topic Re: Finding nearest level in Revit API Forum

Finding nearest level

Anonymous — Thu, 29 Dec 2016 18:05:02 GMT

Hello everybody!

I am trying to find the nearest lower (and upper) level from a point.

I have been able to fint the nearest element (eg. a floor) using the next code:

ReferenceIntersector refIntersector = new ReferenceIntersector(view3D);
ReferenceWithContext referenceWithContext = refIntersector.FindNearest(elemPoint, new XYZ(0,0,-1));
Reference reference = referenceWithContext.GetReference();
XYZ lowerLevel = reference.GlobalPoint;

It finds the nearest element, but, unortunately, id does not find the nearest level.

I have tried using also it:

ElementClassFilter filter = new ElementClassFilter(typeof(Level));
ReferenceIntersector refIntersector = new ReferenceIntersector(filter, FindReferenceTarget.All,view3D);

but it does not work....

Any idea??

Thanks in advance!

Chema

Re: Finding nearest level

Anonymous — Fri, 30 Dec 2016 02:22:08 GMT

Dear Chema,

Try this one.

      private Level getNearestBelowLevel(double _Zvaue)
        {
            return new FilteredElementCollector(doc).OfClass(typeof(Level)).Cast<Level>().Where(x => x.Elevation < _Zvaue).OrderByDescending(x => x.Elevation).FirstOrDefault();
        }
        private Level getNearestUpperLevel(double _Zvaue)
        {
            return new FilteredElementCollector(doc).OfClass(typeof(Level)).Cast<Level>().Where(x => x.Elevation > _Zvaue).OrderBy(x => x.Elevation).FirstOrDefault();
        }

Note: In case of Shared co-ordinate Some time also use x.ProjectElevation instead of x.Elevation.

Re: Finding nearest level

Anonymous — Fri, 30 Dec 2016 18:13:18 GMT

Totally effective and much simpler!!!

Thanks So much!!!

Chema

Re: Finding nearest level

joshua.lumley — Thu, 28 Mar 2019 00:51:19 GMT

Thank you...so simple it is miraculous.

Re: Finding nearest level

yoniblum — Wed, 23 Jun 2021 21:36:12 GMT

Is there an equivalent function to do this in python, where the input is the z-coordinate and the output is the nearest above level?