revit: cutback parameters not set for framing on receive

[dtnaughton]

Prerequisites

• I read the contribution guidelines
• I checked the documentation and found no answer.
• I checked existing issues and found no similar issue.
• I checked the community forum for related discussions and found no answer.
• I'm reporting the issue to the correct repository (see also speckle-server, speckle-sharp, specklepy, speckle-docs, and others)

What package are you referring to?

speckle-sharp (revit)

Describe the bug

• START_JOIN_CUTBACK and END_JOIN_CUTBACK parameters are not being set on receive into Revit for framing.

To Reproduce

1. Send beam (with valid values for cutback parameters) and columns to Speckle - note the START_JOIN_CUTBACK and END_JOIN_CUTBACK parameters do get sent
2. Receive objects into a new model, noting that cutback parameters get set to default values (0mm for beams and 12.7mm for bracing iirc).

Expected behavior

Cutback parameter values should be set.

Screenshots

System Info

If applicable, please fill in the below details - they help a lot!

Desktop (please complete the following information):

• OS: Windows 10

Failure Logs

Additional context

I did some extra scoping of the issue and thought I'd share what insight I have:

• The parameters on the beam that is created (fetched here) has parameters matching those created for a beam that is set to disallow joins, i.e. missing the START_JOIN_CUTBACK and END_JOIN_CUTBACK parameters (plus two others not relevant to this issue).
• My initial thought was that applying allow join is done somewhere later in the operation and therefore the parameter is not yet accessible on the element during the conversion method.
• However, I can access/set the cutback parameters on the object explicitly in the conversion method utilizing TrySetParam on the explicit parameter BuiltInParameter.START_JOIN_CUTBACK.

Proposed Solution (if any)

• Simple fix would just be to try setting these parameters on the beam/brace conversion methods separate to the parameters that are set in the Utils method. I added a quickfix to Arup's repo for this to support a project workflow in the interim to a more robust solution.
• Alternatively a better understanding of why these parameters don't surface in the Utils method.

Optional: Affected Projects

[jsdbroughton]

https://spockle.atlassian.net/browse/CNX-8666