topic Re: problem: Dimension for column in Revit API Forum

problem: Dimension for column

Anonymous — Tue, 13 Aug 2019 02:57:58 GMT

Hi guy !

I am writing a code that automatically dimension column. I have a column not intersect to anything. My code is complete when place the default column , but when I use the spacebar to rotate the column, the dimension does not show up (rotate the column back to the original, then the dimension will appear). Please see the video below to get a better understanding of my problem.

Re: problem: Dimension for column

yimin.chenTW — Wed, 14 Aug 2019 13:38:26 GMT

Hi @Anonymous ,

The video you posted is not available now.

Would you mind uploading it again?

Re: problem: Dimension for column

BobbyC.Jones — Wed, 14 Aug 2019 15:41:00 GMT

The geometry retrieved from instance.SymbolGeometry is "in the local coordinate space of the symbol", as stated in the docs. You will need perform some transforms, using the Transform returned from Instance.GetTransform(), in your vector comparisons.

Re: problem: Dimension for column

Anonymous — Thu, 15 Aug 2019 00:52:57 GMT

Hi @yimin.chenTW

I fixed it, can you watch it?

Re: problem: Dimension for column

Anonymous — Thu, 15 Aug 2019 03:50:06 GMT

HI @BobbyC.Jones !

Would you please give me detailed instructions? Thank you !

Re: problem: Dimension for column

BobbyC.Jones — Thu, 15 Aug 2019 13:31:28 GMT

    var instanceTransform = columnFamilyInstance.GetTransform();

    foreach (Face face in solidCol.Faces)
    {
        var normal = face.ComputeNormal(uv);
        var instanceNormal = instanceTransform.OfVector(normal);

        if (instanceNormal.IsAlmostEqualTo(XYZ.BasisY) || instanceNormal.Negate().IsAlmostEqualTo(XYZ.BasisY))
        {
            referenceArrayX.Append(face.Reference);
        }
        //...
    }

Re: problem: Dimension for column

yimin.chenTW — Thu, 15 Aug 2019 14:09:21 GMT

Hi @Anonymous

it's available now.

Re: problem: Dimension for column

Anonymous — Fri, 16 Aug 2019 01:48:24 GMT

I was successful. Thank you very much @BobbyC.Jones

Re: problem: Dimension for column

yimin.chenTW — Sat, 17 Aug 2019 06:41:24 GMT

@Anonymous good to see you got your answer from @BobbyC.Jones .

Here's another approach for what you want, just for your reference.

foreach(Face f in solid.Faces)
{
     if (f.ComputeNormal(new UV(0.5,0.5)).IsAlmostEqualTo(XYZ.BasisZ.Negate())) //get bottom face
     {
         foreach(EdgeArray edgeArr in f.EdgeLoops)
         {
             foreach(Edge edge in edgeArr)
             {
                 ReferenceArray refArray = new ReferenceArray();
                 refArray.Append(edge.GetEndPointReference(0));
                 refArray.Append(edge.GetEndPointReference(1));
                 XYZ offsetVec = instanceTransform.OfVector(edge.Evaluate(0.5)).Normalize();

                 XYZ p1 = instanceTransform.OfPoint(edge.Evaluate(0)) + offsetVec;
                 XYZ p2 = instanceTransform.OfPoint(edge.Evaluate(1)) + offsetVec;
                 Line line = Line.CreateBound(p1, p2);
                 doc.Create.NewDimension(doc.ActiveView,line , refArray);
              }
          }
     }
}