triangulated mullion vertices not correct

[Anonymous]

Hello,

After the triangulation of the mullions in my project, it seems that the vertices Z isn't right. It gives me an value to high ( like 60 meters to high ) or to low ( like 150 meters below 0 ). I am using this code to get the vertices, can someone help me getting the right values? Walls and floors are going correctly by the code, but mullions aren't.

triangle.get_Vertex(x) gives us an very odd Z value.

if(wall.Walltype.Kind == WallKind.Curtain)
{
 // Loop mullions
 foreach (ElementId mullionId in this.curtainWall.CurtainGrid.GetMullionIds())
 {
  // Get mullion
  Element mullion = document.GetElement(mullionId);

  // Get element geometry
  Options options = new Options();
  GeometryElement geometryElement = element.get_Geometry(options);

  // Loop geometry objects
         foreach (GeometryObject geometryObject in geometryElement)
         {
   // Cast as solid
   Solid solid = geometryObject as Solid;
   
   // Loops solids
              foreach (Solid solid in solids)
              {
                  // Loop faces
                  foreach (Face geomFace in solid.Faces)
                  {
                       if(geomFace.Triangulate().Vertices.Count < 3)
                       {
                           continue;
                       }

                       Mesh mesh = geomFace.Triangulate();

                       for (int t = 0; t < mesh.NumTriangles; t++)
                       {
                           //Create new face
                           PartFace face = new PartFace();

                           MeshTriangle triangle = mesh.get_Triangle(t);

                           // Add coordinate to face
                           face.Coordinates.Add(triangle.get_Vertex(0) / feet);
                           face.Coordinates.Add(triangle.get_Vertex(1) / feet);
                           face.Coordinates.Add(triangle.get_Vertex(2) / feet);

                           // Add face to list
                           polygon.Faces.Add(face);
                       }
                  }
              }
  	   }
        }
}

With kind regards,

Guus

[matthew_taylor]

Hi @Anonymous,

There was a recent discussion on this that may explain a lot:

https://forums.autodesk.com/t5/revit-api-forum/how-to-get-a-solids-location-in-the-project/m-p/6860193#U6860193

Cheers,

-Matt

[Anonymous]

Hello Matt,

We tried to use the same approach, however our bounding box seems to be really far away. As you can see in the figure below ( exported the coordinates to matlab) this "doorframe made out of mullions" isn't axactly right. the strange thing is that the bounding box is actually the same coordinates as the element.get_geometry(). visible in the 3D view is that it is 2m high, 900 mm width and 114 mm thick. and positioned on the first floor ( 0 - 2800 mm )

 

is there another method for obtaining the geometry of mullions?

with kind regards,

Guus

[matthew_taylor]

Hi @Anonymous,

I'm no expert in this, but I'm going to throw you a few ideas:

• The Revit API uses decimal feet for Length. You divide by 'feet'. Consider testing everything in decimal feet, then working out any conversions afterwards.
• Your geometry options don't specify much. Have you adjusted these to if it affects your results? (I'm particularly thinking of the detail level OR view here.)
• .Triangulate has an overload that accepts a levelOfDetail value.
• Triangulate notes results as 'approximate'. I'm guessing that this is expected, but unlikely to cause such a large issue.

While this is vastly out of date, it may help:

http://thebuildingcoder.typepad.com/blog/2009/03/transform-instance-coordinates.html

(As noted in that blog post, have you looked at the ElementViewer SDK example?)

Cheers,

-Matt