans – CmdRoomOuterOutline outer room outline using 2D Booleans... Read more →

Dashboard, CreateViaOffset and Room Outer Outline

An inconclusive struggle to use CurveLoop.CreateViaOffset leads us once again to thank the powers that be for the integer-based 2D Boolean Clipper library, and some thoughts on project dashboards – Extracting data for project dashboard – Specifying a list of offsets to CreateViaOffset – Alternatives to determine room outline including surrounding walls... Read more →

Cyrillic Lookup, Moving Grids and Combining Edges

Topics to start this week – Why SVG? – Internet privacy – Pointless meetings research – Cyrillic characters in lookup tables – Moving a grid – Combining edges... Read more →

Curve Projection, Detach and FBX in DA4R

Two little hints on Forge Design Automation for Revit or DA4R issues, projecting a curve onto a planar surface and an impressive list of add-in video samples – DA4R supports FBX and IFC – DA4R wrong user – Projecting curves onto a plane – Revit add-in versus Dynamo zero-touch node – Revit add-in sample videos... Read more →

Automated PDF Report and 2D Sketch Booleans

Today, we highlight two contributions by Håvard Leding and Oliver Green – 2D Boolean interactive real-time sketch viewer – Single-click automated PDF report via InDesign – Abbreviated table of technical contents... Read more →

DevCon Invitation and Dynamo for Infrastructure

Let's highlight another class from BILTNZ and a personal invitation to the upcoming DevCon in Las Vegas – Invitation to Forge DevCon in Las Vegas – Visual Programming in Infrastructure – Class description – Table of contents – Placing an instance along an edge – Most popular programming languages 1965-2019... Read more →

Extensible Storage, External Event, DLL, Pipe Face

Preserving another couple of interesting recent threads from the Revit API discussion forum on various extensible and external topics – Extensible storage reading trouble – External event implementation – External DLL loading – External side face of a pipe... Read more →

Cylinder Intersection and Vision of Online Assets

A surprising new aspect of Revit's built-in solid intersection algorithms and a ten-year vision for online assets – No face to face intersection without edges – Evolution of media creation – Vision of online assets... Read more →

Parameters and Hiding DirectShape Edges

I still have a backlog of questions from last week to process. Here are some of the discussions that came up – Shared parameter is either type or instance – Transferring element parameters – Hiding DirectShape internal face edges... Read more →

Face Intersect Face is Unbounded

My work on setting up a new PC is nearing completion. There is also a need to clarify the use of the Face.Intersect(Face) method – The unbounded Face.Intersect method – Making use of the unbounded face intersection – Rectangular face intersection ideas – Copy as HTML update – Visual Studio Revit add-in wizard update... Read more →

MEP Ductwork and Changing Pipe Direction

One of today's Revit API discussion forum threads prompted a discussion of MEP duct- and pipework creation topics – Changing pipe direction – MEP ductwork creation tip... Read more →

New PC, KLH Snoop, Annotations and Vertex Handling

I have been very busy and motivated indeed setting up a new computer this week. Nonetheless, I was able to keep going full steam with Revit API related issues as well – Setting up a new MacBook – KLH Engineers RevitDeveloperTools snooping tool – Pulling text from annotation tags – Vertex handling – The true meaning of pizza... Read more →

Auto-Dimension Filled Region Boundary

I am back from my break and picked up the question about creating dimensions for a filled region boundary – Programmatically creating dimensions for a filled region – Coding suggestion – Final solution... Read more →

Room Volume glTF Generator

I travelled home from the Barcelona Forge accelerator and continued working on the room volume exporter. I now implemented support for glTF, the GL Transmission Format. A few more little items to wrap up the Barcelona topic – Kean Walmsley's report on this year's Forge Accelerator in Barcelona – My two favourite restaurants in Poblenou... Read more →

Room Closed Shell DirectShape for Forge Viewer

I explored three main topics here at the Forge accelerator – Room closed shell solid visibility in the Forge viewer – Rebar simplification: replace rebar elements with simplified solids or model curves – glTF export – Today, I'll dive deeper into the first – IFC exporter utility adds new built-in parameter – Barcelona Forge accelerator – Room closed shell in the Forge viewer – Triangulate the solid face by face – Triangulate entire solid – Tessellation accuracy control documentation error... Read more →

DirectShape Element to Represent Room Volume

Yesterday, I implemented a new add-in, RoomVolumeDirectShape, that creates DirectShape elements representing the volumes of all the rooms – Request to display room volumes in Forge SVF file – RoomVolumeDirectShape functionality – Retrieving all element properties – Converting a .NET dictionary to JSON – Generating DirectShape from ClosedShell – Complete external command class Execute method – Sample model and results – Challenges encountered underway – Cherry BIM Services – On the value of the "Loss Method" property – AI-generated talking head models... Read more →

Retrieving Section View Intersection Cut Geometry

I played around creating a new SectionCutGeo add-in to retrieve the geometry resulting from cutting a family instance in a section view. This was prompted the Revit API discussion forum thread on getting intersection lines from cut in section view – Intersection of section and family instance task – Solution options, geometry elements and view settings – Retrieving curves in the cut plane – Helper methods and external command mainline – Sample model and results – Caveat... Read more →

