The Building Coder

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 →

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 →

RBP, Materials, Their Assets and the Visual API

Two very different aspects of BIM materials, filtering for annotations and a powerful batch processor utility: – GetMaterialArea behaviour varies – Material assets and the Visual API – Filter for annotation families – Revit batch processor RBP... Read more →

IFC, Dimension and Reference Intersector with Links

Pros and cons of the reference intersector and how to use it with linked files and filtered element collectors, a design automation IFC exporter, dimensioning linked elements using the reference stable representation and new forays with large language models – Reference intersector with filters and links – Revit IFC exporter for APS DA – Stable representation voodoo with links – Running Dalai LLaMa locally – ChatGPT invented a game... Read more →

Pyramid Builder, CommandLoader, et al

Pyramid Builder, CommandLoader, and more – Dynamic load, compile and run code – DirectShape pyramids – Modify level element X and Y extents – How to filter for subsets of elements – Switch document display units – Material tags displaying '?' – Sublime Text... Read more →

Back to Basics and ChatGPT

Impressed and intrigued by what ChatGPT can and cannot do, trying out new aspects myself and with my friends – Element filtering – XYZ trigonometry – Projecting points – Using ChatGPT with Revit API – Generative AI and multi-modal learning – ChatGPT in academia, education, building a VM, DIY, payment plan, Solarpunk... Read more →

Instances in Room and Need for Fuzz

Common tasks include finding instances with a given room, comparing real numbers, and sharing documentation online – Get family instances within room – Again, the need for fuzz – Avoid PDF for on-screen reading... Read more →

Immutable UniqueId and Revit Database Explorer

A new initiative to improve RevitLookup, and take care handling and trying to convert between an element id and its unique id – Immutable UniqueId, mutable element id – Revit database explorer... Read more →

Outer Walls, Lookup Update and Filtering

Freshening up a few of our favourite recurring topics – RevitLookup update – Filtering for multiple built-in categories – Retrieving all outer walls – Zen and the art of React programming... Read more →

Utility Classes and Constraining Stirrups

Taking a look at yet another overlooked Revit API utility class, rebar constraints, and learning basics of power, energy, entropy and information – ParameterFilterUtilities – Constrain stirrup to host cover – Rowers illustrate power and building energy – Wordle entropy and information... Read more →

Revit Server and View Filter Alert

Non-API Revit Server access, exporting Outlook email text, and using a view filter to alert to missing data... Read more →

View Sheet from View and Select All on Level

Increasing numbers of of Python and Dynamo oriented topics in the Revit API discussion forum, and a final deprecated API clean-up – The Building Coder samples clean – Retrieving all elements on level – Get ViewSheet from View – Fabrication transaction in Dynamo... Read more →

Exterior Walls and Room Bounding Elements

Let's look at the outer boundaries of both buildings and rooms today – Finding exterior walls continued – Retrieving room bounding elements – Comic Sans is a public good... Read more →

Splits: Persona, Collector, Region, Tag, Modification

I need to come to terms with a split personality. Meanwhile, lots more going on in the Revit API discussion forum – Two Jeremys – Multiple collectors versus multiple filters – RevitLookup handles split region offsets – Python and Dynamo autotag without overlap – Custom errors and preventing changes – Ecological cost of crypto currency and art... Read more →

Parameter Filter Checking Element Type and OCR

An important insight in using a filtered element collector with a parameter filter, a handy open source OCR tool and a few productivity tips – Parameter filter also checks element type – Capture2Text, a handy OCR tool – Productivity tips... Read more →

Line Subcategory Filter, Modification Tracker and NW

I played around a bit with the NavisWorks API and discovered a nice Revit project modification tracking tool in Dynamo – Filter for detail lines subcategory – Revit project modification tracking – Retrieving all NavisWorks model properties – Node.js best practices – Early history of programming and C... 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 →

Preview, Code Signing and Element Type Predicates

A few interesting threads from the Revit API discussion forum and AI news – Revit add-in code signing YAML – Preview control rotates model – Element type predicates – AI ethics... Read more →

Selection in Link, Cancel in Export, Multithreading

Cool topics to wrap up this hot and exciting week – Are you using the derived analytical model? – Pick room in current project or linked model – Determine whether custom export was cancelled – Multi-threading with the single-threaded Revit API – Beginner’s guide to abstraction... 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 →

Getting Title Block Data and ViewSheet from View

Today, let's highlight two view related data access topics – Get ViewSheet from View – Title block data access... Read more →

