Watch 3D Unexpected Value at Forma

[Tlgarck]

Hello,

I created a solid model with Dynamo on an element/surface selected from Forma. And I want to import this model into Forma. I think I need to set Watch 3D as output. When I do this I get an Unexpected Value error. I would be happy if you help. Thank you.

[havard.hoiby]

 Hi @Tlgarck 🙂

We have had some issues with the Watch3D node for some versions of Dynamo, which are you using?

Could you try a simpler graph? Like the attached `Cubeoid.ByLengths` ? Does it still fail?

A more robust approach is to use `VolumeMesh.ByMeshOrSolid` and `Integrate.ByRepresentations` inplace of the `Watch3D` node 🙂 

I was not able to reproduce your exact issue, could you show the element that you selected to get to the result in the 4.png image? 

-Håvard

[Tlgarck]

Hi @havard.hoiby 

Thank you for reply.

I was able to create a simple cube and see it in Watch3D. But I can't transfer this model to Forma.
I just select Output for the Watch3D node.
I have Dynamo 2.19 and DynamaFormaBeta for 2.x -- 4.1.0 installed.

[havard.hoiby]

Hi @Tlgarck .

It looks like the DynamoFormaBeta for 2.x package is depending on a library where the version is not well specified. And that your system contains a version of System.Text.Json which is not compatible with the one that our code assumes. This causes the `Does not have an implementation` error. I think this is a programming error on our end and I will try to remove this library, as I already had planned to do so. 

I believe a workaround for you would be to try to use Dynamo 3.x and the DynamoFormaBeta package. You can download the Sandbox version from here: https://dynamobuilds.com/

I will update you if I'm successful in making a new version of the DynamoFormaBeta for 2.x version that will run on your system. 

[Tlgarck]

Hi @havard.hoiby 

I installed Dynamo Sandbox 3.x. How will I connect it with Forma and Revit? As a result, when I run it, the Revit section does not appear because it does not work in connection with Revit. Dynamo, which I opened from the Revit interface, seems to be stuck in the old version 2.19. I did not fully understand this part? Thanks again.

Also, if you have a source video, powerpoint etc. that you can share on this subject, I would be happy.

Thank you. 😉

[havard.hoiby]

Hi again 🙂

Using Sandbox will only allow for a connection between Forma and Dynamo. Not Forma + Dynamo + Revit. So the absence of the Revit section is expected. Revit comes with a particular version of Dynamo and you should not try to upgrade this version. That will likely break other things. 

Zach Kron and I did a few intro videos here: https://www.youtube.com/playlist?list=PLY-ggSrSwbZqlbQG1i45bpT8clCJp08wD 🙂 Is this what you are looking for?

[aparajit_pratap · Accepted solution]

@Tlgarck to use Dynamo 3.x in Revit, you'll need to install Revit 2025. If you want to test Forma in Dynamo without Revit, just use Dynamo Sandbox 3.x, which you downloaded from https://dynamobuilds.com/. In both cases, Dynamo in Revit and Dynamo Sandbox, you'll need to install the DynamoFormaBeta package.

[Tlgarck]

Hi all,

Today my problem is solved. I tested other pc. And I used Revit 2025 and Dynamo 3.x . I installed DynamoFormaBeta package and I saw in Dynamo.
Only When I run Dynamo in Forma , the model does not form in the same place.
Model is forms in 0,0,0 point.
This is a prolem ?

Thank you.

[aparajit_pratap]

@Tlgarck this issue is now fixed in DynamoFormaBeta for 2.x package version 4.1.1.

[Tlgarck · Accepted solution]

Thank you so much, porblem solved  I understand your say 😉