Hello,
We're developing an MR application (with Microsoft's HoloLens) that allows for adding 3D annotations to an architectural model. These annotations are attached to particular elements in the building (such as walls or doors) and as such, have a specific position within them, as well as informative text. To do this, we are using an IFC file and modifying it using the xBim library. The annotation itself is represented with an instance of the IfcAnnotation class with an IfcShapeRepresentation (IfcBoundingBox) for geometry.
This annotation is correctly represented when opening the IFC file in xBimXplorer. However, when importing the IFC into Revit nothing is visible.
We have little Revit know-how, so there might something we've overlooked. Is the same behavior from xBimXplorer possible in Revit? We have full control over how the annotation is added to the IFC file, so we can change the classes used if necessary. We include the IFC file in question as an attachment.
We are using Revit 2019 in Windows 10.
Thank you in advance!
The annotation correctly represented as a box
Hi @Anonymous
I see that you are a new visitor. Welcome to the Autodesk community!
It is interesting to note that your team is developing an MR application (with Microsoft's HoloLens) that allows for adding 3D annotations to an architectural model. I have seen annotation applications for 3d models in VRML web browsers like Cortona back in the early 2000's. It is good to note progress in this regard.
Coming back to your question, what is the IFC schema in XBim are using to establish this functionality? You mentioned that the IFC file is not visible in Revit 2019, can you confirm if you are using the latest exporter
and also on the latest updates for Revit 2019
Thanks for the IFC file, Can you also share a journal recording the export in Revit?
Looking forward to hearing from you!
Thanks,
Viveka CD
Designated Specialist - AEC, AR/VR Research
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@Anonymous
Tested this in Revit 2019, the annotation box is missing.
What is the native software that you've used to extract the IFC?
Regards,
Viveka CD
Designated Specialist - AEC, AR/VR Research
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Hi @Viveka_CD,
Thank you for your reply. We are using IFC 2x3 and we obtained the IFC file using Revit itself. We are currently using version 19.0.1.1, but I've contacted our systems' administrator to update the version, as soon as possible. As I mentioned, we do not have a lot of Revit expertise, how could we obtain the journal recording you mentioned?
Thanks again,
Carlos
Hi @Anonymous
Please see how to extract a journal and a screencast to describe what you are experiencing
Also, see: Revit - Collecting and sending diagnostic data to Autodesk Technical Support
As for the next steps, once we have your files, I will continue to make progress on your case.
Thanks,
Viveka CD
Designated Specialist - AEC, AR/VR Research
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@Anonymous wrote:
Hi @Viveka_CD,
Thank you for your reply. We are using IFC 2x3 and we obtained the IFC file using Revit itself. We are currently using version 19.0.1.1, but I've contacted our systems' administrator to update the version, as soon as possible. As I mentioned, we do not have a lot of Revit expertise, how could we obtain the journal recording you mentioned?
Thanks again,
Carlos
The question really is how did you create the 3d annotation and how did you place it in the IFC file?
Hi @ToanDN,
As I mentioned in the original question, we wrote a C# application using the xBim Library for adding the annotation.
We pieced together the code by rummaging through the xBim examples, as well as the buildingSmart pages.
I include function in that does the actual annotating for completeness:
static void AddAnnotation(IfcStore model, string objectGuid, string name, string description, double x, double y, double z)
{
double boxSize = 0.2;
var element = model.Instances.FirstOrDefault<IfcElement>(d => d.GlobalId == objectGuid);
using (var txn = model.BeginTransaction("Add Annotation " + name))
{
// Place the annotation relative to selected object
var pPlacement = model.Instances.New<IfcLocalPlacement>(pPlace =>
{
pPlace.PlacementRelTo = element.ObjectPlacement;
var placement = model.Instances.New<IfcAxis2Placement3D>();
pPlace.RelativePlacement = placement;
placement.Location = model.Instances.New<IfcCartesianPoint>(p => p.SetXYZ(x, y, z));
});
// model as box
var body = model.Instances.New<IfcBoundingBox>();
body.Corner = model.Instances.New<IfcCartesianPoint>(p => p.SetXYZ(-0.5 * boxSize, -0.5 * boxSize, -0.5 * boxSize));
var dim = new IfcPositiveLengthMeasure(boxSize);
body.XDim = dim;
body.YDim = dim;
body.ZDim = dim;
// Create a Definition shape to hold the geometry
var shape = model.Instances.New<IfcShapeRepresentation>();
var modelContext = model.Instances.OfType<IfcGeometricRepresentationContext>().FirstOrDefault();
shape.ContextOfItems = modelContext;
shape.RepresentationType = "BoundingBox";
shape.RepresentationIdentifier = "Body";
shape.Items.Add(body);
// Create a Product Definition and add the model geometry to the object
var rep = model.Instances.New<IfcProductDefinitionShape>();
rep.Representations.Add(shape);
var pAnnotation = model.Instances.New<IfcAnnotation>(r =>
{
r.GlobalId = IfcGloballyUniqueId.FromGuid(Guid.NewGuid());
r.Name = name;
r.Description = description;
r.ObjectPlacement = pPlacement;
});
pAnnotation.Representation = rep;
element.ContainedInStructure.First().RelatedElements.Add(pAnnotation);
// Commit changes
txn.Commit();
}
}
@Viveka_CD, I also include the journal files when exporting the IFC from our RVT file.
Best Regards,
Carlos
@Anonymous Awesome thanks for sending the journals.
Let me get some feedback from the IFC folks.
Thanks,
Viveka CD
Designated Specialist - AEC, AR/VR Research
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