Revit Get Point(X,Y,Z) from Cad

Question

I'm trying to get some (XY) coordinates points and rotation from an imported CAD inside Revit , but it only works right if the CAD file was never moved/rotated , this means that the Revit API get the internal coordinates of the CAD regardless of the CAD position in Revit.

now when i try the same exercise but with "Dynamo" the coordinates are right even if the CAD was moved/ Rotated

So how to make this right?

        GeometryElement geoElement = cad.get_Geometry(new Options());

        foreach (GeometryObject geoObject in geoElement)
        {
            GeometryInstance instance = geoObject as GeometryInstance;
            if (null != instance)
            {
                foreach (GeometryObject instObj in instance.SymbolGeometry)
                {
                    if (instObj is GeometryInstance) 
                    {
                        GeometryInstance gi_block = instObj as GeometryInstance;
                        Transform transform = gi_block.Transform;

                        XYZ origin =  transform.Origin; // coordinates
                        TaskDialog.Show("xx", origin.ToString());

                        XYZ vectorTran = transform.OfVector(transform.BasisX.Normalize());
                        double rot = transform.BasisX.AngleOnPlaneTo(vectorTran, transform.BasisZ.Normalize()); // angle in radians

                    }
                }
            }
        }

Answer 1

Maybe Dynamo is automatically adjusting for the Revit project location, rotation to north, and other global coordinate transformation settings.

The discussion of Real-World Concrete Corner Coordinates includes a description of Transforming Revit Model Coordinates to the Real World that you might be able to apply.

Check out the resulting Structural Concrete Setout Point Add-in , now alive on GitHub in the SetoutPoints repository .

Answer 2

You should probably first of all explore the ProjectLocation associated with your import instance. You can use RevitLookup to do so.