topic How to get the centroid of a wall? in Revit API Forum

How to get the centroid of a wall?

Anonymous — Fri, 21 Jul 2017 13:38:26 GMT

Can somebody help me with this?

the workflow is ..

1. pick a wall - done

2. get the centroid of a wall

3. create point to the centroid of the wall

Re: How to get the centroid of a wall?

matthew_taylor — Mon, 24 Jul 2017 17:54:59 GMT

This may help:

http://thebuildingcoder.typepad.com/blog/2015/06/dynamo-centroid-volume-calculation-migration-blitz.html

(It's not a Dynamo macro!)

Re: How to get the centroid of a wall?

Anonymous — Wed, 02 Aug 2017 07:00:52 GMT

Hello napa2017

I think the centeriod of a wall is the (BottomFace.origin+TopFace.origin)/2.

Sure,the wall must be regular.

Hope is good for you


        XYZ GetCenteriod(Solid solid)
        {
            XYZ BottomOrigin = null;
            XYZ TopOrigin = null;
            XYZ CenteriodPoint = null;
            string Message = null;
            PlanarFace pf = null;
            foreach (Face face in solid.Faces)
            {
                pf = face as PlanarFace;
                if (null != pf)
                {
                    if (Math.Abs(pf.FaceNormal.X) < 0.01 && Math.Abs(pf.FaceNormal.Y) < 0.01 && pf.FaceNormal.Z < 0)//Face.FaceNormal    Judge  TopFace or BottomFace
                    {
                        BottomOrigin = pf.Origin;
                        Message += BottomOrigin.ToString()+"BottomFace \n";
                        continue;
                    }
                    if (Math.Abs(pf.FaceNormal.X) < 0.01 && Math.Abs(pf.FaceNormal.Y) < 0.01 && pf.FaceNormal.Z > 0)//Face.FaceNormal     Judge  TopFace or BottomFace
                    {
                        TopOrigin = pf.Origin;
                        Message += TopOrigin.ToString() + "TopFace \n";
                        continue;
                    }
                }
            }
            CenteriodPoint = (TopOrigin + BottomOrigin) / 2;
            Message += CenterPoint.ToString()+"Centeriod \n";
            TaskDialog.Show("CenteriodPoint", Message);
            return CenteriodPoint;
        }

Re: How to get the centroid of a wall?

FAIR59 — Thu, 10 Aug 2017 22:21:30 GMT

the Solid class has a method ComputeCentroid().

So from the wall Geometry you can get the Centroid


			Options opt = new Options();
			opt.DetailLevel = ViewDetailLevel.Coarse;
			Solid wallSolid = null;
			foreach (GeometryObject obj in wall.get_Geometry(opt))
			{
				Solid s = obj as Solid;
				if (s!= null)
				{
					wallSolid = s;
					break;
				}
			}
			if (wallSolid!=null)
			{
				XYZ centre = wallSolid.ComputeCentroid();
			}