Get cutting void instances in the floor

[minet.axel]

Hello,

I have a floor on which a familyinstance is inserted on the face of the floor (the instance to host: the floor). I checked in the family the "Cut with Void When Loaded" parameter so that the void created on the floor. I want to retrieve the instance that creates the void in the floor.

I did some research, and found this link: http: //thebuildingcoder.typepad.com/blog/2011/06/boolean-operations-and-instancevoidcututils.html But when I use InstanceVoidCutUtils.GetCuttingVoidInstances(element) returns an empty list.

[jeremytammik]

This discussion should provide hints to all you need:

http://thebuildingcoder.typepad.com/blog/2015/07/intersect-solid-filter-avf-and-directshape-for-debu...

I hope it helps.

Please let us know how it goes and how you end up resolving this.

Thank you!

Cheers,

Jeremy

[minet.axel]

lsdlfs

I want to deduce the voids in the floor. But when I use ElementIntersectsElementFilter or ElementIntersectsSolidFilter, I do not have the expected result (no elements intersect).

First case : area = 607.558m2 and Volume = 243.023m3

Second case : area = 607.558m2 and Volume = 243.023m3

 Family parameter

 

 FamilyInstance cutting

Solid solid = floor.get_Geometry(new Options())
.OfType<Solid>()
.Where<Solid>(s => null != s && !s.Edges.IsEmpty)
.FirstOrDefault();

FilteredElementCollector intersectingInstances = new FilteredElementCollector(doc)
.OfClass(typeof(FamilyInstance))
.WherePasses(new ElementIntersectsSolidFilter(solid));

int n1 = intersectingInstances.Count<Element>();

intersectingInstances = new FilteredElementCollector(doc)
.OfClass(typeof(FamilyInstance))
.WherePasses(new ElementIntersectsElementFilter(floor));

int n = intersectingInstances.Count<Element>();

Here "n" and "n1" are equal to 0.

[FAIR59 · Accepted solution]

try using

                List<ElementId> intersectingInstanceIds = floor.FindInserts(false,false,false,true).ToList();

[minet.axel]

I have done some tests and here are my returns.

FindInserts returns FI_1 even if its host (Level 3) is not the floor. Its good.I think we can say that the problem is solved.

Thank you FAIR59 ;).

[jeremytammik]

Many thanks yet again to Fair59 for his accurate and succinct solution, and to Axel for raising the issue and confirming it!

Once again, I think this needs to be preserved and easily found, so I edited and shared on The Building Coder:

http://thebuildingcoder.typepad.com/blog/2017/06/findinserts-determines-void-instances-cutting-a-flo...

Cheers,

Jeremy