Forge Rooms, Effective Filtered Element Collectors

I successfully made it from Switzerland to Paris and the Forge accelerator in spite of the French strikes. My only worry is how to get back again tomorrow. Again, the train I have booked has been cancelled. Meanwhile, let's take a look at – DA4R room support and new samples – Effective filtered element collection... Read more →

Get Project Parameter Id and Prevent Updater Loop

Let me once again highlight two helpful answers in the Revit API discussion forum and the newest pair of Forge Design Automation samples – Get project parameter id from its name – Preventing an updater loop – New Forge and Design Automation samples... Read more →

GetSimilarTypes, SnappingService and Title Labels

So many interesting discussions and inspiring solutions in the Revit API discussion forum! Here are a few, plus one non-forum beginner case – GetSimilarTypes filters for curtain wall door symbols – SnappingService – what does it actually do? – Get title block label parameters... Read more →

Filtered Element Collector Benchmark

Today, let's present a benchmark monitoring filtered element collector performance. First, however, a quick note on a very useful Forge learning resource – Forge learning resource – Filtered element collector benchmark... Read more →

Tagging a Linked Element

The linked file enhancements introduced in the Revit 2014 API obviously need more awareness – Link enhancements – Conversion of geometric references – Tagging a linked element – Using the stable representation to tag a linked element – List all untagged doors... Read more →

Location Point and Filtering Hints

I am probably doomed to spend the rest of my life telling people not to unnecessarily apply ToList to a filtered element collector. It happened several times again today answering questions in the Revit API discussion forum – Don't trust the family instance location point – Searching by name for element type and text note type – Searching using a negated category filter... Read more →

Slow, Slower Still and Faster Filtering

Today I discuss (once again) an important performance aspect of Revit element filtering, a Python script for tagging JPEG images with EXIF data, prompted by a recent ski tour, and three other interesting topics that caught my eye – Slow, slower still and faster filtering – Python JPEG EXIT filename tagging – TED talks and population growth – Objective reality does not exist – Artificial intelligence judge... Read more →

Aborting Filtered Element Collection

I just discovered an interesting and not completely obvious aspect of using a filtered element collector in the Revit API discussion forum thread on aborting a long running filtered element collector. Question: I have really large models where I use an ElementIntersectsElementFilter that can take a long time to process, and sometimes I want to abort it in a graceful way. Is this possible? Read more →

pyRevit Keynote Manager and Becker Forge Blog

Today, I discuss a simple Revit API getting started question from StackOverflow, a new Forge blog and a request for feedback on the keynote manager beta – Retrieving a wall type for creating a wall – CAD Becker Forge blog – pyRevit keynote manager beta... 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 →

Using an Intersection Filter for Linked Elements

Intersecting elements has always been a hot topic, cf. various previous discussions on 3D Booleans, cutting and joining elements; intersecting with elements in a linked file is even more challenging. Happily, the Revit API provides tools to support that as well – Intersecting linked elements with current project ones – Retrieving rebars intersecting a structural element... Read more →

Efficient and Elegant Code

I remain busy, mainly in the Revit API discussion forum. Here are three recent samples dealing with pretty generic questions – Efficiency and elegance in simple code – Pushing wall type to doors... Read more →

Reference Intersector and Deleting Reference Planes

We already looked at deleting unnamed non-hosting reference planes back in 2012 and 2014. Some things have changed since then, and the old code requires fixing and updating. Other interesting topics also want to be mentioned – Embodyment workshop – Bös Fulen mountain hike – Using ReferenceIntersector to place lighting fixture on ceiling face – Reformat stable representation string for dimensioning – Deleting unnamed non-hosting reference planes updated... Read more →

Forge Tutorials and Filtering for a Parameter Value

Today, let's revisit the topic of filtering for a parameter value, and mention the updated Forge tutorials – Learning Forge tutorials – Filtering for a specific parameter value – Filtered element collector optimisation... Read more →

FilterRule Use and Retrieving Exterior Walls

Today, we revisit the interesting and generic question on retrieving all exterior walls. That may be easy in a perfect and complete model. However, it raises some challenges in an incomplete BIM – Retrieving all exterior walls – Several possible approaches – Using a computational geometry approach – Manually adding the huge surrounding room – Encapsulate transactions and roll back instead of deleting – Determining model extents via wall bounding box – Implementing the huge surrounding room approach – Retrieving family instances satisfying a filter rule... Read more →

Getting All Parameter Values

How to export all the Revit data to an external database? It is very simple to extract all the parameter data. Let's implement a solution to do so – Existing sample implementations – Black box input – Choices for the output and its structure – Retrieve parameter values from an element – FilterCategoryRule versus category filters – Category description extension method – Retrieve parameter data for all elements of given categories – External command Execute mainline – Sample run results – Download... Read more →

