How to get the center point of the bounding box of all elements?

[uyoufu]

Hello，xBIM team!
Is there a way to calculate the bounding box of all elements and get the center point of them?

[martin1cerny]

Yes, this is possible. You need to use our geometry engine (Xbim.Geometry nuget package) to process all the geometry. Then you will be able to get all the bounding boxes of all elements.

[uyoufu]

@martin1cerny Thanks! I have isntalled the package but I can't find a document to Introduce how to use，could you show me a example code?

[martin1cerny]

You can start with this code:

Xbim3DModelContext context = new Xbim3DModelContext(model);
context.CreateContext();

var elements = model.Instances.OfType<IIfcElement>();
foreach (var element in elements)
{
    var productShapes = context.ShapeInstancesOf(element);
    var bBox = productShapes
        .Select(s => XbimRect3D.TransformBy(s.BoundingBox, s.Transformation))
        .Aggregate(XbimRect3D.Empty, (last, current) => { 
            last.Union(current); 
            return last; 
        });
}

[uyoufu]

@martin1cerny Wow, it works! Thanks very much!
The type of BoundingBox is XbimRect3D , and the method Centroid() in XbimRect3D is just what I need.