ForgeTypeId and Units Revisited

We already discussed quite a few aspects of the Revit 2022 unit handling API and ForgeTypeId usage:

Here are some more related questions that came up since then:


Before diving into this topic, let us congratulate the China team in their celebration of the Dragon Boat festival today.

Dragon Boat festival

FixtureUnit ParameterType

David Becroft comes to the rescue again answering the Revit API discussion forum thread on how to convert ParameterType.FixtureUnit to ForgeTypeId

Question: I am trying to port some legacy code to Revit 2022 and I am running into the problem converting some ParameterType enum values to a ForgeTypeId.

FixtureUnit and Invalid (the result for ElementId parameters) are the most pressing ones.

There does not seem to be anything Fixture or Piping related in the SpecTypeId class that may apply. PipeDimension comes closest but is not, I think, the same? Plus, it also exists separately in the ParameterType enum which makes it unlikely that it got a double meaning in Revit 2022.

According to the release documentation there should be a deprecated method in the Parameter class that can help porting ParameterType enum values to ForgeTypeId objects, but Intellisense does not seem to be aware of the existence of such a method.

Answer: These methods are in SpecUtils, GetSpecTypeId(ParameterType) and GetParameterType(ForgeTypeId).

In place of ParameterType.FixtureUnit, you can use SpecTypeId.Number.

ParameterType.Invalid is equivalent to an empty, default-constructed ForgeTypeId, i.e. new ForgeTypeId().

Revit 2022 Unit Handling API in Dynamo

Konrad Sobon does a great job explaining how to deal with this in Dyname and Python in his discussion of handling the Revit 2022 unit changes.

String Values for Forge Units

The unit handling changes also affected some Forge apps:

RVT ForgeTypeId in Forge

This was discussed and resolved in the StackOverflow question on Autodesk Forge returning odd measurement data

I ended up implementing the method ListForgeTypeIds in The Building Coder samples to help resolve the issue.

I also shared this in the discussion on DisplayUnitType in Revit 2022.

Unit Conversion Without Knowing

In a related vein, how can you implement a unit conversion without knowing the internal Revit unit?

This question has been around since the beginnings of The Building Coder and was first addressed in blog post #11 on units in September 2008.

It came up again in the Revit API discussion forum thread on a unit conversion question:

Simply set the value that you are analysing to 1.0 manually through the user interface using your current display units.

Then, use RevitLookup to analyse what value V actually gets stored.

The ratio between those two values, i.e., V/1.0 == V, immediately provides the conversion factor from display unit to internal database unit (or v.v.).

How Will We Live Together?

Moving from Revit to the topic of architecture in general, at La Biennale di Venezia, the 17th International Architecture Exhibition is focussed on the theme of How will we live together?

We need a new spatial contract. In the context of widening political divides and growing economic inequalities, we call on architects to imagine spaces in which we can generously live together.

At the biennale, the German pavilion looks back from the future:

2038 is the name of the German Pavilion in the 17th International Architecture Exhibition at Biennale di Venezia. A look back from the future, which the curators envision as a world where many of today’s problems have been overcome. Digital technology makes it possible to visit the pavilion from anywhere in the world: