topic Re: Revit 2020 API BasePoint - Unable to access parameter info of linked models in Revit API Forum

Revit 2020 API BasePoint - Unable to access parameter info of linked models.

Dan_Mapes — Fri, 28 Feb 2020 16:21:08 GMT

We have been using a python script to get the BasePoint info from all linked models in a project. We use this to create a project dashboard showing all linked models and their associated location information. In 2020 this stopped working and I need to figure out a solution.

In the 2020 API we cannot access the Built in parameters for BasePoint when using GetLinkedDocument()

Is there another method to get this info from a linked model in the 2020API?

linkDocuments = [] for linkType in linkTypes: if DB.RevitLinkType.IsLoaded(doc, linkType.Id): linkDoc = None for li in linkInstances: if li.GetTypeId().IntegerValue == linkType.Id.IntegerValue: linkDoc = li.GetLinkDocument() if linkDoc is not None: linkDocuments.append(linkDoc) basepoints = DB.FilteredElementCollector(linkDoc)\ .OfClass(DB.BasePoint) basePoint = None surveyPoint = None # print(modelName) for e in basepoints: if e.IsShared: surveyPoint = e break for e in basepoints: if not e.IsShared: if e.get_Parameter(DB.BuiltInParameter.BASEPOINT_ANGLETON_PARAM) is not None: basePoint = e surveyPointNS, surveyPointEW, surveyPointElev = ( round(surveyPoint.get_Parameter( DB.BuiltInParameter.BASEPOINT_NORTHSOUTH_PARAM).AsDouble(), 3), round(surveyPoint.get_Parameter( DB.BuiltInParameter.BASEPOINT_EASTWEST_PARAM).AsDouble(), 3), round(surveyPoint.get_Parameter( DB.BuiltInParameter.BASEPOINT_ELEVATION_PARAM).AsDouble(), 3) )

Re: Revit 2020 API BasePoint - Unable to access parameter info of linked models

Anonymous — Fri, 13 Mar 2020 03:43:17 GMT

I have same issue with you. Did you solve it?

Re: Revit 2020 API BasePoint - Unable to access parameter info of linked models

Dan_Mapes — Wed, 27 May 2020 13:51:50 GMT

No I still have not found a solution to this.

Re: Revit 2020 API BasePoint - Unable to access parameter info of linked models

Yien_Chao — Wed, 27 May 2020 15:21:58 GMT

try to use this instead:

.Basepoint[0]

Or better :

BuiltInCategory.OST_ProjectBasePoint

BuiltInCategory.OST_SharedBasePoint

if you use .Basepoint, you will get a list of points (project and shared)

Re: Revit 2020 API BasePoint - Unable to access parameter info of linked models

RPTHOMAS108 — Wed, 27 May 2020 16:03:23 GMT

You can use static methods:

BasePoint.GetProjectBasePoint(Document)

BasePoint.GetSurveyPoint(Document)

BasePoint class also has the following related properties:

Position

SharedPosition

IsShared

What you'll find is that instances of BasePoint with category OST_ProjectBasePoint do not have the following parameters attached if they are from a linked document:

BuiltInParameter.BASEPOINT_NORTHSOUTH_PARAM

BuiltInParameter.BASEPOINT_EASTWEST_PARAM

BuiltInParameter.BASEPOINT_ELEVATION_PARAM

BuiltInParameter.BASEPOINT_ANGLETON_PARAM

I don't know the reason for that but I also don't know what bearing these things have on how the link is orientated in the host project? You could have an infinite number of positions for project base point in a link project but still achieve the same relative position between the link and it's host. Maybe it is important for IFC, I don't know. I've worked on project where I set project north 180 degrees opposite from the architect's project north (as that was the elevation more relevant to us) in the end the links still came together in the correct position and orientation using shared coordinates. Also important to remember that there is an active site and same link type can be placed in multiple alternate locations, so I don't know how that relates to your intended task.

Re: Revit 2020 API BasePoint - Unable to access parameter info of linked models

TripleM-Dev.net — Wed, 27 May 2020 16:12:10 GMT

In Revit 2020 a third BasePoint exists: BuiltinCategory.OST_IOS_GeoSite in addition to the 2 others categories mentioned by @Yien_Chao

This third point, IsShared property = False, and doesn't have the BuiltinParameter.BASEPOINT_ANGLETON_PARAM.

There isn't a break in the second loop, so the retrieved BasePoint variable is overwritten by the third basepoint.

Stop the loop as soon as the BasePoint is retrieved OR compare against the BuiltinCategory value

- Michel

Re: Revit 2020 API BasePoint - Unable to access parameter info of linked models

moj — Wed, 28 Oct 2020 10:04:33 GMT

Did anyone solve this?

Re: Revit 2020 API BasePoint - Unable to access parameter info of linked models

moj — Tue, 03 Nov 2020 13:22:49 GMT

I solved it this way:

// Get the current project location ProjectLocation currentLocation = m_selectedLinkedDocument.ActiveProjectLocation; // Create a 0,0,0 origin XYZ origin = new XYZ(); // Get the project position ProjectPosition projectPosition = currentLocation.GetProjectPosition(origin); // Get the Project Base Point parameters double northSouth = projectPosition.NorthSouth; double eastWest = projectPosition.EastWest; double elevation = projectPosition.Elevation; double trueNorth = projectPosition.Angle;