problem: Dimension for column

[Anonymous]

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.

[yimin.chenTW]

Hi @Anonymous ,

The video you posted is not available now.

Would you mind uploading it again?

[BobbyC.Jones · Accepted solution]

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.

[Anonymous]

Hi @yimin.chenTW 

I fixed it, can you watch it?

[Anonymous]

HI @BobbyC.Jones !

Would you please give me detailed instructions? Thank you !

[BobbyC.Jones · Accepted solution]

    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);
        }
        //...
    }

[yimin.chenTW]

Hi @Anonymous 

it's available now.

[Anonymous]

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

[yimin.chenTW]

@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);
              }
          }
     }
}