Parameters, Walls and Driving Revit via WCF Service

Exciting news from Russia and some mundane updates on other repetitive topics – Driving Revit from a modeless context via a WCF service – Room walls' directions – Retrieving all exterior walls – Getting and setting a shared parameter value... Read more →

How to use FilterCategoryRule

@CaptainDan raised a very pertinent question in the discussion forum on using FilterCategoryRule in the Revit API that led to some discussion and clarification with the development team: I have three questions regarding the filter rule represented by this class... Read more →

Bounding Box Filter is Always Axis Aligned

This is pretty obvious, once you think about it, and apparently worth pointing out anyway: The outline defining a bounding box filter is always aligned with the cardinal axes – Rotating Min and Max distorts the box – Rotate target elements or use a solid filter... Read more →

Using Intersection Filter with Linked File

We recently discussed filtering for intersecting elements. Here is a closely related issue with an additional twist – Determining elements intersecting mass in a linked file – Coding suggestions and transformations – Solution by applying transformations... Read more →

Create 2D Arc and Filter for Intersecting Elements

Several questions on filtering for intersecting elements came up recently. It is pretty easy as long as a bounding box can be used. However, the bounding box is generally aligned with the cardinal X, Y and Z axes. If the containing volume of interest is not, too many elements may be selected – Family instances in a diagonal room – Conduits intersecting a junction box – Generate 2D arc from radius, start and end points... Read more →

Efficiently Retrieve Crop Box for Given View

Konrads Samulis shared a very nice solution to retrieve the crop box for a given view using a highly efficient parameter filter in his comment on rotating a plan view. In digging up this old thread, I found something quite curious in the API in 18.1, that I'm not sure was there before. The method of using a temporary transaction (with rollback) to find the element id of the crop box was taking a very long time on a large model, so I did a bit of digging to see how I could improve it. I noticed that in the built-in parameter ID_PARAM of the crop box contains the element id of the view it's in. E.g., the crop box 'points' to the id of the view it is in using ID_PARAM... Read more →

Automatic Wall Creation

Alexander Ignatovich shares an exceedingly elegant solution for automatic wall creation, illustrating a number of important concepts and implementing the following functionality very succinctly indeed – Retrieve all the cube family instances – Retrieve their height parameter value – Retrieve their solids making use of the .NET yield operator – Extract their horizontal outline contours using an ExtrusionAnalyzer – Create walls along each contour curve segment – Place a door family instance at the midpoint of each wall... Read more →

Purge and Detecting an Empty View

One topic that keeps cropping up is how to purge different kinds of Revit database elements – Purge – Detecting empty views – JavaScript debugging tips – Collection from the past... Read more →

Curtain Wall Panel Geometry with Basic Wall Panel

A quick geometrical question on retrieving geometry from a basic wall being used as a panel in a curtain wall. I am struggling to retrieve the geometry data from a curtain wall that contains a Basic wall in one of the curtain wall panels. My example curtain wall has two panels. With one of the panels, a basic wall type is associated. I need to get the geometry data (i.e., the faces) for the entire curtain wall. When I reach the second panel in my code, the SymbolGeometry contains zero objects, so my code cannot retrieve any geometry for it... Read more →

ExtentElem and Square Face Dimensioning References

Alexander Ignatovich answered several interesting questions in the Revit API discussion forum – The ExtentElem and duplicating legend components – Obtaining generic model square face references for dimensioning – Preparing family with reference planes for dimensioning – Creating a line perpendicular to another... Read more →

FindInserts Determines Void Instances Cutting Floor

Here is another brilliant and super succinct solution provided by Fair59, answering the Revit API discussion forum thread on how to get cutting void instances in the floor using the HostObject FindInserts method – Question: I have a floor on which a family instance is inserted on the face of the floor (the instance host is also the floor). I checked in the family the "Cut with Void When Loaded" parameter, so that the void is created in the floor. Now, I want to retrieve all the instances that create voids in the floor... Read more →

Retrieving Elements Visible in View

Minho re-opened the Revit API discussion forum thread on getting the ElementId of all visible entities in a viewport, providing a good opportunity to mention Colin Stark's answer to the StackOverflow thread on determining whether a FamilyInstance is visible in a View. Question: I am looking for code to get the ElementIds of all entities inside a viewport. A viewport is a region of a big view plan... Read more →

Forgify

I am officially taking time off right now, but still jumping in here and there anyway, e.g. in an urgent case to reduce the RVT model file size before passing it into the Forge translator – RvtForgify – Forge read-write – Forge in an Enterprise Service Bus... Read more →