Secret Reference Line Faces

The open source space around the Revit API is continuously growing richer, solutions are shared and exciting discoveries are made, both in the Revit API discussion forum and elsewhere – Debugging, code signing and HOK Mission Control – Creating connectors on a reference line... Read more →

Spatial Geometry, Add-In Manager and Show Reels

New Autodesk show reels, a solution to the lack of an add-in manager in the Revit 2020 SDK, an update for the SpatialElementGeometryCalculator and an interesting observation on English spelling – 2019 Autodesk show reels – The Add-In Manager for Revit 2019 still works – Spatial element geometry calculator update – English spelling... Read more →

AI, Boundaries, Loops and RevitApiDocs 2020

Yet another eagerly awaited update for the Revit 2020 API, a couple of interesting Revit API discussion forum threads, and some thoughts on how AI might affect and be used in an architectural context – RevitApiDocs updated with the Revit 2020 API – More room boundary segments than expected – How to get width and height of a CurveLoop – AI and architecture... Read more →

Determine Exact Opening by Demolishing

We have looked at numerous different approaches to determine wall openings in the past, so it seems pretty hard to nail down, and pretty important to solve. Now Håvard Leding of Symetri contributed yet another exciting idea which highlights a number of surprising aspects, demonstrates a further creative use case for GetDependentElements and expands on his recent RevitLookup enhancement to retrieve and snoop dependent elements – Get demolished solid – Why? – Questions... Read more →

Scaling, Face and Mesh Triangle Normals

Let's look at a couple of scaling and triangle orientation issues that recently came up – Transform and scaling in Forge – ModPlus and scaling text in dockable panel – Exporting view image extents – Mesh triangle orientation – PlanarFace normal... Read more →

Creating a Sweep with Multiple Closed Loops

A demonstration of using the NewSweep method was very kindly provided in yet another helpful answer by Frank @Fair59 Aarssen to the Revit API discussion forum thread on how to create a sweep with multiple closed loops in profile. Let me also highlight an interesting TED talk on the topic of poverty versus universal basic income – Creating a sweep with multiple closed loops – Poverty versus universal basic income... Read more →

Stable Reference Relationships

Håvard Leding explores relationships between stable reference of main elements and their sub-elements, related to the intriguing undocumented ElementId relationships and stable representation magic voodoo. We need to access the sketch association to the element being sketched. I printed out stable references for 3 floors, and also the references for each ModelLine in their 3 Sketch elements... Read more →

Link in and Analyse IFC File Zones and Spaces

I am working on extracting room and zone information from IFC files, both geometry and relationships, specifically room and zone boundaries and containment. My new IfcSpaceZoneBoundaries add-in project retrieves this information, exports it to CSV and demonstrates a host of other important aspects – What happens on linking in an IFC file? – Read user configuration input settings from a file – Log messages, warnings and errors to an output file – Read the IFC properties stored as shared parameters – Extract the horizontal boundary information from a DirectShape element – Export the relevant data to CSV – Programmatically link in an IFC file into a Revit RVT project – Retrieve all currently linked-in IFC files from the Revit application... Read more →

Face Methods and Custom Command Line Arguments

Inundated with interesting topics, let's skim a few topmost ones off – Passing an add-in custom command line parameters – Useful methods help verify a Face is rectangular – Automate complex family creation – C++ code extracts 3D line segments from point cloud – Big data visualisation and storytelling... Read more →

New RevitLookup Snoops Edges, Faces and Links

Håvard Leding of Symetri added three new commands to RevitLookup – Three new RevitLookup commands – About "Snoop Pick Face" – About "Pick Linked Element" – Running in a family document... Read more →

Room Boundaries to CSV and WPF Template

Happy New Year! I spent some time during the winter break working on CSV export of room boundaries for a Forge BIM surface classification tool. Ali Asad presented a new Visual Studio WPF MVVM Revit add-in template – Export room boundaries to CSV for Forge surface classification – Visual Studio WPF MVVM Revit add-in template... Read more →

Python Rotate Picked Around Bounding Box Centre

Let's highlight a nice interactive didactical Python-based Revit API learning challenge on how to get the bounding box from a Revit element and determine its centre – Cyril's Python HVAC blog – Rotating elements around their centre in Python – Retrieve element and bounding box from picked reference – Use location point instead of bounding box centre – Final working solution... Read more →

Rebars in Host, .NET Framework, Importance of Fuzz

Here are a couple more Revit API discussion forum threads well worth highlighting – Retrieve rebars attached to structural element – Installing the .NET framework 4.7 for Revit 2019.1 add-ins – Importance of fuzz for curtain wall dimensioning... Read more →

Fire Rating Zone Intersection

Let's tackle a 2D fire rating zone intersection task. Actually, it was originally raised a 3D intersection task. Reducing it to 2D makes it much more tractable – 3D solid extrusion creation and intersection task – 2D area intersection task – Jack's sample and description – Soffit subdivision sample code – Cleanup and GitHub repository... Read more →